Elmac Technologies - Weight or Spring-Loaded Pressure Relief Valves
Direct acting pressure 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. This pressure-only unit allows pressure relief to atmosphere. Pressure relief valves are used extensively on bulk storage tanks, including fixed roof tanks with floating covers, to minimise evaporation loss. The valve prevents the build up of excessive pressure which can unbalance the system or damage the storage vessel.
The valve has a cast body which is flanged for connection to the storage tank and a weather hood protects the pressure exhaust port. Piped-away versions and spring-loaded valves are also available throughout the range.
The valve incorporates a pallet and diaphragm assembly which rests on an `O` ring seal to prevent leakage. This `O` ring can be removed and the seat machined optically flat, producing a metal to metal seating arrangement if required. The weight of the pallet pushes the diaphragm against the seat to keep it closed. When the pressure increases, the pallet and diaphragm lifts and air/gas is allowed to flow.
- Pressure relief valves provide high gas flow from a compact valve size
- Range of sizes and materials to suit a wide range of applications
- Wide range of pressure settings to provide maximum tank protection whilst ensuring minimum gas loss
- Valve sizing service assists optimum valve performance/cost specification
- Multiple configuration options for venting to pipes or atmosphere
- The Elmac technical team can advise on specific location queries