Backflow prevention devices

Details Backflow prevention devices Backflow prevention devices

1977-09-12

1980-02-26

Weakley, Harold W.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

137469, 137494, 251282, 251357, F16K 3112

Patent

active

041900715

ABSTRACT:
A backflow prevention device is disclosed which includes a pressure differential relief valve. The relief valve includes a lift chamber functioning to accelerate opening of the valve to assure that the valve fully opens once it has partially opened. The relief valve also includes construction features which allow control of the opening timing of the valve and which cause added closing force to be applied on the valve member to provide more positive closure thereof. Furthermore, a member is provided which substantially eliminates transfer of torque from a spring in the relief valve to a diaphragm therein and substantially eliminates angular cocking of the moveable valve assembly also in the relief valve.

REFERENCES:
patent: 85963 (1869-01-01), Richardson
patent: 2586942 (1952-02-01), Grove
patent: 2869569 (1959-01-01), Kimmell
patent: 2880750 (1959-04-01), Amison
patent: 3021108 (1962-02-01), Noakes
patent: 3319649 (1967-05-01), Cummins
patent: 3330297 (1967-07-01), Mowbray
patent: 3448763 (1969-06-01), Curtiss
patent: 3905689 (1975-09-01), Mylander

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