In-line back flow preventer
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IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0128240
(1980-03-07)
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발명자
/ 주소 |
- Becker Bernard B. (Belmont MA) Bowman John K. (Brighton MA) Randall Cyril A. (Belmont MA)
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출원인 / 주소 |
- Amtrol Inc. (West Warwick RI 02)
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인용정보 |
피인용 횟수 :
6 인용 특허 :
4 |
초록
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A device for preventing the back flow of water from a point of use into a water supply line. The device includes a unitary casing having an inlet, a central chamber, an outlet, a removal port and a drain vent opening. The inlet, the central chamber and the outlet are coaxially aligned. A relief valv
A device for preventing the back flow of water from a point of use into a water supply line. The device includes a unitary casing having an inlet, a central chamber, an outlet, a removal port and a drain vent opening. The inlet, the central chamber and the outlet are coaxially aligned. A relief valve is located in the central chamber and offset from the coaxial alignment of the inlet, the central chamber and the outlet. There is a cover for the removal port. There is also a pair of check valves. One is mounted between the inlet and the central chamber and the other is mounted between the outlet and the central chamber. The device allows water to pass unobstructed in a straight-through flow path through the device. The back flow of water is prevented.
대표청구항
▼
Device for preventing the back flow of water from a point of use into a water supply line comprising a unitary casing having an inlet, a central chamber, an outlet, a removal port and a drain vent opening, said inlet, said central chamber and said outlet being coaxially aligned, a relief valve in fl
Device for preventing the back flow of water from a point of use into a water supply line comprising a unitary casing having an inlet, a central chamber, an outlet, a removal port and a drain vent opening, said inlet, said central chamber and said outlet being coaxially aligned, a relief valve in fluid communication with said central chamber and offset from said coaxial alignment of said inlet, said central chamber and said outlet, said removal port being located in the casing in direct communication with the central chamber, a cover for said removal port, a pair of check valves, one of said check valves being mounted between said inlet and said central chamber, the other of said check valves being mounted between said outlet and said central chamber, and said pair of check valves being coaxially aligned with said inlet, said central chamber and said outlet, whereby water passes essentially in a straight-through flow path through said device, and the back flow of water is prevented, means for removal of said pair of coaxially aligned check valves from said casing without removing said relief valve, and a flexible diaphragm formed integrally with a gasket located between said casing and said removable cover attached thereto, said gasket having an opening therethrough which allows removal of said check valves without disturbing said gasket or said flexible diaphragm, said relief valve being actuated by a pressure differential across said flexible diaphragm, one side of said diaphragm communicating with said central chamber and the drain vent opening and the other side of said diaphragm communicating with said inlet.
이 특허에 인용된 특허 (4)
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Sutherland ; Ray, Backflow preventer and relief valve assembly.
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Guyton Glen B. (3401 E. Newton Tulsa OK 74115), Check valve.
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Andersson ; Bo Allan ; Callahan ; Richard P., Stabilizing check valve.
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Gocke Eberhard (Mosbach DT) Vollmer Rudolf (Mosbach DT), Valve structure.
이 특허를 인용한 특허 (6)
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Noll, Brad L.; Orr, William M.; Hurt, Timothy W., Backflow prevention apparatus.
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Chen, De Fu, Non-refillable valve.
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Chen, De Fu, Non-refillable valve.
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Cong,Jing Jie, Non-refillable valve.
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Bielass, Ekkehard, Valve with lip seal.
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Daghe Joseph L. (Decatur IL) Sands Robert E. (Shelbyville IL), Water meter service installation.
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