Hidria Air flow control units

Overpressure dampers are used to equalize the pressure between adjacent rooms and for automatic interruption of air supply or air exhaust. Volume control dampers regulate the air flow volume in ventilation ducts and air conditioning devices. Throttling, shut off and non return dampers and flow rate controllers are used for control the air flow volume in ventilating ducts.

08

Overpressure dampers are used to equalize the

pressures between adjacent rooms and for automatic

interruption of air supply or air exhaust

Volume control dampers regulate the air low volume in

ventilating ducts and air conditioning devices

Throttling, shut-off and non-return dampers and low rate

controllers are used for control the air low volume in

■ Overpressure dampers

Overpressure dampers are used to

equalize the pressures between adjacent

rooms and for automatic interruption of

air supply or air exhaust Steel (Types JNŽ)

or aluminium (Types ANŽ) overpressure

dampers can be produced

Volume control dampers regulate the air

low volume in ventilating ducts and air

conditioning devices We produce several

construction types with manual, motor or

pneumatic regulation

return dampers, low rate

Throttling, shut off and non return dampers

Mechanical low rate controllers

Overpressure dampers

MRP-2

Page

Louvre for maintaining the preset pressure difference JNŽ-6W 299

Overpressure dampers are used in all

kinds of low pressure air conditioning,

air heating ind ventilation, where it

is necesary to equalise the pressure

between adjacent rooms They can be

applied where the automatic break of

the supply and exhaust air is required

after conditioning-, heating- or ventilation

device has been turned off

Description

Overpressure dampers consist of

supporting frame made of galvanized

sheet steel (steel overpressure dampers

JNŽ-6) or aluminium section anodised

in natural aluminium colour (aluminium

overpressure dampers ANŽ-3 and

ANŽ-4) and horizontal swinging vanes

of sheet aluminium The horizontal

vanes are inserted into plastic bearings,

temperature resistant to 80 °C Sealing

stripe, attached on lower part of vanes

reduces noise

Caution

In the cases of effective velocities

exceeding the values provided in the

diagram of the determination of the

total pressure drop on page 14, or in the

cases of a likely exposure of the louvres

to strong wind gusts, we recommend the

installation of a constraint crossbar

Sizes:

All combinations of B1 and H1 according

to the table of dimensions are possible

Non-standard dimensions are available on

Overpressure damper is fastened in

built-in frame of angle steel

Designation: JNŽ-6/3

Overpressure damper is fastened

on duct Connection accessoriesare not supplied

Designation: JNŽ-6

Overpressure damper is fastened in built-in frameDesignation:

1 2 3 4 5 6 0.5

5

20 30 40 50 80

10 100

Steel overpressure damper

Aluminium overpressure damper

Pressure drop diagram

Use the diagram to determine the total pressure drop in

respect of air velocity at the free sectional area

B1 B1+76

B1 B1+76

The JNŽ-6W louvre for maintaining the preset pressure difference

is designed for maintaining the preset pressure difference between

two rooms or between indoors and outdoors Depending on its

orientation, the louvre can support overpressure or underpressure

It is a rapid-response precisely adjustable passive element for

maintaining the pressure difference and is not airtight Standard

dimensions: from 200x100 to 1000x1000 with 50 mm steps Other

dimensions available upon request

It can be used as

• an underpressure louvre – to prevent the egress of

substances (chemicals, smoke, etc.);

• an overpressure louvre for rooms where preventing the

ingress of polluted air is desired;

• an overpressure valve – to prevent the ingress of gases

into smokeless areas

Description

• The blades are interconnected using connecting rods

• Precise adjustments are performed on-site

• Easy to set up: weights are placed on the threaded rods

and secured against unscrewing using nuts

Size JNŽ-6WH1 (mm) 100 150 200 250 300 400 500 600 700 800 900 1000

n – number of vanes

Sizes

All combinations of B1 and H1 according to the table of

dimensions are possible Non-standard dimensions are

Air velocity (m/s) at the effective area Aef

Use the diagram to determine the total pressure drop in respect

of air velocity at the free sectional area

Aef = B1 x (H1-10-(13 x n)) in m²

where n is a number of vanes

Pressure drop diagram:

B1 B1+76

Volume control dampers are designed

for regulation of air low and pressure

in ventilating ducts and air handling

units They are installed as independent

devices or combined with protection- or

overpressure louvers

Description

They are made of galvanised sheet

steel Volume control dampers consist

of supporting frame and interconnected

blades Blades are inserted into

PVC – bearings When operating by

temperatures, higher then 70° C bearings

are made of brass Blades can be moved

manually or by the means of the electric

actuator Pneumatic control is also

• Galvanised supporting frame RŽ-1A/3

• Control handle is attached to the blade which is

closer to the centre (from the top side)

