Bsi bs en 13785 2005 + a1 2008

4.2 Regulators for installations where the final regulator supplies a pressure specified in EN 437 The last regulator, which supplies a gas appliance for pressures specified by EN 437 s

General terms and definitions

3.1.1 regulator device which maintains a regulated pressure within preset limits, whatever the upstream pressure, rate and temperature The regulator can have fixed, variable or adjustable regulated pressure

The terminology given is that shown in Figure 1 The diagram is given as information; no other method is excluded

Licensed copy: Book Supply Bureau, Version correct as of 03/09/2011 07:06, (c) BSI

Figure 1 - Principal parts of a regulator

3.1.2 fixed regulator regulator whose regulated pressure is adjusted by the manufacturer and fixed and whose adjustment cannot be modified by the user

3.1.3 variable regulator regulator whose regulated pressure may be modified by the user with simple manipulation between two fixed limits

3.1.4 adjustable regulator regulator whose regulated pressure may only be modified by a competent person at the time of installation; it is then fixed

!connection system which allows the fitting of the regulator to the cylinder valve without a threaded connection and without using tools"

!3.1.6 tap (manual closing device) device for closing the gas flow which requires an intentional manual action (for example on a lever, a knob)"

!device allowing the automatic shut off of the gas flow, by simple disconnection of the regulator from the cylinder valve"

The valve is a crucial component of the regulation subassembly, ensuring a secure connection between the supply pressure section and the regulated pressure section of the regulator, particularly when the regulated pressure is equal to or exceeds the closing pressure.

Sealing any device arrangement, such as an adjuster, ensures that any interference likely to alter its setting results in the breaking of the device or sealing material, thereby making the interference noticeable.

The DN (nominal diameter) is a numerical designation that applies to all components within a pipework system, excluding those identified by their external diameter or thread size This whole number serves as a reference and is approximately related to the manufacturing dimensions of the components.

!3.1.11 freely rotating outlet connection integral outlet connection designed to fully rotate"

Terms and definitions concerning gas

Butane is a member of the third family of gases, characterized by a vapor pressure (p v) at 50 °C ranging from a minimum of 4.3 bar to a maximum of 7.5 bar, with an average volumetric mass in the gas phase of 2.4 kg/m³.

Propane is a third family gas mixture characterized by a vapor pressure (p v) ranging from 7.5 bar to 16 bar at 50 °C, with an average volumetric mass in the gas phase of 1.85 kg/m³.

LPG is a mixture of third family gases characterized by a vapor pressure of at least 4.3 bar and up to 16 bar at 50 °C, with an average volumetric mass in the gas phase of 2.12 kg/m³.

Terms and definitions concerning pressures

The values of pressures given in the text are to be considered as gauge pressure and are expressed in bar (bar) or millibar (mbar)

3.3.1 supply pressure p value of the gas pressure measured at the regulator inlet or at the self closing valve's inlet

3.3.2 regulated pressure value of the gas pressure measured at the regulator outlet

3.3.3 nominal regulated pressure p d value of the regulated pressure corresponding:

⎯ either to the normal pressure for appliances as defined in 3.6 of EN 437:2003;

⎯ either to the normal pressure for appliances operating outside the scope of EN 437:2003;

⎯ or to an intermediate pressure allowing for the supply of a second or third stage regulator under the conditions fixed

3.3.4 lock up pressure p o the maximum pressure obtainable at no flow for all values of the supply pressure given in 6.1.2

3.3.5 pressure loss coefficient multiplication factor equal to 0,85 for a pressure loss of 15 % and 0,5 for a pressure loss of 50 %

3.3.6 minimum admitted pressure p Mg minimum value of the regulated pressure supplied by the regulator for all values of the supply pressure and all values of the flow rate

The maximum admitted pressure, denoted as \$p_{Mp}\$, represents the highest regulated pressure provided by the regulator, applicable across all supply pressure levels and flow rates, ranging from the closing area to the guaranteed rate.

Terms and definitions concerning rates

M g the mass flow of gas that can be obtained at the minimum allowed regulated pressure, whatever the value of the supply pressure

NOTE The guaranteed rate is expressed in grams per hour (g/h) or kilograms per hour (kg/h)

M p for regulators up to 4 kg/h and for pressures complying with EN 437, gas flow (15 g/h) necessary for the supply of the ignition system of the appliance, generally called pilot

NOTE The pilot rate is expressed in grams per hour (g/h)

3.4.3 closing area for regulators over 4 kg/h or for pressures not complying with EN 437, range between 0 and 5 % of the guaranteed flow rate

3.4.4 operational area rate range between the pilot rate or the maximum of the closing area and 100 % of the guaranteed rate

Introduction

There are typically three types of pressure reduction:

• the supply pressure of the regulator is equal to the pressure of the LPG supply container(s);

• the regulator supplies a gas appliance

• the supply pressure of the first regulator is equal to the pressure of the LPG supply container(s);

• the supply pressure of the second regulator depends on the regulated pressure of the first regulator and on the pressure losses in the intermediate line;

• the second regulator supplies a gas appliance

• the supply pressure of the first regulator is equal to the pressure of the LPG supply container(s);

• the supply pressure of the second and the third regulator depends on the regulated pressure of the upstream regulator and on the pressure losses in the intermediate upstream line;

• the third regulator supplies a gas appliance.

Regulators for installations where the final regulator supplies a pressure specified in EN

The last regulator, which supplies a gas appliance for pressures specified by EN 437 shall be a fixed regulator (see 3.1.2)

It is recommended that all the other regulators of the installation are fixed regulators

For interchangeability the recommended nominal value of intermediate regulated pressures (p d) are the following:

These settings account for pressure losses in the interstage piping, typically designed for a maximum loss of 15% However, in instances where additional equipment, such as limiters, is installed, pressure losses can reach up to 50%.

Other regulators

To supply appliances with pressures which are different from those specified by EN 437 fixed, variable or adjustable regulators are used

General

Regulators shall be designed, manufactured and assembled in such a way that their operation is satisfactory under the installation and service conditions specified by the manufacturer

The safety devices, if incorporated in or onto the regulators covered by this document shall be designed and constructed in accordance with the provisions of annexes A and B

All the parts of a regulator shall be free from sharp corners or edges capable of causing damage, deterioration, injury or faulty operation

Parts shall be clean internally and externally

Screw and pin holes for assembling and securing regulator components must not intersect with gas pathways It is essential that the wall thickness separating these holes from the gas ways is a minimum of [insert thickness here].

Holes required for machining that connect gas pathways to the atmosphere, without affecting the regulator's operation, must be permanently sealed with metal Additional sealing compounds can be utilized as needed.

