Excess Flow Shut- off Valve

CONTROL AUTOMATIC EXCESS FLOW SHUT-OFF

شیر قطع کن اضطراری

Excess Flow Shut- off Valve

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

Nahrab piloted automatic control valves are used as control and regulating valves in the line. 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 a 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 any sealing strip

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

Nahrab  piloted  automatic control valves are used as control and regulating  valves in the line. 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  a 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 any sealing strip

 

Product features and advantages:

 

  • Easy installation due to the low weight of the valve
  • Flanges: 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.

Excess Flow Shut – Off Valve

These valves are used to protect the pipeline by preventing the storage tanks discharge to the downstream in the event of bursting or breaking of line due to accident or natural disasters such as flood and earthquake. This valve is sensitive to the flow rate and is activated due to the increase in water velocity in the pipeline to close and shut off the flow. The flow circuit of this valve can be adjusted and calibrated for different speeds. It is necessary to mention that the installation of a double -orifice air valve in the valve downstream is necessary to let air flow into the pipeline during the operation of the valve. These valves are often installed at the outlets of pipeline tanks.

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

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