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Difference between Pressure Safety Valve and Pressure Relief Valve: Although freely used interchangeably, these terms differ in the following aspect, ## Pressure Relief Valve - is the term used to describe relief device on a liquid-filled vessel. For such a valve the opening is proportional to the increase in the vessel pressure. Hence the opening of the valve is not sudden, but gradual if the pressure is increased gradually. ## Pressure Safety Valve - is the term used to describe the relief device on a compressible fluid or gas-filled vessel. For such a valve the opening is sudden. When the set pressure of the valve is reached, the valve opens almost fully. PLEASE READ MORE..... Industrial Catalyst And Classification. Electrical Hazards And Precautions. Renewable, Sustainable, Clean, or Green Energy. What Is Renewable Energy Or Renewable Resources, Or Clean Energy? Standard Operating Procedure (SOPs) Of The Steam Turbine. What Is Vacuum Hazard? Power Plant And...