Liquid purification or separation – Flow – fluid pressure or material level – responsive – Vent control
Patent
1988-05-18
1990-04-17
Jones, W. Gary
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Vent control
210123, 210169, 1376142, 13761421, 137202, B01D 2320
Patent
active
049177958
ABSTRACT:
An improved automatic air pressure relief and check valve assembly which may be used in combination with a swimming pool filter tank or a swimming pool separation tank. The valve assembly includes a normally open lower valve which communicates with the inside of the tank and is responsive to the tank's being full of pressurized water for closing the lower valve. The valve assembly further includes a normally closed upper valve communicating with the lower valve and the outside of the tank, the upper valve being responsive to air being expelled from the tank through the open lower valve, when water is filling the tank, for opening the upper valve to permit the air being expelled to exit through the upper valve. Cooperating with the upper and lower valve of the improved valve assembly is means for precluding both the upper and the lower valves from being simultaneously maintained in their closed conditions. Associated with the normally closed upper valve is selectively actuable means responsive to an externally applied force for opening and maintaining open the upper valve while the force is applied during selected times when water is not entering the tank, for permitting air to enter the tank so that water may be drained from the tank when desired.
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The Johnson Corporation, Bulletin VB-1001, "Vacuum Breakers", 6/12/84.
The Johnson Corporation, private communication including letter dated 1/3/85 and drawing dated 6/23/82.
pp. 6-25 and 6-26 of Parker Handbook.
Church Henry
Maldarelli Lawrence V.
Sable Chester A.
Anthony Industries, Inc.
Jones W. Gary
Lee Coreen Y.
Weiss David
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