25 July 2008
Pressure relief valves are used for preventing the pressures and vacuums that can be destructive or cause malfunctions in equipment containers, storage vessels and pressure sensitive instruments.Excessive pressures which are positive over pressures or negative vacuum can cause functional and structural failure in instruments and equipments.In the event of increasing pressure due to system malfunction or environmental heating (or cooling) the relief valve will open at the set level and relieve the flowrate of air or gas until a safe working limit is achieved. The relief valve automatically resets when the closing pressure is reached and continues to maintain a safe working pressure.The uses of pressure relief valves allow designers to construct enclosures and instruments in light weight materials using the relief valve to maintain a safe working pressure.Pressure relief valves are available in a range of materials including metals and plastics. Weather proof protection is also an available option to protect against driving rain and high pressure hosing. A visual indicator is also available to signal when the safe operating has been exceeded and the pressure relief valve has operated to maintain a safe working pressure.Pressure relief valves can be used on cargo containers being transported by aircraft with opening pressures set to prevent in flight hazard in the event of pressurisation failure or malfunction.Pressure relief valves can be factory or adjusted on installation if flowrate and back pressure data is not available.
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