Pressure relief valve -
A spring-loaded pressure relief valve which is
designed to open to relieve excess pressure and to reclose and prevent
the further flow of fluid after normal conditions have been restored. It
is characterised by a rapid-opening 'pop' action or by opening in a
manner generally proportional to the increase in pressure over the
opening pressure. It may be use
d for either compressible or incompressible fluids, depending on design, adjustment, or application.
This is a general term, which includes safety valves, relief valves and safety relief valves.
Safety valve - A pressure relief valve actuated by inlet static pressure and characterized by rapid opening or pop action.
Safety valves are primarily used with compressible gases and in particular for steam and air services. However, they can also be used for process type applications where they may be needed to protect the plant or to prevent spoilage of the product being processed.
* Relief valve - A pressure relief device actuated by inlet static pressure having a gradual lift generally proportional to the increase in pressure over opening pressure.
* Relief valves are commonly used in liquid systems, especially for lower capacities and thermal expansion duty. They can also be used on pumped systems as pressure overspill devices.
* Safety relief valve - A pressure relief valve characterised by rapid opening or pop action, or by opening in proportion to the increase in pressure over the opening pressure, depending on the application, and which may be used either for liquid or compressible fluid.
In general, the safety relief valve will perform as a safety valve when used in a compressible gas system, but it will open in proportion to the overpressure when used in liquid systems, as would a relief valve.
This is a general term, which includes safety valves, relief valves and safety relief valves.
Safety valve - A pressure relief valve actuated by inlet static pressure and characterized by rapid opening or pop action.
Safety valves are primarily used with compressible gases and in particular for steam and air services. However, they can also be used for process type applications where they may be needed to protect the plant or to prevent spoilage of the product being processed.
* Relief valve - A pressure relief device actuated by inlet static pressure having a gradual lift generally proportional to the increase in pressure over opening pressure.
* Relief valves are commonly used in liquid systems, especially for lower capacities and thermal expansion duty. They can also be used on pumped systems as pressure overspill devices.
* Safety relief valve - A pressure relief valve characterised by rapid opening or pop action, or by opening in proportion to the increase in pressure over the opening pressure, depending on the application, and which may be used either for liquid or compressible fluid.
In general, the safety relief valve will perform as a safety valve when used in a compressible gas system, but it will open in proportion to the overpressure when used in liquid systems, as would a relief valve.
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