Excess Flow Shut- off Valve
CONTROL AUTOMATIC EXCESS FLOW SHUT-OFF
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
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
Technical drawings of this valve will be Uploaded soon