Bsi bs en 15624 2008 + a1 2010

www bzfxw com BS EN 15624 2008 ICS 45 060 01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Railway applications — Braking — Empty loaded changeover devices +A[.]

National foreword

This British Standard is the UK implementation of

EN 15624:2008+A1:2010 It supersedes BS EN 15624:2008, which is withdrawn

The start and finish of text introduced or altered by amendment is indicated in the text by tags Tags indicating changes to CEN text carry the number of the CEN amendment For example, text altered by CEN amendment A1 is indicated by !"

The UK participation in its preparation was entrusted to Technical Committee RAE/4, Braking

A list of organizations represented on this committee can be obtained

on request to its secretary

This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard

was published under the

authority of the Standards

Policy and Strategy

This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom

EUROPEAN COMMITTEE FOR STANDARDIZATION

C O M I T É E U R O P É E N D E N O R M A L I S A T I O N

E U R O P Ä I S C H E S K O M I T E E FÜ R N O R M U N G

Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2010 CEN All rights of exploitation in any form and by any means reserved

worldwide for CEN national Members

Ref No EN 15624:2008+A1:2010: E

Foreword 4



1 Scope 5



2 Normative references 5



3 Terms, definitions and symbols 5



3.1 Terms and definitions 5



4 Design and manufacture 6



4.1 General 6



4.2 Functional requirements 7



4.2.1 General 7



4.2.2 Automatic empty-loaded changeover device 7



4.2.3 Pneumatic device characteristics 8



4.2.4 Automatic hydraulic to pneumatic converter 9



4.2.5 Automatic elastomeric to pneumatic converter 9



4.2.6 Components for operation of the manual empty-loaded changeover device 9



4.3 Vibrations and shock 10



4.4 Environment 10



4.4.1 General 10



4.4.2 Temperature 10



4.4.3 Other environmental conditions 10



4.5 Compressed air quality 12



4.6 Service life 12



4.7 Fire behaviour 12



4.8 External appearance 13



4.9 Design requirements regarding pressure stress 13



4.10 Leakage 13



4.11 Interfaces 13



4.11.1 Mechanical 13



4.11.2 Pneumatic 13



5 Materials 13



6 Type tests 14



6.1 General 14



6.2 Individual automatic empty-loaded changeover device type tests 14



6.2.1 Test bench for individual automatic empty-loaded changeover device type tests 14



6.2.2 Sampling for type tests 15



6.2.3 Test requirements 15



6.2.4 Check of physical and geometrical characteristics 16



6.2.5 Leakage 16



6.2.6 Changeover operation – empty to loaded 17



6.2.7 Changeover operation – loaded to empty 17



6.2.8 Response time – empty to loaded 18



6.2.9 Response time – loaded to empty 19



6.2.10 Shock and vibration tests 19



6.2.11 Operation at extreme temperatures 20



7 Routine test and inspection 21



8 Type validation 21



9 Manual empty-loaded changeover device installation validation 21



9.1 Equivalent handle movement 21



9.2 Changeover plate alignment 21



10 Documentation 21



11 Designation 22



12 Identification and marking 22



12.1 Identification plate 22



12.2 Changeover plate for the manual empty-loaded changeover device 22



Annex A (informative) Assessment of an empty-loaded changeover device when fitted to a vehicle 24



A.1 Vehicle assessment – Testing set up 24



A.2 Design acceptance testing set up 24



A.3 Single vehicle static testing 24



A.3.1 Vehicle requirements 24



A.3.2 Test procedures 24



A.4 Running tests 25



A.4.1 General 25



A.4.2 Pneumatic empty-loaded changeover device – Air consumption 25



A.4.3 Pneumatic empty-loaded changeover device – Output signal variation 26



Annex B (informative) Examples of manual empty-loaded changeover device handles and changeover plates 27



Annex C (informative) Test bench diagram 29



Annex ZA (informative) !!Relationship between this European Standard and the Essential Requirements of EU Directive 2008/57/EC of the European Parliament and of the Council of 17 June 2008 on the interoperability of the rail system within the Community (Recast)"" 30



Bibliography 32



Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights This document includes Amendment 1, approved by CEN on 2010-08-30

This document supersedes EN 15624:2008

The start and finish of text introduced or altered by amendment is indicated in the text by tags ! "

!This document has been prepared under a mandate given to CEN/CENELEC/ETSI by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive 2008/57/EC

For relationship with EU Directive 2008/57/EC, see informative Annex ZA, which is an integral part of this document."

