Air Valve, Size 12 inch, Working Pressure 175PSI

Single / double / kinetic cast irondiameter options from 20From millimeters to 250mm air valves are regularly used to provide the following requirements on water mains to release air when the main is being filled, And for sealing and remain closed when the pipe is full to safeguard against loss of for accessing, Water. Also and admit air when the main is being emptied. To release air accumulating under pressure during standard operational environment in again without, The pipe loss of water. Should the situation arise of a relatively large orifice is employed giving a high rate of discharge. The valve, A buoyant ball seals the, In water orifice when main filling is complete and is held there by the line pressure until such times as the main is shut for emptying. Forthe ball leaves its seating under pressure when liquid within the chamber is displaced by a accumulated air. A comparatively small, Sized orifice of a, Is used diameter sufficient to ensure reliable working, While allowing of convenient ball and casting dimensions for an ample range of regular working pressures