Where pressure tight joints are made on threads they shall be in accordance with ISO 7-1 or with ENPT

Devices capable of modifying the operation of the regulator shall not go out of adjustment and shall be sealed

In particular, the regulator body and cover shall be assembled in such a way that separation is not possible without permanent damage to these parts or the sealing

For variable regulators the adjustment range shall be limited by two fixed stops It shall not be possible to reduce the regulated pressure below 5 mbar

The operation of mobile parts, for example diaphragms or bellows, shall not be impaired by other parts

To achieve the desired adjustment, a marking device with numerical values can be utilized, where larger numbers represent higher pressures, or alternatively, a gauge can be installed to display the regulated pressure.

The adjuster can only be removed when it is set to the minimum pressure position To achieve higher regulated pressures, the adjustment must be made by rotating the adjuster clockwise.

Any tap shall close clockwise.

Materials

The materials' quality, dimensions, and assembly methods must ensure secure construction and performance The performance characteristics should remain stable throughout the manufacturer's declared lifespan, provided the regulator is installed and used according to the manufacturer's guidelines Under normal operating conditions, all components must endure the mechanical, chemical, and thermal stresses they encounter during use.

The regulator shall withstand the action of organic substances, either of vegetable or animal origin

The body shall be made of metallic material However for regulators having a regulated pressure of up to

For applications requiring a pressure of 200 mbar and a flow rate below 4 kg/h, a quick coupling with a self-closing valve and a non-threaded outlet connection should be directly attached to the cylinder Non-metallic materials, such as thermoplastics or thermosetting substances, are permissible if they comply with the specifications outlined in this document and the additional special requirements specified in Annex E.

Internal components and cover parts not associated with pressure, excluding connections (refer to Figure 2), can be constructed from non-metallic materials such as thermoplastics or thermosetting plastics, as long as they fulfill specific requirements.

⎯ the materials used shall meet the requirements of annex E;

⎯ the whole regulator shall withstand the various tests specified in the body of the document;

⎯ the regulator, with non metallic parts removed, shall resist a pressure test as in 7.2.2.3 remaining sound in the sense of 5.5 and without causing any danger

Zinc alloys must meet the Zn Al4 or Zn Al4 Cu1 quality standards as specified by ISO 301, while brass alloys are required to conform to EN 12164 or EN 12165 standards.

Components made of non-metallic materials shall only be used if they are not submitted to a temperature higher than 80 °C."

Rotating threaded connections, both male and female, must be constructed from brass in compliance with EN 12164 or EN 12165 standards, or from steel It is essential that the materials and manufacturing processes employed do not introduce any risk of stress corrosion.

Steel internal parts shall be protected against corrosion

Fixed threaded connection parts must be constructed from metallic materials, while non-threaded fixed components can be made from non-metallic materials, such as thermoplastics or thermosetting substances, as long as they meet the testing requirements outlined in Annex E.

The assembly of parts of the gas ways intended to assure soundness shall not be made with solder whose lowest temperature in the melting range, after application, is below 450 °C

Non metallic (thermoplastic or thermal setting) components used in the construction of the regulator shall meet the special requirements of annex E

Elastomeric components must meet the standards outlined in EN 549, particularly regarding temperature specifications and ozone resistance for diaphragms Furthermore, reinforced materials are required to adhere to the additional criteria specified in annex F.

Figure 2 - Regulator diagram showing the metallic parts

Special requirements

Pressure sensing subassembly

The dimensions, shape and the method of assembly of the components of the pressure sensing subassembly shall avoid any risk of damaging the diaphragm

The pressure sensing subassembly must be designed to ensure that the regulator operates according to the requirements outlined in section 6, considering the manufacturer's specified mounting positions Additionally, the regulator is required to fulfill the lock-up criteria across all designated mounting configurations.

Whatever the position taken by the diaphragm, the spring shall not be fully compressed

The diaphragm shall withstand, without rupture or slipping out of its fixing, the tests described in 7.2.2.2.

Regulation subassembly

At lock-up, the regulation subassembly shall act as a seal between the supply pressure and the regulated pressure It shall not move accidentally in use

The soundness and function of the regulation subassembly shall not be affected by the tensile strength and bending tests on the connections

After the test defined in 7.2.4, the valve shall not be displaced or come out of its housing.

Back pressure subassembly

The design of the support surfaces for both the cover and the body must ensure that the diaphragm is securely held in place, enabling it to withstand the pressure tests specified in section 7.2.2.

To reduce the risks of accidental blockage and minimize rainwater penetration, it is essential to mount or place objects in a manner that ensures their cross section does not exceed 3 mm².

The regulator is designed to minimize the risk of accidental damage to its internal components from objects that may enter through the vent hole, provided it is installed according to the manufacturer's instructions.

Adjustable regulators must allow for the adjustment of values during installation, and once set, the adjustments should be lockable and sealable to ensure stability and security.

Connection subassembly

First and single stage regulators for mobile cylinders must include an integrated filter made from corrosion and gas-resistant materials This filter should be positioned at the regulator inlet, upstream of the valve pad, and its mesh must comply with ISO 565, ensuring that the opening does not exceed the recommended dimensions of 125 or a diameter of 0.14 mm for perforated sheets.

For other types of regulators the manufacturers instructions shall state the requirements relating to the installation of a filter upstream

The connections shall be of the following types:

⎯ flanged: when flanges are used, they shall fit connections in accordance with ISO 7005-2 with dimensions corresponding to PN 16;

Threaded connections, where the seal is formed on the thread, are applicable for nominal diameters up to DN 50 However, parallel internal connection threads made of zinc or aluminum are only allowed for diameters up to and including DN 10.

The equivalent dimensions of connections are given in Table 1

Thread designation according to ISO 7-1 or EN ISO 228-1

Nominal dimension of flanges according to ISO 7005-2

The connections shall comply with a) inlet connections:

1) one of the types in Figures G.1 to G.49 2) if they are threaded;

2) one of the types in Figures G.50 to G.99 3) if they are not threaded;

3) future types will be acceptable providing they are not interchangeable with the connections specified in this document, and providing their assembly gives an equivalent degree of safety;

4) for connections made with a rotating nut using a seal the backward movement of the nut shall be sufficient to expose the seal completely b) outlet connections:

1) one of the types in Figures H.1 to H.49 4) if they are threaded;

2) one of the types in Figures H.50 to H.99 5) if they are non threaded;

3) other connections may be mounted provided that the regulator is sold with a fixed outlet tube;

4) future types will be acceptable providing they are not interchangeable with the connections specified in this document, and providing their assembly gives an equivalent degree of safety

2) A range of 49 figures has been reserved for each type of connections However, the needs of this document do not use all this range.