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom

1 Scope

This European Standard is applicable to empty-loaded changeover devices designed to automatically sense when the load of a railway vehicle reaches a defined value (changeover mass), which represents the point at which the vehicle is classed as “loaded” and thereby requires the brake force to be adjusted accordingly to achieve the required brake performance This European Standard also covers manually operated empty-loaded changeover devices and the associated changeover plates

This European Standard specifies the requirements for the design, dimensions, manufacture and testing of empty-loaded changeover devices

2 Normative references

The following referenced documents are indispensable for the application of this document For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies

EN 14478:2005, Railway applications — Braking — Generic vocabulary

EN 50125-1, Railway applications — Environmental conditions for equipment — Part 1: Equipment on board

rolling stock

EN 60721-3-5:1997, Classification of environmental conditions — Part 3: Classification of groups of

environmental parameters and their severities — Section 5: Ground vehicle installations (IEC 60721-3-5:1997)

EN 61373:1999, Railway applications — Rolling stock equipment — Shock and vibration tests

(IEC 61373:1999)

EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,

tolerances and designation (ISO 228-1:2000)

ISO 8573-1:2001, Compressed air — Part 1: Contaminants and purity classes

3 Terms, definitions and symbols

3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 14478:2005 and the following apply

3.1.1

empty-loaded changeover device

device connected to the vehicle, which is either manually operated or responds automatically to a change of vehicle loading, thereby changing the state of the brake system at a defined value of vehicle mass (changeover mass) either when the load is increased or when the load is decreased by providing a signal to the brake control device

3.1.1.1

positive load signal pressure device

empty-loaded changeover device that provides a positive output pressure in the loaded state

3.1.1.2

zero load signal pressure device

empty-loaded changeover device that exhausts the output pressure to nominally 0 bar in the loaded state

automatic variable load sensing device

device connected to the vehicle, which responds to the loading of that vehicle to provide a continuous load proportional signal to the brake control device

3.1.4

mechanically operated pneumatic device

device or mechanism having both mechanical and pneumatic elements

3.1.5

hydraulic to pneumatic converter

device or mechanism which transforms the hydraulic pressure generated by the mass of the vehicle into a pneumatic pressure with a defined relationship

3.1.6

elastomeric to pneumatic converter

device or mechanism having both elastomeric and pneumatic components, which transforms the pressure in the elastomer generated by the mass of the vehicle into a pneumatic pressure with a defined relationship

3.1.7

output signal pressure

load signal pressure

Lsp

output pressure delivered by the empty-loaded changeover device, which signals the load state (either empty

or loaded) of the vehicle to the brake control mechanism

3.1.8

supply pressure

input pressure of the air supply in a pneumatic empty-loaded changeover device

NOTE Typically supplied from the vehicle distributor auxiliary reservoir, alternatively from the vehicle distributor output pressure or from the brake cylinder pressure

NOTE Airflow is often stated in normal litres per minute (Nl/min)

4 Design and manufacture

4.2.1.2 The empty-loaded changeover device shall, in all cases, supply an output signal (Lsp), which is a

function of the load

4.2.1.3 The empty-loaded changeover device shall not alter any of the characteristics of the distributor and/or any associated relay device, when fitted to a vehicle, thereby not altering the characteristics of the brake system, other than to signal the load change and thereby cause the brake cylinder pressure to change between the two states

4.2.1.4 The design of the empty-loaded changeover device shall either provide a positive output pressure (positive load signal pressure device) or exhaust the output pressure to nominally 0 bar (zero load signal pressure device) in the loaded state dependant on the applicable design requirements

4.2.1.5 The air consumption of a pneumatic empty-loaded changeover device shall, during running of the vehicle, be minimal and shall not interfere with the normal braking performance of that vehicle A test which can be used to confirm this is described in A.3.2

4.2.2 Automatic empty-loaded changeover device

4.2.2.1.3 An automatic empty-loaded changeover device may have a damping facility within its mechanism

to prevent the effects of transient suspension movement from causing a change of the load signal

4.2.2.1.4 An automatic empty-loaded changeover device shall be designed to fit to a vehicle in a position to sense the load change of that vehicle, causing a change of state of the changeover device This may be within the vehicle suspension system or linked to it, in order to sense the load change

4.2.2.2 Changeover response

Where the empty-loaded changeover device does not include integral damping the response of the output pressure shall be immediate, i.e the pressure shall fall or increase dependant on the particular design of the device, as soon as the device is moved from one state to another Where the empty-loaded changeover

device has integral damping a delay in the output pressure (Lsp) response shall be apparent

