Fluid handling – Larner-johnson type valves; i.e. – telescoping internal valve...
Patent
1989-12-27
1991-06-18
Rivell, John
Fluid handling
Larner-johnson type valves; i.e., telescoping internal valve...
137550, 251 44, F16K 3138
Patent
active
050242547
ABSTRACT:
A liquid shut-off valve has a hollow cylindrical casing connected in a liquid pipe such as a water supply pipe, a hollow cylindrical valve seat member disposed in a downstream portion of the casing and having a valve seat opening, a guide member disposed in an upstream portion of the casing and having large openings for allowing main flow of the liquid to pass therethrough and a small opening for shunting a small-rate flow of the liquid serving as a signal liquid, and a hollow valve seat member slidable in the casing between an open position where it opens the valve seat opening and a close position where it closes the valve seat opening. The hollow valve member having pressure-receiving ends of different pressure receiving areas so that it is moved to the close position when a liquid pressure is established in a pressure chamber defined by the hollow valve member and the guide member. The liquid shut-off valve further has a second shut-off valve unit provided in a line which connects the pressure chamber to a downstream portion of the liquid pipe and is capable of selectively opening and closing the flow of the signal liquid flowing from the pressure chamber. When the second shut-off valve closes the flow of the signal liquid, a pressure is built-up in the pressure chamber so as to drive the hollow valve member to the close position thereby shutting off the main flow of the liquid.
REFERENCES:
patent: 1046548 (1912-12-01), Bloom
patent: 1281566 (1918-10-01), Hedges
patent: 3113583 (1963-12-01), Fox
patent: 3198204 (1965-08-01), Parks
patent: 3415269 (1968-12-01), Salerno
patent: 3792716 (1974-02-01), Sime et al.
patent: 4444222 (1984-04-01), Yamagiwa
patent: 4522226 (1985-06-01), Yamagiwa
Hi-Sonic Co., Ltd.
Rivell John
LandOfFree
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