9 ea. - 4 inch Air Release-Vacuum Valves
and 5 ea. - 6 inch Air Release - Vacuum Valves
Spec: Combination air release vacuum valves operating at 150 psi shall be on a single body, double orifice type allowing large volumes of air to escape out of the large air vacuum orifice when filling the pipeline and to close water tight when the liquid enters the valve. During closure of the large orifice, the small air release orifice shall open to allow small pockets of air to escape automatically and independently of the large orifice. The large air vacuum orifice shall also allow large volumes of air to enter through the orifice during pipeline drainage to break the vacuum. Valves shall be manufactured in accordance with AWWA C512.
The valve body and cover shall be high strength plastic or cast iron conforming to ASTM A-126, Class B. The body inlet must be baffled to protect the lower and upper floats from direct contact of the rushing air and water to prevent premature valve shut off. All floats shall be stainless steel conforming to ASTM A-240, be hermetically sealed and designed to withstand a minimum of 1000 psi. The upper float shall be center guided for position shut off.
The valve seat shall be Buna-N Rubber. The seat must be fastened to the valve cover, without distortion, for drip tight shut off.
The level frame shall be Delrin conforming to ASTM D-638 and the lug shall be bronze conforming to ASTM B-124-55.
ARI USA, Inc. Model D-40 or GA Industries, Inc. 945 Series are allowed.