4.2.2.3 Empty to loaded changeover

4.2.2.3.1 Integrally damped device supplied with air from the distributor auxiliary reservoir or main reservoir

When the operating mechanism is moved to the loaded position and kept there for longer than 3 s the output pressure shall change to the loaded condition pressure for the particular design of the device as defined in 4.2.3 This shall be tested in accordance with 6.2.8.2

When the operating mechanism is moved to the loaded position and kept there for less than 3 s the output pressure shall not reach a value that causes a changeover to occur This is tested in accordance with 6.2.8.4

4.2.2.3.2 Device supplied with air from the distributor output pressure

When the operating mechanism is moved to the loaded position the output pressure shall change to the loaded condition for the particular design of the device as defined in 4.2.3 This shall be tested in accordance with 6.2.8

4.2.2.4 Loaded to empty changeover

4.2.2.4.1 Integrally damped device supplied with air from the distributor auxiliary reservoir/main reservoir

When the empty-loaded changeover device is in the loaded state and the operating mechanism is moved to the empty position and kept there for longer than 3 s the output pressure shall change to the empty condition pressure for the particular design of the device as defined in 4.2.3 This shall be tested in accordance with 6.2.9.2

When the operating mechanism is moved to the empty position and kept there for less than 3 s the output pressure shall not reach a value that causes a changeover to occur This shall be tested in accordance with 6.2.9.4

4.2.2.4.2 Device supplied with air from the distributor output pressure

When the operating mechanism is moved to the empty position the output pressure shall change to the empty condition for the particular design of the device as defined in 4.2.3 This shall be tested in accordance with 6.2.9

4.2.3 Pneumatic device characteristics

4.2.3.1 The device shall be designed to accept a pneumatic input pressure supplied direct from the vehicle distributor auxiliary reservoir or from the distributor output/brake cylinder pressure system

4.2.3.2 When the load is pneumatically transmitted to the brake control mechanism, the changeover

device shall produce a step in output signal pressure (Lsp) at a defined value of changeover mass between

the empty and loaded conditions

4.2.3.3 Where the input pressure to the empty-loaded changeover device is supplied from the auxiliary reservoir the following shall apply

a) For a positive load signal pressure device:

1) all values of the output pressure (Lsp) of ≤ 0,5 bar shall indicate a vehicle load that is less than the

changeover mass with the purpose of causing the brake control device to output its lower ratio;

2) all values of the output pressure (Lsp) of ≥ 3,0 bar shall indicate a vehicle load greater than the

changeover mass with the purpose of causing the brake control device to output its higher ratio A

lower output signal pressure (Lsp) than 3,0 bar is acceptable to signal a vehicle load greater than the

changeover mass, when an automatic variable load sensing device is used as an automatic loaded changeover device

empty-b) For a zero load signal pressure device:

1) all values of the output pressure (Lsp) of ≥ 3,0 bar shall indicate a vehicle load that is less than the

changeover mass with the purpose of causing the brake control device to output its lower ratio;

2) all values of the output pressure (Lsp) of ≤ 0,5 bar shall indicate a vehicle load greater than the

changeover mass with the purpose of causing the brake control device to output its higher ratio

4.2.3.4 Where the input pressure is supplied from the distributor output/brake cylinder pressure system the following shall apply

a) For a positive load signal pressure device:

1) the value of the output signal pressure (Lsp) indicating a vehicle mass greater than the changeover

mass, shall be equivalent to the distributor output/brake cylinder pressure;

2) the value of the output signal pressure (Lsp) indicating a vehicle mass lower than the changeover

mass, shall be 0 bar

b) For a zero load signal pressure device:

1) the value of the output signal pressure (Lsp) indicating a vehicle mass greater than the changeover

mass, shall be 0 bar;

2) the value of the output signal pressure (Lsp) indicating a vehicle mass lower than the changeover

mass, shall be equivalent to the distributor output/brake cylinder pressure

4.2.4 Automatic hydraulic to pneumatic converter

4.2.4.1 The load from the vehicle suspension applied mechanically to the empty-loaded changeover device shall result in a change in state of the device as a consequence of a change in hydraulic pressure within the device This change of state shall occur at a defined value of vehicle mass (changeover mass) and result in a step change in the pneumatic output signal pressure as in 4.2.3

