Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1998-09-23
1999-11-16
Ferensic, Denise L.
Fluid handling
Line condition change responsive valves
Direct response valves
137519, 137460, F16K 1500, F16K 1700
Patent
active
059839287
ABSTRACT:
A gas safety valve includes a main body having a longitudinal through hole that defines a gas passage. The longitudinal hole has an inlet end communicated with a gas source, an outlet end through which gas from the gas source exits, a first mediate section adjacent to the outlet end, and a second mediate section between the first mediate section and the inlet end. A spring is mounted in the first mediate section, and a ball is movably mounted in the second mediate section. The first mediate section has a diameter greater than that of the outlet end, while the second mediate section has a diameter greater than that of the first mediate section such that the ball is capable of partially protruded into the first mediate section to block the gas passage defined by the longitudinal through hole. When no gas leakage occurs, a pressure difference between two ends of the ball is relatively small and thus forces the ball to a position not blocking the gas passage. To the contrary, when gas leakage occurs, the pressure difference between the two ends of the ball is relatively high and thus forces the ball to move toward the outlet end of the main body and thus blocks the gas passage by partially protruding into the first mediate section.
REFERENCES:
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patent: 3683957 (1972-08-01), Sands
patent: 3766940 (1973-10-01), Mason
patent: 4010770 (1977-03-01), Peters
patent: 4269223 (1981-05-01), Carter et al.
patent: 4349042 (1982-09-01), Shimizu
patent: 4830046 (1989-05-01), Holt
patent: 5215113 (1993-06-01), Terry
Ferensic Denise L.
Kim Joanne Y.
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