Features

●  Double orifice air valve that combines both large orifice & small orifice functions within one unit.
●  The large orifice allows air to be expelled from the system during filling of a pipeline and admit air back into the system whenever sub-atmospheric pressure occurs.
●  Air is vented from the system until water enters the valve and lifts the float against its seat, ensuring a tight seal.
●  In the event of sub-atmospheric pressure in the system, the water level drops causing the float to fall
from its seat and allow the admission of air.
●  During normal working， small orifice releases the air which accumulates under pressure in operation,
the float is normally against its seat.
●  As air enters the chamber body the water level is depressed until a level is reached when the float drops from its seat, which allows air to escape. The consequent rise in water level returns the float to its seat.

Handling and Storage

● Lifting the valve improperly may damage it. Do not fasten lifting devices to ports in valve. Lift the
valve with slings, chains or cables fastened around the valve body, or fastened to bolts or rods
through bolt holes in the flanges.

● If installation will be delayed, place valve indoors in secure, weather tight storage. If temporary
outside storage is unavoidable, make sure a vermin proof rain cover (water shedding tarp, etc.)
is secured around/over the valve to keep off rain and mud. Skid and set the assembly on a flat,
solid, and well drained surface for protection from ground moisture, runoff and pooled rain
water.

Temperature

Up to 120 °C for rubber Ball