Becker Bernard S. (Belmont MA) Bowman John K. (Brighton MA) Randall Cyril A. (Belmont MA)
출원인 / 주소
Amtrol Inc. (West Warwick RI 02)
인용정보
피인용 횟수 :
36인용 특허 :
3
초록▼
A back flow preventing device which prevents the reverse flow of water from a point of use into a water supply system. The device has a casting with coaxially aligned inlet and outlet openings, and containing coaxially aligned inlet and outlet check valves. The coaxial alignment of the inlet and out
A back flow preventing device which prevents the reverse flow of water from a point of use into a water supply system. The device has a casting with coaxially aligned inlet and outlet openings, and containing coaxially aligned inlet and outlet check valves. The coaxial alignment of the inlet and outlet openings, and of the inlet and outlet check valves serves to minimize the pressure drop through the device. Between the inlet and outlet check valves is a diaphragm actuated relief valve which opens to drain the passage between the check valves if they should malfunction or if there is a drop in the supply line pressure sufficient to cause actual or potential reverse flow back toward the supply line.
대표청구항▼
A device for preventing the back flow of water from a point of use into a water supply line comprising: (a) a unitary casing having a water inlet opening, a water outlet opening, a drain vent inlet opening, and a removal opening, said water inlet and water outlet openings being coaxially aligned, th
A device for preventing the back flow of water from a point of use into a water supply line comprising: (a) a unitary casing having a water inlet opening, a water outlet opening, a drain vent inlet opening, and a removal opening, said water inlet and water outlet openings being coaxially aligned, the interior of said casing defining an inlet chamber, a central chamber, an outlet chamber, a first communicating passage between the inlet chamber and the central chamber and a second communicating passage between the central chamber and the outlet chamber, said chambers being coaxially aligned with each other and with said water inlet and water outlet openings to form a straight through flow path for the water, said interior of said casing also defining a drain vent chamber communicating with said drain vent opening and said central chamber, said drain vent chamber being offset from said coaxially aligned inlet, central and outlet chambers, said removal opening directly communicating with said central chamber; (b) a first check valve assembly detachably mounted in said first communicating passage at the central chamber end thereof, in a manner which, after detachment of said first check valve assembly, allows removal of said first check valve assembly from said casing only via said central chamber, said first check valve being biased in a closed position to prevent the flow of water therethrough and opening to permit the flow of water therethrough when the water pressure in the water inlet chamber exceeds a predetermined level, said first check valve being coaxially aligned with said water inlet and outlet openings and said inlet, central and outlet chambers; (c) a second check valve assembly detachably mounted in said second communicating passage at the central chamber end thereof, in a manner which, after detachment of said second check valve assembly, allows removal of said second check valve assembly from said casing only via said central chamber, said second check valve being biased in a closed position to prevent flow of water therethrough when the water pressure in said central chamber exceeds a predetermined level, said second check valve being coaxially aligned with said water inlet and outlet openings and said inlet, central and outlet chambers; (d) a relief valve located within said casing interposed between said central chamber and said drain vent chamber, said relief valve being biased in an open position, said relief valve being offset from said coaxially aligned inlet, central and outlet chambers; (e) a flexible diaphragm attached to said casing and to said relief valve, one side of said diaphragm communicating with said central chamber and with said drain vent opening, said central chamber communicating with said drain vent opening by a communicating route, including a valve seat passage, through said relief valve, the other side of said diaphragm communicating with said inlet chamber, said relief valve having an element which closes said valve seat passage when there is a pressure differential between said inlet and central chambers caused by flow of water from said inlet chamber into said central chamber through said first communicating passage, thereby preventing water flow from said central chamber to said drain vent chamber, said valve seat passage being open when said pressure differential is not present; and (f) a cover removably attached to said casing over said removal opening therein, said first and second check valve assemblies being removable from said central chamber without removal of said flexible diaphragm when said cover is detached.
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이 특허에 인용된 특허 (3)
Sutherland ; Ray, Backflow preventer and relief valve assembly.
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