Superimposed Backpressure

Written by Jerry Ratzlaff on . Posted in Valve

Superimposed backpressure is the pressure that is on the discharge side of a pressure relief valve (PRV) when the device is required to operate.  It is a result of pressure in the discharge system coming from another source.  This pressure may be constant or variable.  It could be pressure caused by another PRV that is relieving at a lower pressure if the PRV is discharging into a common relief system. 

Tags: Valve Terminology