Self draining hose connection dual check valve back flow prevent

Details Self draining hose connection dual check valve back flow prevent Self draining hose connection dual check valve back flow prevent

1992-01-22

1993-07-20

Fox, John C.

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

137798, F16K 2400

Patent

active

052284700

ABSTRACT:
In order to prevent contamination of a fluid source and to ensure drainage of a sill cock or the like, a detachable check valve back flow preventer for installation between a fluid inlet line and a fluid outlet line is provided. A housing with means for fastening the device to a fluid inlet line at one end of the housing and for connecting a fluid outlet line at the other end of the housing is provided. The housing has a central cavity within the housing. An inlet line drain valve is located within the housing between the central cavity and the fluid inlet line to provide for the drainage of fluid from the fluid inlet line to the fluid outlet line end of the housing when the fluid outlet line is not connected to the back flow preventer. A second valve is located within the housing between the central cavity and the fluid inlet line to control flow of fluids between the fluid inlet line and the central cavity. A third valve is located within the housing between the central cavity and the fluid outlet line to control flow between the central cavity and the fluid outlet line. In a second aspect of this invention a fourth valve is located within the housing between the central cavity and the drainage flow path to control flow between the central cavity and the venting means. This second aspect can be utilized in conjunction with the above three valves or in combination with only the second and the third valve.

REFERENCES:
patent: 3155107 (1964-11-01), Woodford
patent: 3905382 (1975-09-01), Waterston
patent: 4080981 (1978-03-01), Stewart
patent: 4646775 (1987-03-01), Traylor
patent: 4658852 (1987-04-01), Weingarten
patent: 4726390 (1988-02-01), Franklin
patent: 4821763 (1989-04-01), Ackroyd et al.
patent: 4893644 (1990-06-01), Giacomini
patent: 4909270 (1990-03-01), Enterante, Sr. et al.
patent: 4953584 (1990-09-01), Vegso
patent: 4976279 (1990-12-01), King, Sr. et al.
patent: 4984306 (1991-01-01), Sumerix

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