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Model No: 140

Designed for installation on bulk storage tanks, Storagetech™’s Model 140 Pressure Relief Valve is designed to protect the tank from excessive internal pressure.

In the closed position the weighted-loaded pallet and diaphragm assembly is held tightly against a seal to prevent the loss of vapour to atmosphere. As the internal pressure in the tank increases, due to product filling and vapour development, the pressure in tank increases and in the event that the set pressure of the unit is reached, the diaphragm will open and discharge the gas to atmosphere. The opening set-point is selectable from a range between +2.0 mbar and +60 mbar. (+0.8 inch W.C and +24 inch W.C), and the valve will close when the tank returns to a safe pressure.

The outlet port is protected by a weather hood and mesh guard to prevent ingress of debris that might obstruct the opening.

Pressure Vacuum Valve production certificates

Setting Range

Pressure: Weight-loaded +2.0 mbar and +60 mbar. (+0.8 inch W.C and +24 inch W.C)
* Different settings can be done as per request.
Ambient temp: -20°C to +60°C


Standard sizes:  2” to 12” 50 to 300mm
Flanges: API Class 150 RF, DIN PN16
Body:  Carbon steel, stainless steel, or aluminium
Seals:  Nitrile, Teflon, and Klingrit
Pallet:  Stainless steel AISI 304
Weights: Carbon steel, stainless steel, or aluminium
Paint finish:  Powder Coating, Colour RAL 9006, Epoxy Paint, Colour RAL 9006, Customer Specification
ATEX cert: Ex II 1/2 G c IIB

Design & Manufacturing Specifications

The integrity of the seal is tested for leakage in accordance with API Standard 2521 – Use of Pressure-Vacuum Vent Valves for Atmospheric Loss.

The size of the vent should be calculated in accordance with API Standard 2000 (ISO 28300) – Venting Atmospheric and Low-Pressure Storage Tanks or other international standards.

Pressure Vacuum Valves Models