pilot operated relief valve

Pilot operated pressure relief valve is a kind of pressure relief valve which is composed of main valve and pilot valve. Pilot valve senses the system pressure and controls the opening and closing of main valve by its own action.

Product Range

Inlet Flange Pressure: 150Lb-2500Lb

Available Material: WCB, CF8, CF8M, CF3M,LCB

Technical Specifications:

ISO 4126-4: Safety Devices for Protection Against Excessive Pressure Part 4:Pilot-operated Safety Valves

API STD 526: Flanged Steel Pressure Relief Valves

API STD 527: Tightness of Pressure Relief Valves

ASME, Boiler and Pressure Vessel Code,Section VⅢ Division 1, Rules for Construction of Pressure Vessels.

Features of Pop Action pilot operated pressure relief valve

1. The system can be operated nearest set pressure without valve leakage.

2. The soft seat design provides good seat tightness before and after each relief cycle.

3. Proper valve operation and lift are unaffected by back pressure

4. No more over pressure required for full lift of main valve.

5. Non-flowing pilot reduces product loss and environmental pollution

6. Externally adjustable blowdown

7. Quick simple verification of set pressure while valve remains in service.

Features of Modulating pilot operated pressure relief valve

1. It opens in proportion to the over pressure to minimize product loss and reduce noise

2. Reduces shock loads on vessels and piping due to valve actuation,

3. The system can be operated nearer set pressure without valve leakage

4. The soft seat design provides good seat tightness before and after each relief cycle

5. Proper valve operation and lift are unaffected by back pressure

6. Non-flowing pilot reduces product loss and environmental pollution

7. The pilot exhaust is piped to the vent pipe line without being influenced by the back pressure.

8. Quick simple verification of set pressure while valve remains in service.