5) A range of 50 figures has been reserved for each type of connections However, the needs of this document do not

Tables G.1, G.2 and H.1, H.2 show, for information, the inlet and outlet connections used in the various countries depending on their use

If the regulator incorporates a pressure test point, the diameter of the hole through the pressure test point shall not exceed 1,5 mm

The connection shall be designed in such a way that it ensures the soundness function of the connection under the assembly conditions specified in the manufacturers instructions

If the union connection incorporates a seal it shall:

⎯ be mounted in such a way that it cannot fall off;

⎯ be easily replaced by a new seal, if necessary, without using special tools;

⎯ have a size in accordance with the indications given in annexes G and H;

⎯ be fixed onto the regulator so as to be subject to all the tests in this document

!No distortion or breakage shall be evident and the regulator shall comply with the soundness test described in 5.5 after application of the forces defined in 5.4.2 and 5.4.3."

In addition, the manufacturer's instructions shall specify the use of a spanner when this is necessary for fitting or removing the regulator

Accidental disconnection shall not be possible, especially when operating the gas opening or closing device

To ensure safety, a mechanism must be in place to prevent a single continuous movement of the control when turning off the gas and disconnecting the regulator This mechanism should require separate operation before the regulator can be safely disconnected.

5.3.4.3 Regulators for fitting to a self closing valve

Regulators designed for self-closing valves, whether threaded or equipped with a quick coupling, must include a manual shut-off mechanism for controlling gas flow This feature ensures that users can manually open and close the gas supply as needed Additionally, the open and closed positions of the regulator should be clearly marked and easily visible during use.

It is essential to ensure external soundness while fitting or removing the regulator on the valve, even if the manual gas opening device is inadvertently left open During disconnection, only the gas volume within the connection may escape If this condition cannot be satisfied, the fitting and removal process must only occur with the gas valve in the closed position.

Mechanical strength

Resistance to impact

The regulator must be able to withstand a fall onto hard ground when directly connected to a cylinder valve, as specified in section 7.2.1, while still functioning according to the requirements outlined in Clause 6.

Resistance to pressure

5.4.2.1 The regulator shall be capable of resisting the pressure test described in 7.2.2.1 without rupture

5.4.2.2 The regulator shall be capable of resisting the pressure test described in 7.2.2.2, without rupturing the diaphragm

After these two tests, the regulator shall meet the soundness requirement specified in 5.5

5.4.2.3 The regulator shall be capable of resisting the pressure test described in 7.2.2.3 without rupturing at the level of the body/lid assembly.

Strength of connections

5.4.3.1 Strength of the union/regulator connection

The inlet connection's attachment to the regulator body, regardless of whether it is threaded, non-threaded, or a single piece, must endure specific tests as outlined in section 7.2.3.

⎯ a torque of at least 30 N⋅m in both directions (see Table 12);

⎯ a bending moment created by a force of 400 N directed upwards and whose application point is at the base of the outlet connection (see Table 14);

⎯ a tensile strength test of 2 000 N (see Table 12)

The outlet connection attached to the regulator body, regardless of whether it is threaded, non-threaded, or a single piece, must withstand specific tests as outlined in section 7.2.3, Table 13, particularly for non-threaded hose connections.

1) a torque of at least 30 N⋅m in one direction (verification not required for one piece connection and for freely rotating connections);

3) a tensile strength test of 2 000 N (verification not required for one piece connection) b) threaded unions

1) a torque of at least 30 N⋅m in both directions (verification not required for freely rotating connections);

2) a bending moment of 10 N (not required for one piece connection);

3) a tensile strength test of 2 000 N (not required for one piece connection)

For freely rotating connections, the required torque for rotation must not exceed 0.5 N⋅m after all tests on samples 3 and 5, as outlined in Table 10 (refer to section 7.1.4).

⎯ for regulators with a nominal diameter ≥ DN 15, both connections shall resist a torque of 100 N⋅m

5.4.3.2 Strength of regulator assembly when fitted

The regulator when installed as indicated in the manufacturers instructions, shall resist the following tests, under the conditions defined in 7.2.3: a) a torque in both directions

1) of at least 20 N⋅m for non threaded hose outlet connections (15 N⋅m for quick coupling connections);

2) as specified in Table 2 for threaded connections and flanged connections In addition, regulators with screwed unions vertically mounted onto the valve, shall resist a torque of at least 20 N⋅m in the regulators plane (15 N⋅m for quick coupling connections);

Table 2 — Torque applicable to threaded connections and flanged connections

Torque for cylindrical threaded connections with elastomer joint

Torque for other threaded connections and flanges

A bending moment of 400 N is generated by an upward force applied at the base of the outlet connection Additionally, a tensile strength test of 2,000 N is conducted, although verification is not necessary for inlet connections that are screwed onto the valve.

The mechanical strength required shall be ensured for all the positions of fixing of the regulator (as indicated in the manufacturers instructions) onto the installation.

Soundness

The regulator shall be sound for all pressures and conditions defined in 7.2.5.1

The manual closing device shall be sound for all pressures and requirements indicated in 7.2.5.2

Soundness is deemed acceptable when the leak rate is below 15 cm³/h for regulators with a nominal diameter of DN 15 or smaller, and below 30 cm³/h for regulators with a nominal diameter exceeding DN 15.

For regulators with quick connections, it is essential to ensure a secure connection regardless of the mounting position Additionally, if the regulator is capable of rotation, the integrity of the connection must be maintained in all positions, including during the rotation process.

Mechanical endurance

General requirements

Under the conditions defined in 7.2.6.1, the regulator shall resist 50 000 cycles of opening/complete closing of the valve without mechanical failure and remaining sound in accordance with 5.5

After the endurance test, the closing pressure must not vary by more than ± 5% from the pre-test measurement Furthermore, the regulation curves, as outlined in section 7.3, should stay within the boundaries defined by the perimeter ABCDE in Figure 3.

Under the conditions defined in 7.2.6.2, the regulator connected to its tap shall resist, for 5 000 cycles out of

50 000 defined in 5.6.1, of opening and closing of the tap

After the test the regulator connected to its new tap shall operate, remain sound in the sense of 5.5 and meet the general requirements of 5.6.1

Under the conditions defined in 7.2.6.3, the quick coupling regulator shall resist 5 000 cycles of disconnection/connection to the valve for which it is designed

After the tests, the regulator connected to a new valve shall meet the general requirements of 5.6.1

5.6.2.3 Regulator with freely rotating outlet connection

Under the conditions fixed in 7.2.6.4, the connection shall resist 2 500 cycles of rotation

After the tests, the regulator shall remain sound in accordance with 5.5.

