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Our pressure/vacuum relief valves are weight or spring-loaded.

Pressure & Vacuum Relief Valves

Features & Benefits
  • Pressure/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 2000:2014/ EN ISO 28300:2016
  • Superior sealing meets the stringent demands of emission control regulations
  • Exceeds seat leakage requirements of API Std 2000:2014 or EN ISO 28300:2016
  • No measurable leakage below 90% of the set pressures, less than 1SCFH at 90% of the set pressure
  • Low leakage minimises evaporation loss
  • Economic savings due to reduced product loss
  • Alternative connection types available on request
  • Proximity switches available on request
  • Valve sizing service provides optimum valve performance and cost effective technical specification
  • Elmac technical support
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Principle of operation

Elmac Pressure/Vacuum Relief Valves have weight-loaded or spring-loaded pallets. Flow through the valve is controlled by the weight of the pallet or the spring force acting on the pallet to keep the device closed.

Once the pressure or vacuum in the tank reaches the pallet closing force, the pallet will start to lift off the seat and allow flow through the valve.

Due to their air-cushioned sealing technology, Elmac valves prevent emission losses until very close to the set pressure and prevents air intake until very close to the set vacuum.

The geometry of the valves has been developed in order to optimise overall performance in terms of high flow capacity, set pressure, sealing and re-sealing.

The modular nature of Elmac’s valves means they can be tailored to meet specific customers requirements: whether this is pressure or vacuum protection only; or vapours and gases either piped away or vented to atmosphere.

A weatherhood protects the pressure vent port and a mesh screen is fitted to prevent intrusion of foreign matter into the valve.

Standards Compliance

Elmac’s products comply with all relevant industry standards including ATEX & ISO 16852 (Flame Arresters); API2000/ISO28300 & NFPA30 (Venting & Storage of Combustible Vapours & Liquids) and possible BLEVE (fire engulfment) incidents. In addition, Elmac is accredited to the following international standards: ISO 9001 (Total Quality Management), ISO 14001 (Environmental Management) and OHSAS 18001 (Occupational Health & Safety).

Enviromental Management
Quality Management
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PRV - Setting Pressures

Set Pressurembar(g)2~692~6969~103469~1034
Set Vacuummbar(g)-2~-43-43~-480-43~-480-2~-43
psi (g)-0.03 ~ -0.62-0.62 ~ -6.96-0.62 ~ -6.96-0.03 ~ -0.62

PRV - Dimensions

Nominal BoreLW*HRV1, RV10SHRV1SS, RV1S0M
W* indicates width, which is not marked in figures.
M: Weight is approximate for Series RV1 Valves. Does not include pallet weights.
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