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Arelief valveorpressure relief valve(PRV) is a type ofsafety valveused to control or limit thepressurein a system;pressuremight otherwise build up and create a process upset, instrument or equipment failure, or fire.This valve can be adjust from 0 to 100 PSI simply by rotating the knob at the end. As the knob rotates a graph underneath is exposed showing you what PSI it’s currently set to.