4.2.4.2 The design shall incorporate a method of ensuring that normal transient movements of the vehicle suspension do not affect the state of the empty-loaded changeover device This may be for example achieved

by incorporating a damping restriction in the hydraulic porting of the device

4.2.5 Automatic elastomeric to pneumatic converter

4.2.5.1 The load from the vehicle suspension applied mechanically to the empty-loaded changeover device shall result in a change in state of the device as a consequence of a change in load on the elastomeric element within the device This change of state shall occur at a defined value of vehicle mass (changeover mass) and result in a step change in the pneumatic output signal pressure as in 4.2.3

4.2.5.2 The design shall incorporate a method of ensuring that normal transient movements of the vehicle suspension do not affect the state of the empty-loaded change over device This may be for example achieved by elastomeric characteristic of the device

4.2.6 Components for operation of the manual empty-loaded changeover device

4.2.6.1 When a vehicle is fitted with one “empty” brake system and one or several “loaded” brake systems, changeover from one system to another shall be made by means of a cranked lever moving perpendicular to the axles See Figure B.1 for an example

4.2.6.2 Operation of the manual empty-loaded changeover lever shall either act directly on a mechanical linkage causing a change of lever ratio, or effect a changeover of a mechanical linkage via a pneumatic device fitted to the mechanical lever arrangement

4.2.6.3 For the “loaded” brake system corresponding to the changeover mass, the lever shall be inclined towards the top on the right, making an angle of at least 90° with the “empty” position

4.2.6.4 For the “empty” brake system, the changeover lever shall be inclined towards the top on the left

and occupy its extreme position on the left

4.2.6.5 The lever position corresponding to more than one "loaded" position shall be between those

stated in 4.2.6.3 and 4.2.6.4 and increasing in power as from the left

4.3 Vibrations and shock

The design of the empty-loaded changeover device and its installation on the vehicle shall ensure that outside influences, e.g impacts and jolts, in no way affects the correct function of the device The empty-loaded changeover device shall be able to operate without restriction under vibration and shock conditions as specified by EN 61373:1999, Category 1, class A or B or Category 2, dependant on the installation location for which it is designed This requirement shall be tested in accordance with 6.2.10

4.4 Environment

4.4.1 General

The design shall take into account that the empty-loaded changeover device shall be able to be put into service and operate normally in the conditions and climatic zones for which it is designed and in which it is likely to run, as specified in this European Standard

NOTE 1 The environmental conditions are expressed in classes for temperature etc thereby giving the vehicle designer the choice of an empty-loaded changeover device suitable for operation on a vehicle all over Europe, or have a restricted use

NOTE 2 The environment range limits specified are those that have a low probability of being exceeded All specified values are maximum or limit values These values can be reached, but do not occur permanently Depending on the situation there can be different frequencies of occurrence related to a certain period of time

The empty-loaded changeover device shall be tested in accordance with the requirements given in Clause 6 including where required environmental/climatic testing

4.4.2 Temperature

The empty-loaded changeover devices covered by this European Standard shall be able to operate:

 at – 25 °C ≤ environmental temperature ≤ 70 °C without any deviation from the technical requirements specified in this European Standard;

 at – 40 °C ≤ environmental temperature < – 25 °C without deviation from the main technical requirements specified in this European Standard but without affecting the function of the empty-loaded changeover device

Deviations from the technical requirement when testing at extremes are defined in 6.2.11

The purchaser can specify a higher or lower temperature limit values if operational constraints demand it In this case the temperature limit values used in the extreme temperature tests of 6.2.11 shall be changed accordingly

4.4.3 Other environmental conditions

It shall be demonstrated that these environmental conditions have been taken into account in the design of the empty-loaded changeover device It is sufficient for the supplier to make a declaration of conformity stating

how the environmental conditions in the following clauses have been taken into account

If not specifically required to be tested as part of the type testing requirements in Clause 6, suitable tests and/or design assessments considering the effect of the following environmental conditions on the empty-loaded changeover device, shall be used in the development/design proving of the empty-loaded changeover device, prior to type testing

4.4.3.2 Altitude

The empty-loaded changeover device shall be able to operate without restrictions up to an altitude of 2 000 m

4.4.3.3 Humidity

The following external humidity levels shall be considered:

 yearly average: ≤ 75 % relative humidity;

 on 30 days in the year continuously: between 75 % and 95 % relative humidity;

 on the other days occasionally: between 95 % and 100 % relative humidity;

 maximum absolute humidity: 30 g/m3 occurring in tunnels

An operationally caused infrequent and slight moisture condensation shall not lead to any malfunction or failure

