Pressure Rrelief Valve

 More Product Parameters:
A) The allowable tolerance of the set pressure:≤±3% of the set pressure.
B)Overpressure:≤10% of the set pressure.  C)Blowdown:≤ 10% of the set pressure .
D)Tigtness: The valve have good seat tightness ,conforms to API Std 527.

Specifications:
1.The soft seat design provides good seat tightness before and after each relief cycle.
2.The system can be operated nearer set pressure without valves leakage.
3.No more overpressure required for full lift of main valve.
4.Proper valve operaion and lift are unaffected by back pressure.
5.Quick simple verification of set pressure while valve remains in service.

More products description :
In the normal closed position,sysytem pressure is transmitted throught the pilot valve and into the dome of main valve.The pressure above the main valve disc generates net downward force.hold the main valve closed.When system pressure reaches the set pressure.the pilot spindle lifts and reseat piston closed simultaneously,venting the dome pressure throught the pilot valve to atmosphere.Because of system pressure remains above reseat pressure,the reseat piston is held tightly closed,blocking flow to the pilot valve.at this time the dome pressure of main valve is depressed quickly,allowing the main valve to open fully.