Double check valve backflow preventer assembly

Details Double check valve backflow preventer assembly Double check valve backflow preventer assembly

1988-07-08

1990-01-16

Fox, John

Fluid handling

Systems

Flow path with serial valves and/or closures

137328, 1374546, 137512, F16K 1500

Patent

active

048936545

ABSTRACT:
A backflow preventer assembly for a liquid supply line includes a single unitary valve body including flanged inlet and outlet end openings and a single access opening generally normal to the flow path defined by the inlet and outlet openings. The body houses a pair of check valve seats on opposite sides of the access opening for seating a pair of check valves mounted in series to permit flow from the inlet opening to the outlet openings. Adjustable compression rods interconnecting the two check valves seat the valves against their oppositely facing valve seats. The check valves and compression rods are sized to enable installation and removal of the valves through the access opening. In one embodiment the valve body has a predetermined length for installation in the liquid supply line between a pair of gate valve assemblies, such length being the same as a standard body length for a single check valve assembly. In a second embodiment, the single unitary body incorporates, in addition to check valve assemblies, a pair of gate valve housings one on each of the opposite sides of the gate valve assemblies so that the single valve body can incorporate, as a unit, the complete backflow preventer assembly including gate valves and double check valves.

REFERENCES:
patent: 1573520 (1926-02-01), McNab
patent: 2102289 (1937-12-01), Smolensky
patent: 2197148 (1940-04-01), Hasbrouck
patent: 2602631 (1952-07-01), Eickmeyer
patent: 3063461 (1962-11-01), Rudolph
patent: 3088481 (1960-01-01), Brueckner et al.
patent: 3465778 (1969-09-01), Kast
patent: 3664371 (1972-05-01), Schneider
patent: 4100800 (1978-07-01), Pelt
patent: 4172465 (1979-10-01), Dashner
patent: 4232704 (1980-11-01), Becher et al.
patent: 4281680 (1981-08-01), Ripert
patent: 4284097 (1981-08-01), Beeber et al.
patent: 4429571 (1984-02-01), Kullmann et al.
patent: 4487217 (1984-12-01), Schmidt
patent: 4532958 (1985-08-01), Napolitano
Kent Meters, Inc., of Ooala, Fla. advertisement entitled "State-of-the-Art", 1 page (undated).
Ames Company, Inc., of Woodland, Calif., advertisement entitled "Ames Co. Valves & Backflow Assemblies", 8 pp. (undated).
Ames Company, Inc., of Woodland, Calif., brochure entitled "Double Check Backflow Preventer", 2 pp. (undated).
CLA-VAL Co., Backflow Preventer Div. of Newport Beach, Calif., brochure entitled "Backflow Prevention"-CLA Valve Company), 6 pages (1978).
Febco Division of Johns-Manville Company, description of "Model 805", entitled FEBCO Double Check Valve Assembly, 1 page (undated).
Hersey Products, Inc., Water Meter & Controls Group of Dedham, Mass., brochure entitled "Double Check Valve Assembly Sizes 3", 4", 6", 8" and 10"", 2 pages (1980).
ITT Kennedy Valve of Elmiar, N.Y., brochure entitled "Resilient-Seated Gate Valve", 8 pages (1986).

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