The psychometric charts contained in EN 50125-1 shall be used to establish the range of variation of the relative humidity for the different temperature classes that it is considered will not be exceeded for more than

30 days per year

At cooled surfaces, 100 % relative humidity can occur causing condensation on parts of equipment; this shall not lead to any malfunction or failure

Sudden changes of the air temperature local to the vehicle can cause condensation of water on parts of equipment with rate of 3 K/s and maximum variation of 40 K; these conditions particularly occurring when entering or leaving a tunnel shall not lead to any malfunction or failure of the equipment

4.4.3.4 Rain

Rain rate of 6 mm/min shall be taken into account The effect of rain shall be considered depending on the possible equipment installation together with wind and vehicle movement

4.4.3.5 Snow, ice and hail

Consideration shall be given to the effect of all kinds of snow, ice and/or hail The maximum diameter of hailstones shall be taken as 15 mm, larger diameter can occur exceptionally The effect of snow, ice and hail shall be considered depending on the equipment installation together with wind and vehicle movement

severity of pollution can depend upon the location of the equipment therefore the effects of the kinds of pollution indicated in Table 1 shall be considered as a minimum

Table 1 — Pollution

Chemically active substances Class 5C2 of EN 60721-3-5:1997

Contaminating fluids Class 5F2 (electrical engine) of EN 60721-3-5:1997

Class 5F3 (thermal engine) of EN 60721-3-5:1997 Biologically active substances Class 5B2 of EN 60721-3-5:1997

Dust Class 5S2 of EN 60721-3-5:1997

Stones and other objects Ballast and other objects of maximum 15 mm diameter

Sand Class 5S2 of EN 60721-3-5:1997

Sea spray Class 5C2 of EN 60721-3-5:1997

4.5 Compressed air quality

It shall be possible to operate the empty-loaded changeover device without restrictions with at least the compressed air quality according to the following classes defined by ISO 8573-1:2001:

 class 4 – for the maximum particle size and the maximum concentration of solid contaminants;

 class 4 – for the water dew point;

 class 4 – for the maximum total (droplets, aerosols and vapours) oil concentration

The empty-loaded changeover device shall be capable of operating in an air supply system that is not fitted with an air dryer, or when the air dryer is out of order The air system should therefore include some means of preventing water collecting within the empty-loaded changeover device and hence freezing of the water in conditions below 0 °C

NOTE The service life of the empty-loaded changeover device is a function of the environment/operating conditions

in which the empty-loaded changeover device will function, and the requirements for the empty-loaded changeover device

to achieve a serviceable life in accordance with the maintenance requirements of the vehicle to which it is fitted

empty-in accordance with 6.2.4

4.9 Design requirements regarding pressure stress

The design of the empty-loaded changeover device shall allow safe required performance with a maximum supply pressure of 10 bar It shall be taken into consideration that the maximum supply pressure can be reached in other pneumatic circuits of the empty-loaded changeover device when the present standard requires such a function

At an environmental temperature of – 25 °C, also at + 70 °C, the empty-loaded changeover device shall not have a leakage rate of greater than 0,01 Nl/min when tested at a pressure of 6 bar This requirement shall be tested in accordance with 6.2.11.2

At – 40 °C ≤ environmental temperature < – 25 °C an empty-loaded changeover device shall have a leakage rate of not greater than 0,1 Nl/min when tested at a pressure of 6 bar in accordance with 6.2.11.2

4.11 Interfaces

4.11.1 Mechanical

The interface of the empty-loaded changeover device to the vehicle shall be via a mounting bracket The connectors shall be suitably sized to meet the physical loadings identified in this European Standard The interface of the bracket is dependant on the individual design of the empty-loaded changeover device

4.11.2 Pneumatic

Connection of the pneumatic supply input to the empty-loaded changeover device and the pneumatic signal output from the empty-loaded changeover device, to the vehicle pipework, shall be achieved using a threaded connection of size G1/4 to EN ISO 228-1

5 Materials

The selection of the material and the manufacturing process are left to the discretion of the manufacturer, however they shall comply with the requirements of this European Standard, technical specification and/or the relevant design drawings

The type tests shall be conducted on individual empty-loaded changeover devices

All the test requirements shall be achieved to obtain type test compliance

For manual empty-loaded changeover devices the type test in 6.2.4 shall be carried out Further functional type testing of manually operated changeover devices is not required as these devices operate on the associated vehicle installation and their operation is subject to that installation The correct operation of manually operated empty-loaded changeover devices shall be tested on the vehicle

