Vacuum Breaker Valve

AIR VALVES

شیر هوای خلاء شکن

Vacuum Breaker Valve

DN:100-1000 mm | PN: 10-63 bar

Air must be injected into the system in large quantities for any reason, such as pipe breaking and accidental discharge, to prevent lines from being damaged and crumpled during uncontrolled fluid outflow. Nahrab Gostar vacuum breaker valve is installed after the Excess Flow Shut – Off Valves and injects the required air into the pipeline to eliminate the vacuum. The operation of this valve is such that under normal conditions, when there is a positive pressure in the pipeline, the valve is completely closed and when the line pressure reaches negative -0.1 bar, the valve starts to open and at a pressure of -0.2 bar , the valve is fully open and air enters the pipeline with the maximum required flow. A spring-loaded piston cylinder system is used to adjust the closing speed to prevent shock when the disc closes and also to increase the reliability to prevent the vacuum breaker valve from quick closing.

DN: 100 - 100
mm
PN: 10 - 10
Bar

Application:

Air must be injected into the system in large quantities for any reason, such as pipe breaking and accidental discharge, to prevent lines from being damaged and crumpled during uncontrolled fluid outflow. Nahrab Gostar vacuum breaker valve is installed after the Excess Flow Shut – Off Valves and injects the required air into the pipeline to eliminate the vacuum. The operation of this valve is such that under normal conditions, when there is a positive pressure in the pipeline, the valve is completely closed and when the line pressure reaches negative -0.1 bar, the valve starts to open and at a pressure of -0.2 bar , the valve is fully open and air enters the pipeline with the maximum required flow. A spring-loaded piston cylinder system is used to adjust the closing speed to prevent shock when the disc closes and also to increase the reliability to prevent the vacuum breaker valve from quick closing.

Features and Advantages of Nahrab Gostar air valves:

  • Flange dimensions according to DIN EN 1092-2 (DIN 2501)
  • Face to Face distance of flanges according to DIN 558-1 ( DIN 3204-F4 )
  • Final testing of valves according to DIN EN 12266-1

Corrosion Protection :

Electrostatic  epoxy powder Coating  with a  min  thickness  250   , certified by reputable international institutions for potable water.

Spare Parts

Material

Part Name

Part No.

 

St 37-2

Body

1

 

St 37-2

Flange

2

 

AISI 304

Seat

3

NBR or EPDM

Seat Ring

4

 

St 37-2

Disk

5

 

St 37-2

Piston

6

 

AISI 304

Cylinder

7

 

X20cr13

Steam

8

 

X20cr13

Cylinder Ratainer Arms

9

 

Flow Control

10

 

Al.Bz

Bushing

11

 

1.4310

Spring

12

 

St 37-2

Spring Support

13

 

St 37-2

Drain

14

 

Ductile Iron (GJS 400-15)

Gate Valve

15

 

Ductile Iron (GJS 400-15)

Air Valve

16

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