Volume control dampers

180 B1

B1+76 H1+76 H1

B1 B1+76

• Same design as RŽ-1A or RŽ-1B

• Heaters built in blades

• Operation thermostat 0-40 °C

• Temperature limitter 85 °C

• Manual or motor control

• Heater capacity depending on the dimension

Type RŽ-2

• The same construction as RŽ-1A

• Special sealing stripe between blades as well as between

Blades and frame

• Air-tight construction

B1 B1+80

• Type A parallel blades

• Type B counterdirectional blades

• Blade made of sectional sheet steel

• Bearings made of PVC or brass (higher

operating temperatures)

All combinations ob B1 and H1 according to the

table of dimensions are possible

Volume control dampers RŽ-1/A and RŽ-1/B are

available in all sizes

Manual control with handle

• Mechanism for locking selected

position

• Type RŽ-1/R

Pneumatic control with cylinder

• Operating pressure 1.2 or 6 bar

• Type RŽ-1/P

Motor control with electric actuator

• Control via the electric actuator ding to the table of motor actuators on page 333

Direct installation in duct

Fastening accessories are not

Designation: RŽ-1, 2/3

250 250

125 125

35/35/4 75/35/2

Hole arrangement on dampers RŽ-1A, B and RŽ-2:

Hole arrangement on dampers RŽ-3:

Ordering exampleVolume control

Installation of volume control dampers of larger dimensions:

Combinations according to the width:

Connection frame supplied as per order

Dimension upon customer’s request

B12/J12 Actuator GM 230A / DAG 2B13/J13 Actuator GM 24A SR (continuous regulation) / DMG 1.1

P Pneumatic control

3 Installation frame/ Without installation frame

G Heaters built in blades

A Parallel blades

B Counterdirectional blades

1, 2, 3 Type of the volume control damper RŽ

Ordering exampleVolume control

Combinations according to the height:

Connection frame supplied as per order.Dimension upon customer’s request.H2 = (2xH1) + 76

RŽ-1 A / G / 3 / R B1 x H1

Note:

The range of applicability of individual actuators – see table on page 333

l o k

L W (dB(A))A

) s / m ( v a k a r z t s o rt H

e l e m a

l o k

L W (dB(A)) kot lamele

7 0 80

l o k

Blade angle

Blade angle Blade angle

1 Frame of extruded aluminium sections.

2 Bar of aluminium sections (installed by B>1200 mm)

3 Blade made of extruded aluminium sections

4 Plastic gear wheel

5 Handle for manual control and locking made of aluminium alloy

6 Rubber sealant

Application

Volume control dampers are designed

for regulation of air low and pressure in

ventilating ducts and air handling units

Description

Frame and blades are made of extruded

aluminium sections Blades are inserted

in plastic bearings They are driven via

the plastic gear wheels, ixed in the frame

section with plastic holders Mechanism

is encased in separate housing and

therefore protected from dust ant other

inluences A rubber strip attached on

blades provides better sealing Blades

open in opposed direction only The

dampers can be regulated manually

(standard version) or power operated by

pneumatic or electric actuator Volume

control damper is temperature resistant

SM 24 SM 220

C A 0 C

A 4

2 3

Manual control with handle and locking

output power (see page 46) Continuous

control and blades position of 0° – 90°

is achieved with actuators SM 24-SR or

WA 50 60 70 80 90

Volume control damper sealing:

Closed volume control damper of 1 m²

area has a leakage of approx 50 m³/h at

the pressure of 100 Pa

(Standard DIN 1946 permits leakage of

If after the end of the operation we want to prevent the invasion

of external air into the system, the combination of an

overpres-sure damper with steel or aluminium protection louvres can be

used The A variant is used for the outtake of air, whereas the B

variant is intended for its supply The starting point can be the

dimension of the overpressure damper or the dimension of the

protection louvre It is important for the dimensions to be in the

same proportion, which is evident from the draft

Louvres and dampers are available separately or combined, as

desired

AZR-4 with Overpressure damper JNŽ-6

Type A

Exhaust air

Type B Supply air

AZR-4 with Volume control damper RŽ-1

Throttling damper is designed for

regulation of air low volume It is

constructed to it square ducts

Description

Damper consists of housing and blade,

both made of galvanised sheet steel and

mechanism for altering the blade angel

All dampers can be outside insulated

100 200 300 400 500 1000 2000 3000 5000 10000 15000

B=125

H=125 160

160 200

Pri kotu lamel 0° je padec tlaka zanemarljiv.