6.2 Individual automatic empty-loaded changeover device type tests

6.2.1 Test bench for individual automatic empty-loaded changeover device type tests

The type tests shall be performed on a test bench specifically designed so that all the requirements given by this European Standard for the testing of an empty-loaded changeover device can be performed and compliance with the requirements of 4.2 confirmed

The test bench arrangement shall include:

1) precision pressure reducing device;

2) supply pressure isolating cock;

3) supply pressure vent cock;

4) supply pressure test gauge;

5) automatic empty-loaded changeover device;

6) load signal pressure (Lsp) isolating cock;

7) load signal pressure (Lsp) vent cock;

8) load signal pressure (Lsp) test gauge;

9) reservoir

A diagram of a typical test bench arrangement consisting of the above constituent parts which should be used

is shown in Annex C

All pipe volumes and reservoir volumes shall be such that all requirements are achieved

The capability of the test bench arrangement to meet the requirements of the type test procedure shall be verified by the manufacturer

The test bench arrangement may be used for both ambient and extreme temperature testing when used in association with a thermostatic enclosure

The measuring instruments used on the test bench shall be calibrated and have a maximum deviation of 0,02 bar for the pressure measurement

The pipe volumes of the test bench shall be known in order to allow calculation of the leakage rates

A suitable air supply shall be provided with a maximum supply pressure of 10 bar

The test bench leakage rate shall not be greater than 0,000 1 Nl/min

The method of operating the automatic empty-loaded changeover device i.e achieving movement of the operating mechanism is at the discretion of the manufacturer, but shall provide sufficient movement capable of confirming the empty-loaded changeover devices operation The movement required to operate the empty-loaded changeover device may vary dependant on the design requirements of the individual type of empty-loaded changeover device under test

6.2.2 Sampling for type tests

A sample of ten (10) empty-loaded changeover devices shall be taken from the normal production

6.2.3 Test requirements

All the type tests except the type tests of 6.2.11, shall be performed at ambient temperature (20 ± 5) °C All type tests shall be performed with a minimum air quality of the compressed air of class 4-4-4 specified in ISO 8573-1:2001

It is acceptable for the tests to be conducted with a static force or a varying force with a peak-to-peak value of

15 % to 30 % of the nominal force at a frequency of 3 Hz

The tests on the sample of ten (10) automatic empty-loaded changeover devices shall be carried out in the order shown in Table 2

Table 2 — Sample testing Tests

Corresponding standard sub- clause

Tested empty-loaded changeover device number

Physical and geometrical

characteristics 6.2.4 X X X X X X X X X X

Operation empty to loaded 6.2.6 X X X X X X X X X X

Operation loaded to empty 6.2.7 X X X X X X X X X X

Response empty to loaded 6.2.8 X X X X X X X X X X

Response loaded to empty 6.2.9 X X X X X X X X X X

6.2.4 Check of physical and geometrical characteristics

6.2.4.1 Procedure

In accordance with the particular order documentation and approval drawings, dimensional accuracy shall be verified by means of appropriate measuring instruments and form gauges e.g threaded connections may be checked using GO/NOT GO gauges in accordance with EN ISO 228-2 The external surfaces shall be checked for sharp edges and corners

With vent cocks and load signal pressure isolating cock closed, open the supply pressure isolating cock and using the precision pressure reducing device set the supply pressure to (6 ± 0,15) bar as shown on the supply pressure test gauge

Open the load signal pressure (Lsp) isolating cock and wait 1 min for pressure settlement then observe any increase or loss of pressure on the load signal pressure (Lsp) test gauge

6.2.5.1.2 Pass/fail criteria

Any pressure increase shall not be greater than an equivalent leakage rate of 0,005 Nl/min

6.2.5.2 Zero load signal pressure devices

6.2.5.2.1 Procedure

Mount the empty-loaded changeover device to the test bench positioned to receive the supply pressure and output a load signal pressure to the reservoir volume The device operating mechanism shall be at its extended position

With vent cocks and load signal pressure isolating cock closed, open the supply pressure isolating cock and using the precision pressure reducing device set the supply pressure to (6 ± 0,15) bar as shown on the supply pressure test gauge

Open the load signal pressure (Lsp) isolating cock and wait 1 min for pressure settlement then close the

supply pressure isolating cock and observe the load signal pressure as shown on the load signal pressure

(Lsp) gauge

6.2.5.2.2 Pass/fail criteria

Any pressure loss shall not be greater than an equivalent leakage rate of 0,005 Nl/min