Resistance to humidity changes

Any material likely to be altered by humidity shall be submitted to a test cycle for resistance to humidity changes as defined in 7.2.7

The mass increase between the first and second weighings must not exceed 20% of the initial mass, while the change in mass from the first to the third weighing should remain within 5% of the initial mass.

Resistance to corrosion

The complete regulator, not connected at the ends, is subjected to the tests defined in 7.2.8

Following the test, a visual inspection must show that there is no corrosion on components that could affect proper functioning, excluding any salt deposits from the test The performance characteristics should continue to meet the specifications outlined in section 6.

General

Introduction

Under the specified test conditions in section 7.3, the regulator operation curves, as determined by the method in section 7.3.2, must remain within the boundaries set by the pressure and guaranteed rate limits outlined in section 6.2.

The regulator operation curves shall show no anomalies that indicate a fault

Adjustable and variable regulators shall comply with operating requirements of this document in the regulated pressure range declared by the manufacturer

The range of an adjustable regulator shall remain within a tolerance of ± 15 % of the nominal regulated pressure.

Supply pressure

- Regulators directly supplied at the gas container pressure:

Butane : pressure range: 0,3 bar – 7,5 bar Propane : pressure range: 1 bar – 16 bar LPG : pressure range: 0,3 bar – 16 bar

- Regulators supplied by another regulator:

Performances are verified with the minimum and maximum supply pressures declared by the manufacturer.

Regulated pressure

For regulators which supply gas appliances for pressure specified by EN 437, see Table 3.

For regulators with pressures which are different from those specified in EN 437: p max: coefficient of 1,2 p min: coefficient of 0,7 p 0: coefficient of 1,3

Table 3 – Pressure characteristics of the regulator based on nominal pressures given in EN 437

Appliance Categories a) bar p d p Mg p Mp p 0 mbar p n p min p max

Propane 1 - 16 148 105 180 185 5 148 100 180 3+ a) For information, data from EN 437

Supply pressure and regulated pressure according to 4.2

Single stage fixed regulator for EN 437 pressures

Butane: 0,3 bar to 7,5 bar LPG: 0,3 bar to 16 bar Propane: 1 bar to 16 bar Regulated pressure:

Two stages fixed or adjustable regulators for EN 437 pressures

6.2.2.1 First regulator, fixed or adjustable

Butane: minimum: 0,3 or p d + 0,2 if greater – Maximum: 7,5 bar LPG: minimum: 0,3 or p d + 0,2 if greater – Maximum: 16 bar Propane : minimum: 1 or p d + 0,5 if greater – Maximum: 16 bar

Definition of the pressure Numerical application given for information

Maximum pressure p max = p d× 1,2 3,60 1,80 1,20 0,90 0,60 0,48 0,36 0,18 Minimum pressure p min = p d × 0,7 2,10 1,05 0,70 0,53 0,35 0,28 0,21 0,11

Nominal regulated pressure of the upstream regulator p d 3 1,5 1 0,75 0,5 0,4 0,3 0,15

Maximum pressure p max = p d × 1,3 3,90 1,95 1,30 0,98 0,65 0,52 0,39 0,20 Minimum pressure p min = p d × 0,7 × 0,85 1,79 0,89 0,60 0,45 0,30 0,24 0,18 0,09

According to the pressure loss(es) of 15 % or 50 % p min = p d × 0,7 × 0,5 1,05 0,53 0,35 0,26 0,18 0,14 0,11 0,05

Three stages fixed or adjustable regulators for EN 437 pressures

Butane: minimum: 0,3 or p d + 0,2 if greater – Maximum: 7,5 bar LPG: minimum: 0,3 or p d + 0,2 if greater – Maximum: 16 bar Propane: minimum: 1 or p d + 0,5 if greater – Maximum: 16 bar

Maximum lock Up pressure p 0 = p d × 1,3 3,90 1,95 1,30 0,98 0,65 0,52 0,39 0,20 Maximum pressure p max = p d× 1,2 3,60 1,80 1,20 0,90 0,60 0,48 0,36 0,18 Minimum pressure p min = p d × 0,7 2,10 1,05 0,70 0,53 0,35 0,28 0,21 0,11

Maximum pressure p max = p d × 1,3 3,90 1,95 1,30 0,98 0,65 0,52 0,39 0,20 Minimum pressure p min = p d × 0,7 × 0,85 1,79 0,89 0,60 0,45 0,30 0,24 0,18 0,09

According to the pressure loss(es) of 15 % or 50 % p min = p d × 0,7 × 0,5 1,05 0,53 0,35 0,26 0,18 0,14 0,11 0,05

Maximum lock Up pressure p 0 = p d× 1,3 1,95 1,30 0,98 0,65 0,52 0,39 0,20 Maximum pressure p max = p d × 1,2 1,80 1,20 0,90 0,60 0,48 0,36 0,18 Minimum pressure p min = p d× 0,7 1,05 0,70 0,53 0,35 0,28 0,21 0,11

Maximum pressure p max = p d × 1,3 1,95 1,30 0,98 0,65 0,52 0,39 0,20 Minimum pressure p min = p d × 0,7 × 0,85 0,89 0,60 0,45 0,30 0,24 0,18 0,09

According to the pressure loss(es) of 15 % or 50 % p min = p d × 0,7 × 0,5 0,53 0,35 0,26 0,18 0,14 0,11 0,05

Variable regulators

For variable regulators it is considered that those regulators may operate in a regulated pressure range specified by a minimum pressure (p dmin) and a maximum pressure (p dmax)

Their performances shall be checked in the range [p dmax × 1,3 ; p dmax × 1,2 and p dmax × 0,7] and in the range [p dmin × 1,3 ; p dmin × 1,2 and p dmin × 0,7] with p dmin ≥ 5 mbar.

Regulators out of the pressures of EN 437

For regulators which are out of the pressures of EN 437, other pressures may be chosen

The minimum and maximum inlet and regulated pressures are specified with the same coefficients as those given in 6.2.1 to 6.3

Key Δ = M p for pressures of EN 437 and flow rate less than or equal to 4 kg/h or 5 % of M g in the other cases

1 Rate (g/h or kg/h) ² Regulated pressure (mbar or bar) a) Figure 3 - Operating limits allowed

General conditions

Type of test gas

All gas tests involving the regulator, except for the soundness test conducted with air, can be performed using air at a temperature of (20 + 5) °C or reference propane.

Reference propane, classified as G 31 in EN 437:2003, is compared to dry air as outlined in the same standard The equivalence ratio between air and propane is determined by the formula: \$ q_n(\text{air}) = 1.2454 \, q_n(\text{G 31}) \$, where the flow rates of air and propane are measured in liters per hour (l/h).

