What is Backpressure, Superimposed Backpressure?

Backpressure of PRV; 

Backpressure is the pressure on the outlet side of the Pressure Relief Valve (PRV) which will affect the operation. Performance of PRV by Backpressure contains Superimposed backpressure and a Built an up backpressure:

What is Backpressure of valve.png

Superimposed Backpressure of PRV;

Superimposed Backpressure is a static pressure on the outlet side of Pressure Relief Valve (PRV). There are both Constant and Variable.

What is Backpressure of  PRV 2.png

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