Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1977-09-06
1980-06-17
Cline, William R.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
137116, 1371163, 137218, 1374546, 137549, E03C 110
Patent
active
042079152
ABSTRACT:
A back flow preventer for preventing contamination of a water supply. The preventer includes check valves which are enclosed in a casing comprised of a body and a single removable cover. The check valves are vertically disposed and spaced laterally from each other. The valves may be removed for servicing when the cover is removed without disturbing other parts of the device. Between the check valves is a relief valve which opens to drain the passage between the check valves when there is a drop in the supply line pressure sufficient to cause actual or potential reverse flow back toward the supply line. The check valves open by movement in opposite directions. Each check valve unit includes a tubular strainer through which all water must pass. The check valve units, while identically dimensioned as to the valve structure, include other parts of unequal dimensions which preclude accidental reversal of the units when being initially assembled or replaced after servicing.
REFERENCES:
patent: 2310586 (1943-02-01), Lohman et al.
patent: 2389413 (1945-11-01), Carton
patent: 2503424 (1950-04-01), Snyder
patent: 2586942 (1952-02-01), Grove
patent: 2598131 (1952-05-01), O'Donnell
patent: 2706488 (1955-04-01), Harrington
patent: 3044484 (1962-07-01), Dunning
patent: 3448763 (1969-06-01), Curtiss
patent: 3636968 (1972-01-01), Tine
patent: 3724487 (1973-04-01), Hunter
patent: 3747621 (1973-07-01), Tine
patent: 4037617 (1977-07-01), Perales
Becker Bernard B.
Bowman John K.
Randall Cyril A.
Amtrol Inc.
Chittick C. Yardley
Cline William R.
Spiegel H. Jay
LandOfFree
Back flow preventer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Back flow preventer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Back flow preventer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-471031