Test conditions

Unless stated otherwise tests shall be carried out at a room temperature of (20 + 5) °C, which remains constant during each test

All measurements are corrected to reference conditions: 15 °C, 1 013,25 mbar

If the regulator controls the valve opening, the tests shall be carried out on the valve/regulator assembly.

Equivalence formulas

The mass rate for the specified gas type on the regulator can be determined under reference conditions using the formula: \$\frac{\rho}{\rho}\$.

The mass rate of the gas under reference conditions, denoted as \$M_g\$, is measured in kilograms per hour (kg/h) The volume rate, represented as \$q_n\$, is the measured volume of the reference gas, expressed in cubic meters per hour (m³/h), and is corrected to reference conditions as specified in section 7.1.2, following the appropriate formula.

The actual volume rate measured, denoted as \$q_{measured}\$, is expressed in cubic metres per hour (m³/h) It is influenced by the temperature (\$t\$) in degrees Celsius (°C) and the atmospheric pressure (\$p_a\$) in millibars (mbar) Additionally, the density (\$ρ\$) of the reference gas, measured in kilograms per cubic metre (kg/m³), is defined under reference conditions as per sections 7.1.1 and 7.1.2 Furthermore, the density of the average liquefied petroleum gases used in the appliance, represented as \$ρ_g\$, is also measured in kilograms per cubic metre (kg/m³) as outlined in section 3.2.

Test samples

For the full sequence of tests, six identical samples are required

Six regulators shall be numbered and submitted to the series of tests defined in Table 10 in the order indicated

NOTE Details concerning sampling are outside the field of this document and should be agreed between the manufacturer and the certification body

7.3 Verification of performance characteristics (before)

7.3 Verification of performance characteristics (after)

Verification of constructional characteristics

Resistance to impact

A complete regulator, whose unions have not been protected, is dropped from a height of one metre in any position onto a hard floor (for example a concrete area)

The requirements given in 5.4.1 shall be verified, only the distortion due to the fall onto the ground is allowed.

Resistance to pressure

The requirements given in 5.4.1 shall be verified, only the distortion due to the fall onto the ground is allowed

During the whole duration of the tests described in 7.2.2.1, 7.2.2.2 and 7.2.2.3, the temperature of the regulator and of the supply water shall be maintained at (50 + 2) °C

NOTE Tests intended to be carried out with water can be carried out with air or with nitrogen provided that adequate safety measures are taken

When the regulator has a safety valve, these tests shall be carried out in accordance with annex A

7.2.2.1 A regulator is connected by its inlet to a pipe supplied with water After reaching the required temperature, the outlet connection is blocked and the pressure of water is increased to 1,75 times the maximum supply pressure (p a) The test shall not last less than 15 min after the application of the pressure

At the end of this test, the requirements of 5.4.2 shall be met

The regulator is linked to a pipe that supplies air or nitrogen Once the desired temperature is achieved, the pressure of the air or nitrogen is raised to 1.5 times the regulated pressure, with a minimum of 0.5 bar The testing duration must be at least 15 minutes, during which the leak rate at the regulator should not exceed 50 cm³/h.

At the end of this test, the requirements of 5.3.1 and 5.4.2 shall be met

7.2.2.3 Another regulator is connected by its outlet to a pipe supplied with water The inlet connection, the vent and any other orifice opening to the atmosphere are blocked It is allowed for the diaphragm to be pierced at the end of the test

After reaching the required temperature, the water pressure is increased to the maximum supply pressure The test shall not last less than 15 min after the application of the pressure

After each of the three tests described above the requirements of 5.4.2 shall be met.

Regulation subassembly

Soundness

Mechanical endurance

The regulator is linked to a pipe that supplies air or nitrogen Once the desired temperature is achieved, the pressure of the air or nitrogen is raised to 1.5 times the regulated pressure, with a minimum of 0.5 bar The test must last at least 15 minutes, during which the leak rate at the regulator should not exceed 50 cm³/h.

At the end of this test, the requirements of 5.3.1 and 5.4.2 shall be met

7.2.2.3 Another regulator is connected by its outlet to a pipe supplied with water The inlet connection, the vent and any other orifice opening to the atmosphere are blocked It is allowed for the diaphragm to be pierced at the end of the test

After reaching the required temperature, the water pressure is increased to the maximum supply pressure The test shall not last less than 15 min after the application of the pressure

After each of the three tests described above the requirements of 5.4.2 shall be met

Tests for mechanical strength shall be carried out using a dynametric device allowing the measurement of forces to within ± 5 % accuracy

For the torque test a system which neutralizes bending moments shall be used (if a torque wrench is used it is desirable that this is double handed)

The application of torque forces is subject to specific conditions: a) regulators with a capacity of 4 kg/h or less must be fixed at the points indicated in Tables 12, 13, and 14; b) for regulators exceeding 4 kg/h, checks outlined in section 5.4.3 should be performed following the manufacturer's installation instructions; c) for flanged connections per ISO 7005-2, the tightening force for flange nuts is specified in Table 11.

Table 11 — Tightening force for the flange bolts as in ISO 7005-2

20 20 30 30 30 30 50 50 50 d) The duration of application of the torques and forces shall be 1 min

Table 12 - Mechanical strength test on inlet connections (union/regulator connection)

Test diagram Force Assembled Integral

Table 13 – Mechanical strength test on outlet connections (union/regulator connection)

Test diagram Force Assembled Integral

T = torque; F = tensile strength; M = bending moment

Table 14 - Mechanical strength tests for the regulator assembly mounted on its cylinder valve

(self closing valve or manual valve)

Test diagram Force Threaded inlet connection

Key regulator fixing points; F = tensile strength ; F1 = bending moment valve T, T1, T2 = torque

T and T2 are not applied if the regulator is freely turning on its cylinder valve

For the tests carried out as in Table 14,

⎯ for regulators with threaded connections, the connection shall be mounted on its valve as indicated in the manufacturers instructions;

For regulators with quick coupling, a tensile strength test of 15 N⋅m is not required if the inlet connection can rotate However, if the connection is secured in its original position, the regulator must undergo testing in that state.

In all cases the requirements of 5.4.3 shall be met

The valve is positioned within its housing inside a pressurized container filled with liquid propene, ensuring that the entire assembly is fully immersed, such as having 50 ml of liquid in a 200 ml container.

After 72 h at (20 ± 5) °C, the container is emptied, the valve and its housing are taken out

Upon removal from the container, the assembly must be inspected within 10 minutes to ensure it meets the specifications outlined in the final section of 5.3.2 regarding the valve.

