Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1976-06-11
1978-03-28
Cohen, Irwin C.
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
137529, 251 77, F16K 2400
Patent
active
040809803
ABSTRACT:
An improved backflow preventing valve having an inlet passage opening to an intermediate chamber via an improved inlet check valve with the intermediate chamber opening to an outlet passage via an improved outlet check valve. A diaphragm chamber communicates with the intermediate chamber having a diaphragm therein dividing the diaphragm chamber into an inlet pressure portion opening into the inlet passage and an intermediate pressure portion opening to the intermediate chamber. An exhaust passage opening to atmosphere communicates with the intermediate pressure portion whereby fluid normally flows from the inlet passage through the intermediate chamber to the outlet passage but upon attempted backflow of the fluid, the improved check valves close with a positive closing action to prevent such backflow and, upon failure of the outlet check valve, the diaphragm flexes to open to vent such backflowing fluid out the exhaust passage. Before failure of the outlet check valve, an improved relief valve associated with the diaphragm compensates for slight flexing of the diaphragm to prevent fluid spitting due to slight changes in the pressure of the incoming fluid while permitting fluid to be subsequently exhausted out of the exhaust passage.
REFERENCES:
patent: 2518387 (1950-08-01), Shaw
patent: 2644480 (1953-07-01), Earle et al.
patent: 2659382 (1953-11-01), Ifield
patent: 2859762 (1958-11-01), Banker
patent: 3113172 (1963-12-01), Barr
patent: 3197960 (1965-08-01), Forster
patent: 3724487 (1973-04-01), Hunter
patent: 3799498 (1974-03-01), Wickham et al.
Cohen Irwin C.
The Toro Company
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