Preview on PRV – Valve Action VS Inlet Pressure;

Operation (open – closed) Pressure Relief Valve (PRV) compared to the pressure in the system (Inlet Pressure of PRV) describing as below chart:

To understand above actions, firstly see the relationship of pressure levels and the definition of each acting term:

Pressure Level Relationships chart

Then, how to test the valve correctly by below topics:

What is PRV pop test? (Popping test)

What is PRV Seat leakage (tightness) test?

What is Backpressure testing of PRV?