Pressure Relief or Sustaining Valve

CONTROL AUTOMATIC PRESSURE RELIEF OR ORSUSTAINING

شیر فشار شکن - کنترل ورودی

Pressure Relief or Sustaining Valve

DN:50-1000 mm | PN: 10-40 bar

Nahrab piloted automatic control valves are used as control and regulating valves in lines. The operation of these valves is fully automatic and is controlled by the flow of fluid and does not require the application of energy from outside. In order to regulate the flow or pressure, a hydraulic circuit with a pressure difference across the valve and regulating valve (pilot) is used, The command circuits of Nahrab control valves are state to the art and made of the best stainless steel and all of its various pilots are also produced by Nahrab Gostar Eshtehard Company. Using the stainless steel unions with a nipple and connector assembly makes it possible to inspect or open and close the valve at any moment and any section without the need for a sealing strip.

DN: 50 - 50
mm
PN: 10 - 10
Bar

Nahrab  piloted  automatic control valves are used as control and regulating  valves in lines. The operation of these valves is fully automatic and is controlled by the flow of fluid and does not require the application of energy from outside. In order to regulate the flow or pressure, a hydraulic circuit with a pressure difference across the valve and regulating valve (pilot) is used, The command circuits of Nahrab  control valves are state to the art and made of the  best stainless steel and all of its  various pilots  are also produced by Nahrab Gostar Eshtehard Company. Using the stainless steel unions with a nipple and connector assembly makes it possible to inspect or open and close the valve at  any moment and any section without the need for a sealing strip.

 

Specifications and advantages of Nahrab gostar  automatic control valves

  • Easy installation due to the low weight of the valve
  • Flange: in accordance with (2501 DIN) EN 1092-2
  • Face to face: according to (DIN 3202) DIN EN 558-1 Series1) F1
  • Final test of valve in accordance with DIN EN 12266-1

 

Corrosion Protection :

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

Pressure relief valve

This valve prevents pressure rise in the pipelines If the pressure in the pipeline is greater than the pressure set on the pilot installed in the valve control circuit, the valve will open automatically and drain the required amount of water out of the system to relieve pressure.

  • If the relief valve is installed between the upstream and downstream of the areas at high altitudes, it maintains the minimum pressure of the upstream to prevent it being over shadowed .
  • This pump is installed After the outlet, and when pump is shutdown, it prevents water surge and discharges the excessive pressure to environment and closes gently.
  • It is installed to increase the pressure at the outlet of the pumps and causes a change in the pump point, increasing the efficiency and life of the pump.

Spare Parts

Material

Part Name

Part No.

 

Ductile iron) GJS 400-15)*

Body

1

 

Ductile iron) GJS 400-15)*

Cover

2

 

1.4308

Seat

3

1.4301

Stem

4

EPDM or NBR

Sealing Ring

5

 

Ductile iron) GJS 400-15)

Disc

6

EPDM or NBR

Diaphragm

7

 

Ductile iron(GJS 400-15) or Al.Bz

Diaphragm Washer

8

1.4310 | 1.4301

Spring

9

 

1.4308

Disc Guide

10

A2

Stem Nut

11

1.4310 | Bronze

Cover Bearing

12

EPDM or NBR

Seat O-Ring

13

 

A2) 10inch and Larger)

Stud

14

 

A2

Hex Nut (10” and Larger)

15

A2

Pipe Plug

16

PTFE

Spacer Washer

17

 

A2

Cover Bolt (6” and Smaller)

18

They can also be produced with stainless steel or cast steel (WCB) as request

Technical drawings of this valve will be Uploaded soon