Hose-type faucet with backflow preventer

Details Hose-type faucet with backflow preventer Hose-type faucet with backflow preventer

1992-01-31

1993-08-31

Fox, John C.

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

137218, 4675, E03C 110

Patent

active

052400298

ABSTRACT:
A backflow preventer used in combination with a valve that normally supplies water under pressure to a feed conduit and with an outlet device having a supply hose to which water is normally supplied under pressure has a housing forming a generally closed chamber and formed with an inlet port connected with the feed conduit and opening into the chamber, an outlet port connected to the hose and opening into the chamber directly underneath the inlet port, and a vent port having an outside exposed to ambient air and forming substantially the only direct passage between the chamber and an ambient atmosphere around the housing. A check valve in the vent port only permits flow through the port into the chamber so that air can be drawn into the chamber through the vent port when pressure in the chamber is below ambient pressure. A nozzle fitted to the inlet port directed downward along a vertical axis into the outlet port forms therewith a jet pump for transferring water from the inlet port to the outlet port.

REFERENCES:
patent: 1954105 (1934-04-01), Stoddard
patent: 2250291 (1941-07-01), Boosey
patent: 3730209 (1973-05-01), Binard et al.
patent: 5079781 (1992-01-01), Gnauert et al.

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