This test can be carried out according to the methods used in the laboratories provided that these methods give results that can be reproduced

The measurement shall be given with an accuracy of 20 % of the maximum permitted value

In the event of disagreement the method described in annex D shall be used

The regulator is linked to an air supply pipe with an inlet pressure of 150 mbar, followed by pressures of 8.25 bar for butane regulators and 17.6 bar for propane and LPG regulators The testing duration must be at least 2 minutes after the pressure is achieved.

The regulator connection and tightening torque shall be as specified by the manufacturer unless otherwise specified in this document

If the regulator is fitted with a manual closing device, this shall be in the open position

The regulator is then connected through its outlet connection to a pipe supplied with air at a pressure of

150 mbar for regulators for which the regulated pressure is less than 100 mbar and 1,5 times the regulated pressure for regulators for which the regulated pressure is greater than 100 mbar

When the regulator is fitted with a freely rotating outlet connection, the tests shall be carried out in any position of the outlet connection

The requirements of 5.5 shall be met

7.2.5.2 Soundness of the manual closing device

A thin, flexible hose is fitted to the regulator’s outlet The regulator is connected to its valve

When the valve is in the "closed" position and the supply pressure is at $ p $, gas flow stops, and no bubbles are observed when the flexible hose is submerged in water for at least 2 minutes at a depth of approximately 15 mm.

The test will be conducted at two supply pressure values, specifically the minimum and maximum pressures designated for the regulator being evaluated.

The requirements of 5.5 shall be met

At the inlet of a pipe, air is supplied at a pressure of 1.4 bar for butane regulators and 7.5 bar for propane and LPG regulators, which are directly connected to the gas container pressure The nominal supply pressure for other regulators is maintained at a temperature of (20 ± 5) °C.

⎯ at its outlet, to a jet giving a rate equal to 20 % of the guaranteed rate

Quick acting valves are installed upstream and downstream of the regulator

The valves are connected to an appropriate timer in such a way that when one of the valves opens, the other closes with a length of complete cycle of approximately 5 s

The test shall be carried out in such a way that the diaphragm has completely relaxed and the valve maintained on its seat for a period of at least 1 s

The requirements of 5.6.1 shall be met

The life test on the tap shall be carried out at ambient temperature in accordance with the following method:

Air flows through the tap at a pressure of 1.4 bar for butane regulators and 7.5 bar for propane and LPG regulators, at a temperature of (20 ± 5) °C This air is directed to a calibrated injector located downstream of the regulator, achieving a flow rate that is 20% of the guaranteed rate.

The tap must endure 5,000 cycles of opening and closing, where each cycle involves rotating from the closed to the fully open position while applying a torque of 0.3 N⋅m in both positions The operational frequency is set at (6 ± 2) cycles per minute.

After completing 5,000 cycles, the tap must be closed with a torque of 0.5 N⋅m, and its integrity will be assessed using air at both working pressures and the minimum and maximum temperature ranges.

The same test shall be carried out with an opened tap (injector sealed)

The requirements of 5.6.2.1 shall be met

The regulator is connected to a new valve, 5 000 cycles of disconnection and connection are carried out, each cycle lasting 5 s approximately

When designing a coupling that automatically opens a valve, testing must be conducted at a pressure of 0.5 times the maximum supply pressure.

After the disconnection test the forces described in 5.4.3.2 b) and c) shall be applied to the regulator

The requirements of 5.6.2.2 shall be met

7.2.6.4 Regulator with a freely rotating outlet connection

Under the conditions described in Figure 4, the outlet connection shall resist a bending of 0,5 N.m and the regulator shall resist 2 500 rotation cycles

At the end of this test, the requirements of 5.6.2.3 shall be met

Resistance to corrosion

Verification of performance characteristics

General

Tests shall be carried out whilst maintaining the regulator and gas at the temperatures shown in Table 15 Performance tests shall be carried out:

⎯ for regulators having a rate of up to and including 4 kg/h, in all possible positions for fixing the regulator onto the installation;

⎯ for regulators having a rate exceeding 4 kg/h, in the installation position or positions recommended by the manufacturer in the instructions

These tests, as well as the soundness test, shall be carried out before and after the endurance test

Performance tests can be carried out using calibrated orifices or using rate meters which enable the obtaining of a full range of rates up to the guaranteed rate

NOTE The closing pressure should be measured 5 s after the effective closure

The diameter of the pipework used shall be sufficiently large to avoid creating pressure drops which could influence the results

Whatever the method used tests are carried out with increasing rates from 0 to the guaranteed rate, then for decreasing rates from the guaranteed rate to closure at no flow

All the points obtained in this way give the regulation curve for the supply pressure considered

V1, V2 Ball valves (DN ≥ inlet DN of R3, minimum DN 10)

P1, P2 Measuring devices of upstream pressure (class 0,1)

P3 Measuring device of downstream pressure (class 0,1)

C1 Flow rate measuring device d ≥ outlet DN of R3, minimum DN 10

NOTE The supply device (R1/V1, R2/V2) is given as a guide

Figure 5 a) – Performance tests: volume rate method

R1, R2 Supply adjustment regulator V1 to V8 Ball valves (DN 10)

P1, P2 Measuring devices of upstream pressure (class 0,1) R3 Regulator under test

P3, P4 Measuring devices of downstream pressure (class 0,1) T1 Thermometer (accuracy : 1 °C) d ≥ DN (10 min) NOTE The supply device (R1/V1, R2/V2) is given as a guide

Figure 5 b) – Performance tests: calibrated injectors method (principle)

Plotting of the performance curves

The performance curves are plotted under appropriate supply conditions:

⎯ for first or single stage regulators, the pressure values are those of Table 15, starting with maximum pressures;

⎯ for second or third stage regulators, the sole supply pressure value is the nominal indicated by the manufacturer for the whole temperature range given in Table 15

Table 15 — Performance curves - Supply conditions

Type of gas Temperature °°°° C Pressure bar

+20 ± 5 0,3 or p d + 0,2 if greater - 16 -20 ± 2 0,3 or p d + 0,2 if greater

+20 ± 5 1 or p d + 0,5 if greater - 16 -20 ± 2 1 or p d + 0,5 if greater

For temperatures different from 20 °C, the flow rate curve is restricted to the maximum flow rate for regulators with a capacity of 4 kg/h or less, or at 10% of the maximum flow rate, ensuring it does not fall below 4 kg/h for regulators with a capacity of 4 kg/h or more.

The curves illustrate the standard operational range of the regulator If the curve points are irregularly distributed, further testing at intermediate supply pressures is necessary to confirm that all operational points fall within the typical range.

