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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...

What is a Check Valve? The valve that used to prevent back flow  in a piping system is known as a check valve. It is also known as a non-return valve or NRV. The pressure of the fluid passing through a pipeline opens the valve, while any reversal of flow will close the valve. It allows full unobstructed flow and automatically shuts as pressure decreases. The exact operation will vary depending on the mechanism of the valve. Parts of Non-Return Valve: It is consists of body, cover, disk, hinge pin, and seat ring. In the image below you can see the parts of the valve. Types of Valves:- The type of disk will decide the type of valve. Most common types of Check valves are #    Swing Type. +    Top Hinged +    Tilting disk #    Lift Type +    Piston Type +    Ball type #    Dual Plate Type #    Stop Check Valve Application of Check Valve (NRV): Check valves (Non...