Answer / sbaskar

psv is pressure safety valve it pops up at the set pressure and resets at the set pressure.the operation is sudden
prv is pressure relief valve it opens when the pressure gets increased.the operation is gradual.

Answer / sundar

PSV is the pressure relief device for high pressure system,

PRV is also pressure relief device for low pressure system
PRV Pressure regulating valve is depends on what people are using the term

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