General

All instructions, information, and warnings on the regulator and its packaging must be provided in the official language or languages of the country where the regulator will be sold.

Marking of the regulator

The regulator shall be marked with the following information in a legible, visible and durable manner, compatible with its lifetime:

⎯ the manufacturer's name or logo and, possibly, trademark;

⎯ trade name of the regulator, with marking in letters or figures allowing the identification of the regulator;

⎯ the type of gas: butane, propane or LPG;

⎯ minimum and maximum supply pressures, expressed in millibar or bar (mbar or bar);

⎯ nominal regulated pressure or range of pressure, expressed in bar (bar) or in millibar (mbar);

⎯ the guaranteed rate in kilograms per hour (kg/h);

⎯ the date of manufacture indicated by the last two figures of the year;

⎯ an arrow to show the direction of the flow of gas, where necessary;

⎯ a reference to this document: EN 13785

Any additional information given by the manufacturer shall not lead to confusion with the indications required by this document

It is recommended to mark on the regulator the type of connection (inlet/outlet) of the regulator i.e:G.52/H.1.

Packaging

The regulator must be safeguarded from foreign material through packaging that clearly specifies the gas type, nominal regulated pressure, and usage limits This includes details about the compatible cylinder valve type and size for the regulator, where applicable.

Instructions for installation, use and maintenance

Each regulator must include user instructions that detail essential information, excluding the manufacturing date, as outlined in section 8.2.

⎯ the manufacturer's address and, if necessary, his agent;

⎯ the assembly conditions, in particular the use of a filter, the preferred position, recommended by the manufacturer and the instructions concerning the use of a spanner;

⎯ the installation, safety and soundness conditions, in particular with regard to the seal and its condition;

In normal usage conditions, it is recommended to replace this regulator periodically to ensure the proper functioning of the installation.

10 years of the date of manufacture.”

When installing the regulator outdoors, it must be positioned or protected to prevent direct exposure to trickling water Additionally, relevant instructions should be provided for electrically isolating the regulator when it is mounted on a wall.

⎯ the operating temperature range of the regulator;

When installing a regulator downstream of another regulator, it is crucial to ensure that the supply pressure range is appropriate for the regulated pressure range of the upstream regulator, taking into account any pressure losses in the connecting piping.

⎯ a description of the operation of the safety devices (see annex A and annex B)

When the instructions are printed on the packaging of the regulator, they shall be easily removable so that they may be kept by the user

Special requirements for regulators fitted with pressure or rate operated safety devices

Regulators fitted with an over-pressure relief

Definition

An over-pressure relief device is designed to discharge gas when the pressure exceeds a predetermined level, featuring a vent tube that opens to the outside It automatically closes once the monitored pressure falls back to normal levels, ensuring safety during regular operation.

Constructional characteristics

The relief shall be integral with the regulator

It may be part of the pressure sensing subassembly of the regulator, a measuring device is not necessary The adjustment of the setpoint shall be protected against any unauthorized modification

In designs utilizing a pressure sensing subassembly for gas discharge, it is crucial to select the cross-sectional area of the valve and the connecting pipework to the atmosphere to prevent any unacceptable pressure increases within the pressure subassembly.

The device must include a component for connecting to a relief, such as an Rp 1/8 internal thread, to facilitate external discharge when the regulator is installed indoors Additionally, the discharge orifice should be shielded from rainwater, and the tube leading to the atmosphere can also function as a vent.

The guidelines must indicate that external connections should be made when using a regulator equipped with a relief valve in a residence They should include all essential details regarding this connection, particularly the maximum diameter and length of the tube.

Performance characteristics

A.1.3.1 Regulators having a maximum regulated pressure of up to and including 150 mbar

The opening pressure of the relief shall be between 2 times the nominal regulated pressure and 150 mbar, for ambient temperatures between -20 °C and +50 °C

Regulators designed to operate with pressures of 112 mbar or 148 mbar shall not be fitted with a relief valve

A.1.3.2 Regulators having a maximum regulated pressure exceeding 150 mbar

The valve shall operate in compliance with the regulations in force in the country of destination of the appliance

Test methods

The valve undergoes internal soundness tests, operational behavior assessments, and discharge verifications, while all strength and external soundness tests are conducted in accordance with the regulator's requirements.

Tests shall be carried out under the following conditions:

⎯ Internal soundness test before opening

The regulated pressure is elevated to 1.4 times the nominal level during testing, which is conducted at a room temperature of (20 ± 5) °C The relief system is deemed sound if the measured leak rate is below 15 cm³/h, indicating satisfactory performance at this pressure.

⎯ Behaviour in operation and discharge

For ambient temperatures of (-20 ± 2) °C, (+20 ± 5) °C and (+50 ± 2) °C, the regulated pressure is increased up to a value of 150 mbar The relief shall open between 2 times the nominal pressure and

150 mbar At the upper limit pressure, the gas rate released shall be at least 0,1 m 3 /h (air, under the reference conditions)

⎯ Internal soundness test after reclosing:

After the valve is opened and then reclosed, the pressure must decrease to 1.4 times the nominal regulated pressure, and the integrity of the system should be checked under the same conditions as prior to the opening.

The manufacturer's specifications shall be verified based on the information given to the test laboratory.

Regulator marking

In addition to the information required in 8.2, the regulator fitted with a relief valve shall carry the opening pressure.

Regulators fitted with an over-pressure shut off safety valve

Definition

Shut off device, trigged by an excessive regulated pressure, which causes the complete shut off of the gas flow for all values of supply pressure

The restoration of the gas flow shall only be possible by manual intervention when the conditions which cause the shut device to operate have disappeared

The regulator's manual device which enables the restoration of the gas flow is called the resetting device.

Constructional characteristics

The shut-off device can be either built into the regulator or function as a separate component Regardless of its configuration, the construction requirements for the shut-off device must align with those of the regulator.

The shut-off device must be equipped with an independent restrictor, a dedicated measuring device, and its own measuring pipework, ensuring that these components are not affected by the operation of an overpressure relief system.

The resetting device shall be protected against any intervention which could impair the operation of the over pressure shut off

The force required to close the valve from the open position must be at least equal to the resistance caused by the maximum gas pressure and the weight of the internal components, in addition to five times the frictional force.

The closing device must exert a closing force that is at least equal to the maximum supply pressure, the weight of the internal components, and twice the frictional force when in the closed position.

The diaphragm shall be designed and/or incorporated in such a way that it withstands, after setting, a pressure equal to the maximum supply pressure.

