Pressure Vacuum Vent (PV) valves are often referred to as breather valves or conservation valves. The latter term came into use when it was realised that evaporation losses were substantially reduced by using PV valves in lieu of open vents.

PV valves have a number of very useful characteristics that have made them standard apparatus on storage tanks:-

• They protect tanks against over and under pressure.
• They reduce evaporation losses compared to open vents.

The P. V. Valve is installed on the top of the vent pipes of underground or aboveground fuel storage tanks.

Normally closed ports in valve are operated at a predetermined pressure or vacuum setting to allow the tank to ventilate to avoid explosion.

FEATURES/SPECIFICATIONS:

• The main parts of the valve are made of Aluminium with SS/Brass wire mesh to protect from entering of any foreign particles.

• The Pressure/Vacuum settings:

For safe working the Pressure / Vacuum setting at 3 inch(+/- 0.5 inch) water column pressure setting and 8 inch(+/- 2 inch) water column vacuum settings are factory preset and tested by the use of water manometer.

No special tools are required to carry out periodic maintenance. Periodically i.e. at least once in six months SS/Brass wire mesh should be cleaned for smooth functioning of the valve.