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Difference between revisions of "Vacuum Relief Valves"
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[[File:Vacuum relief valve.jpg|thumb|right|Vacuum Relief Valves]] | |||
[[File:Vacuum relief valve1.jpg|thumb|right|Vacuum Relief Valves]] | |||
'''Vacuum Relief Valves''' also known as breather valves, conservation vents, or safety vents are special types of [[Relief Valves]] which are specifically designed for tank protection. The range includes pressure only, vacuum only and combined pressure or vacuum valves, all available with flanged outlets or vented to atmosphere. | |||
Vacuum relief valves are used extensively on bulk storage tanks, including fixed roof tanks with floating covers, to minimise evaporation loss. The [[Valves]] prevent the build up of excessive pressure or vacuum which can unbalance the system or damage the storage vessel. | |||
Pressure and vacuum protection levels are controlled with weighted [[Pallets]] or springs and can be combined to provide the required pressure or vacuum settings. It is common to combine pallet and spring systems in one unit i.e. pressure settings require a spring section, whilst the vacuum settings use the pallet method. | |||