The device shall close the gas flow when the pressure measured downstream of the regulator is between

2 times the nominal regulated pressure and 150 mbar, under all use conditions

The regulators designed to operate with pressures of 112 mbar or 148 mbar shall not be fitted with an over- pressure shut off device

The device must adhere to the regulations applicable in the destination country and is designed to shut off the gas flow at pressures between 2 to 3 times the nominal regulated pressure.

Test methods

A.2.4.1 Test for the components transmitting the closing forces

The frictional force is measured with the closing spring removed and the valve in the open position

Prior to testing, the mechanism is held at (20 ± 5) °C for 24 h

The valve is moved in the closing direction, the force needed to initiate the motion is recorded

The test is first carried out at atmospheric pressure then at the maximum supply pressure

The highest closing force is the retained value

First a performance test as defined in A.2.4.3 shall be carried out at (20 ± 5) °C

The diaphragm of the shut off device shall then be subjected to a test pressure equal to the maximum supply pressure

This pressure shall be maintained for 10 min

A subsequent performance test will be conducted as outlined in A.2.4.3, ensuring that the operating pressures do not deviate by more than 10% from the values recorded in the previous test.

A.2.4.3.1 Regulators having a maximum regulated pressure of up to and including 150 mbar

Tests shall be carried out at (20 ± 5) °C

The device under test is supplied with compressed air through its outlet connection The supply pressure is increased up to the pressure at which the device energizes

At the time of the shut off, the pressure shall be below 150 mbar

After shut off, check that the gas flow remains cut off at any pressure below the maximum supply pressure

The test will be conducted again under the extreme temperature and pressure conditions outlined in Table 15, confirming that the operating pressure values fall within the tolerances specified in section A.2.3.1.

A.2.4.3.2 Regulators having a maximum regulated pressure exceeding 150 mbar

The manufacturer's specifications shall be verified based on the information required by the test laboratory.

Regulators fitted with an under-pressure shut off safety device

Definition

An under-pressure shut off safety device is a crucial component within the regulator that ensures the complete cessation of gas flow at all specified regulated pressure values This shut off can occur due to a lack of gas supply upstream of the regulator or an excessive gas flow rate downstream.

The components which provide control may also provide the safety function

The restoration of the gas flow shall only be possible by manual intervention when the conditions which cause the safety device to operate have disappeared

The regulator's manual device which enables the restoration of the flow is called the resetting device.

Constructional and performance characteristics

The device will only stop the gas flow when the downstream pressure measured after the regulator meets or exceeds the minimum pressure required at the device's inlet, as specified in column ôp minằ of Table 3.

The resetting device must ensure that there is no permanent gas flow opening when in the closed position, even after an impact It should be designed to remain either fully open or fully closed without manual intervention Additionally, if the device functions as a stopcock with a rotating handle, the gas shut-off direction must be clockwise.

The setting device must be safeguarded from any interference that could disrupt the normal functioning of the regulator during a reset, provided it serves no other purpose and is easily accessible.

Test methods

!Tests shall be carried out at (20 ± 5) °C

The device operates by receiving air at maximum supply pressure, with the outlet flow rate set to match the guaranteed rate Subsequently, the supply pressure is decreased to the level at which the device automatically shuts off.

When the shut-off occurs, the regulated pressure must meet or exceed the minimum pressure needed at the appliance's inlet or at the inlet of the subsequent regulator.

In the closed position, the supply pressure is initially reduced to zero and then gradually increased to its maximum During this test, the under pressure shut-off remains closed, ensuring that the leakage rate does not exceed 15 cm³/h.

Regulators fitted with an excess flow valve

Definition

The excess flow valve is a device integral with the regulator which causes the shut off of the gas flow for values of rate greater than the guaranteed rate

The restoration of the gas flow shall only be possible by manual or automatic intervention, when the conditions which caused the safety device to operate have disappeared

For manual devices, the flow restoration regulators can include either a resetting device or a valve, which are typically suitable for this type of regulator.

The excess flow valve is designed to shut off the gas flow whenever the flexible hose downstream of the regulator is disconnected It activates when the gas flow rate increases between 120% and 200% of the guaranteed rate, functioning effectively at a +10° angle relative to its axis in the regulator's fixed positions, and across the temperature ranges specified in Table 15.

Automatic resetting devices are allowed a maximum residual leak of 30 g/h to 60 g/h in the zero flow position, as per national regulations, to facilitate the resetting process.

For manual re-setting devices, a maximum residual leak between 15 cm 3 /h and 200 cm 3 /h according to the national regulations, is permitted

The presence of the device shall not modify the regulator's performance

For optimal performance, it is advisable to use a two-position tap integrated with the regulator, allowing for full opening and complete closure to ensure the excess flow function remains unaffected.

In any case the excess flow rate shall ensure its function and the shut off valve shall carry a marking allowing the identification of the direction of closure.

Test methods

Complementary tests for the regulator

A.4.3.1 The performance tests for the excess flow valve shall be carried out at the following operating temperatures:

The closure caused by the excess flow valve shall occur in the range defined between 120 % and 200 % of the guaranteed flow rate

A.4.3.2 After the tests for resistance to pressure and mechanical strength of the connection, carried out as described in 7.2.2 and in 7.2.3, the operation of the excess flow valve shall remain satisfactory at the temperatures given in A.4.3.1

A.4.3.3 The excess flow valve shall operate after the test for resistance to impact carried out as described in 7.2.1

A.4.3.4 For the endurance test, the device shall be subjected to a series of 1 000 cycles of opening/closing, without change in the operating forces, of the sensitivity of the positioning devices and without apparent traces of pitting This test shall be carried out at ambient temperature.

User and maintenance instructions

The manufacturer must clearly specify in the instructions the type of connection compatible with the regulator Additionally, when used on a cylinder, the instructions should include specific limitations of use beyond the requirements outlined in section 8.

⎯ do not move the cylinder during use;

⎯ close the cylinder valve in the event of operation of the excess flow valve;

Ensure the valve is only opened after addressing the device's operational issues If the valve has intermediate positions, it must remain fully open to enable the pressure limiter's function The regulator includes an excess flow valve that shuts off between 120% and 200% of the guaranteed flow rate Additionally, provide clear instructions on the regulator's operation and installation.

Regulators fitted with a regulated pressure limiter

Coefficient K

Measurement of the leak

Special conditions for carrying out the tests mentioned in the body of the document

informative) Test method for resistance to corrosion

Tiêu đề	Regulators With A Capacity Of Up To And Including 100 Kg/H, Having A Maximum Nominal Outlet Pressure Of Up To And Including 4 Bar
Trường học	British Standards Institution
Chuyên ngành	Standards
Thể loại	Standard
Năm xuất bản	2005
Thành phố	London

Định dạng
Số trang	148
Dung lượng	2,77 MB