Shear Relief Valve

Definition - What does Shear Relief Valve mean?

A Shear Relief Valve is a type of valve consisting of one or two shear pins used to set the relief pressure. The shear pins are chosen from several standard-sized pins installed on the shear relief valve. A relief valve is a valve that controls the pressure in a system so as to avoid certain accidents like equipment failure. It is designed in such a way that it allows the pressurized fluids to pass through the auxiliary passage of the system. The main principle when designing this valve is to protect the vessels and other tools subjected to pressures exceeding their pressure limits.

Petropedia explains Shear Relief Valve

Shear pins contained in a shear relief valve can be taken out in order to set the relief pressure if necessary. These valves are usually available in the sizes of 2 to 3 inches and can withstand pressure ranging from 125 to 5,000 lbs. A relief valve is used in petroleum refining, chemical manufacturing, and power generation industries. It mainly works during an over-pressure event for the protection of life and property in the over pressurized vessel. When the pressure in a vessel exceeds the limit, the relief valves divert fluids in the vessel and the pressure inside the vessel stops rising. There are various types of Relief Valves such as spring-loaded relief valve, balanced piston valves, and balanced bellow valves. The design of the pressure relief valve is simple thus it offers utmost reliability.

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