초록 ▼

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 tan

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.

대표청구항 ▼

A valve assembly connected to the upper portion of a tank for being filled with and drained of liquid, the valve assembly comprising: first valve means communicating with the inside of the tank, said first valve means responsive for being closed by the tank\s being full of pressurized liquid; second

A valve assembly connected to the upper portion of a tank for being filled with and drained of liquid, the valve assembly comprising: first valve means communicating with the inside of the tank, said first valve means responsive for being closed by the tank\s being full of pressurized liquid; second valve means communicating with said first valve means and the outside of the tank, said second valve means responsive for being opened by gas being expelled from the tank through said first valve means when liquid is filling the tank for permitting the gas being expelled to exit through said second valve means; means cooperating with said first valve means and said second valve means for preventing both of said first and second valve means from being simultaneously maintained in their closed conditions; and selectively actuable means associated with said second valve means for permitting an external force to be applied to said second valve means, for opening and maintaining open said second valve means while said force is applied during selected times when liquid in the tank is not pressurized for permitting gas outside the tank to enter the tank and liquid to drain from the tank.