Relief Valve Spring

[nickypaliwal]

I have mostly seen relief valves with non-wetted spring. However there are designs in which spring is wetted.

What is the basic difference in the usage (service wise eg Gas/liquid etc) or applicability wise? How do we know that which one has to be used?

 

[MikeHalloran]

Relief valves are usually designed for a specific service, e.g. water heater overpressure, fuel gas, compressed air, engine lube oil, whatever.

The totality of the parameters of each environment affects every facet of an appropriate valve's design, including material selection and geometry at least. Obviously, a wetted spring might be acceptable where the working fluid is guaranteed to not corrode or otherwise affect the spring. There might be third parties who would also have something to say about design features, e.g. AWWA, API, ABS, or others.





Mike Halloran
Pembroke Pines, FL, USA