Pressure and Vacuum Relief Valve

Pressure and Vacuum Relief Valve

Weight or Spring-Loaded Pressure and Vacuum Relief Valve


Direct acting pressure and vacuum relief valve (also known as breather valves, conservation vents, or safety vents) are low pressure devices specifically designed to protect tanks, process systems and equipment from excessive pressure and vacuum.

As well as providing the primary layer of protection for tanks and process systems, pressure/vacuum valves also minimise emission losses of gases or vapours, thus protecting the environment and providing significant financial savings.

The range includes pressure only, vacuum only and combined pressure/vacuum valves, all available with flanged outlets or vented to atmosphere.

Pressure / 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/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.

Pressure and Vacuum Relief Valve

Features & Benefits

Pressure and vacuum relief valves provide high flow capacity from a compact valve size
Wide range of pressure and vacuum settings to provide maximum tank protection whilst ensuring minimum gas loss
Designed and manufactured to API Std 2000 / ISO28300
Superior sealing meets the stringent demands of emission control regulations
Exceeds seat leakage requirements of API Std 2000 or ISO28300
No measurable leakage below 90% of the set pressure, less than 1 SCFH at 90% of the set pressure
Low leakage minimises evaporation loss
Economic savings due to reduced product loss
Alternative connection types available on request
Stem/pallet proximity switches available
Valve sizing service assists optimum valve performance / cost specification
Elmac technical support

We distribute this pressure and vacuum relief valve in India, Singapore and Malaysia.

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