Difference between PSV & PRV

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Both pressure relief valves (PRV) and pressure safety valves (PSV) are used for process safety to relieve excess pressure and function of both PSV and PRV is that they relieve excess pressure from system by opening automatically and they get closed automatically when system pressure normalizes.

Pressure Safety Valves (PSV) are also commonly referred to as simply Safety Valves, are used to relieve pressure from equipment operating Gases. Generally valve opens suddenly, at an instant. Pressure Relief Valves (PRV) are also commonly referred to as simply Relief Valves. They are a type of Safety Valve. They are used to relieve pressure from equipment operating Liquids. Generally the valve opens relatively gradually and proportionally.

Several factors e.g. backpressure, service, discharge capacity and inlet pressure losses are considered when selecting a relief devices.