DL / R B1 x H1

Deinition of symbols

Pressure drop with 0° blade angle is negligible

Throttling damper is designed for

regula-tion of air low volume It is constructed to

it round and spiro ducts

Description

Throttling damper consists of housing and

blade, both made of galvanised sheet

ste-el and mechanism for altering the blade

angel All dampers can be insulated

On the outer side, DL-2 is itted with a

J2 Actuator DAN 2.N (230 V)J3 Actuator DMN 1.2N (24 V continuous regulation)

1, 2 Throttling damper type

-

0

Pressure drop diagram

25 25

Shut-off dampers ZL-1 and ZL-2 are used

to close the air supply or air exhaust in

ventilating systems which require high

level of sealing and very pure air Mainly

they are used in systems itted with

abso-lute ilters

During the operation, ilters soil, causing

the pressure drop to increase If constant

air low through the ilter is to be ensured,

pressure drop must be compensated

Ab-solute ilters are usually constructed with

the initial pressure drop pZ (on a new

ilter) of 140 or 250 Pa When pressure

drop reaches the double value of initial

pressure drop, ilter is to be replaced To

compensate the pressure difference

ad-just the shut-off damper to obtain the total

pressure drop on the ilter and damper

pcel which equals double initial pressure

drop on absolute ilter

When pressure drop on the ilter

increa-ses, open the shut-off damper to keep the

pressure pcel constant (2 x pZ)

When replacing absolute ilters, ducts

must be sealed tight Shut-off dampers

are produced according to DIN 1946

Description

Shut-off dampers consist of housing and

blade, both made of galvanised sheet

steel, rubber sealant brass bearings

and control mechanism Damper can be

manually controlled or by the means of

electric or pneumatic actuator In case

damper is manually controlled, locking

mechanism is attached

On the outer side, ZL-2 is itted with a

rubber seal

size 100 size 150

size 350 size 400 size 500

Version with electric actuator

BELIMO or JOVENTA electric actuators are

installed (see page 333)

Recommended:

• Up to size 200: actuator SM (15 Nm)

• Larger dampers: actuator GM (30 Nm)

Pressure drop and sound power level diagram

R Manual control

B Power driven but without actuatorB4/J4 Actuator NM 24A / DAS 1.NB5/J5 Actuator NM 230A / DAS 2.NB6/J6 Actuator NM 24A-SR / DMS 1B7/J7 Actuator SM 24A / DA 1B8/J8 Actuator SM 230A / DA 2B9/J9 Actuator SM 24A SR (continuous regulation) /

DM 1.1

P Pneumatic controlB10/J10 Actuator SM 230A SR/DM 2.2

1, 2 Shut-of damper type

Non-return dampers are designed for

au-tomatic shut-off of ducts after ventilator

is turned off Springs are constructed in

the way to cause only a negligible

pressu-re drop at damper Non-pressu-return dampers

are designed for installation in round

Description

They consist of housing made of

galvani-sed sheet steel and blades of thin sheet

aluminium Springs from stainless steel

return the lap to closed position

With the circular air low controllers with automated action, the

air low rate is controlled via an asymmetrical control lap pivoting

on a smoothly running bearing, so as to provide highly sensitive

response and control even with low low rates Manual low rate

setting is also available, by adjusting the tension of the drawing

spring according to a scale denoting the desired low rate In

selecting the controller and sizing of the ducting, the minimum

air low velocity of 2.7 m/s should be ensured

Application

These controllers are designed to control air low rate in circular

duct systems

Material

Mechanical low rate controllers MRP-1 are made of galvanised

steel sheet They are laser butt-welded to eliminate sharp seams

both inside and outside The joining ends are calibration pressed

in conformance with DIN 24147 to provide their extreme stability

and accurate itting Cushioned control lap: a piston damper

prevents vibrations and oscillations of the control lap On order,

mechanical air low rate controllers are also available with 25 or

50 mm acoustic or thermal insulation

Installation

The controller can be installed at any location of the ventilation

system Access to the ducting and the controller shall be provided

in conformance with DIN 1946 T2, for the purposes of actuation

and maintenance A minimum 3xL length straight duct section

shall be provided on both sides of the controller, to ensure low

stabilisation and eficient controller operation Inlet and outlet

ducting sections should be of equal diameter The indicated

refe-rence air low velocity is approx 4.5 m/s Air low velocity should

be within the range of optimum low rate A circular rubber seal

provides secure sealing, since the gap between the duct section

and the joining end of the controller is thus equalised and kept

constant by the weights of joining components

Standard Designs

Constant low air low rate controller with tight insertion seating

(joint dimension only):

1 Automatic control autonomous of external energy sources,

with basic factory settings or user selected settings of

referen-ce air low rate;

2 Optional post-installation setting, by means of the setting

device;

3 Maximum pressure drop across the controller 1000 Pa;

4 Special controller variants available, without the setting

devi-ce, for unobtrusive installation, suitable for installation in open

ducting (this design, however, does not allow low rate setting

after installation);

5 L1 = length of the insertion section, total length = L1 + 2 × L2

Examples of installation Recommended straight

ducting sections L

≥ 2.5D

≥ 3D

≥ 3Dm

Mechanical low-rate controllers