Fluid handling – Line condition change responsive valves – Safety cut-off requiring reset
Patent
1992-08-24
1993-06-29
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Safety cut-off requiring reset
137495, 251 29, F16K 1722
Patent
active
052225186
ABSTRACT:
An air valve having a runaway control feature, including a movable piston which is insertable into air blocking position in a valve passage, a diaphragm separating two chambers, one chamber being coupled to the air passage upstream of the movable piston and the other chamber coupled to the air passage downstream of the movable piston, a rod movable by the diaphragm to activate a second air valve, the second air valve controlling the flow of air from the air passage upstream of the piston valve to the piston valve itself, thereby forcing the piston valve to move into air closure position in the passageway when the pressure drop upstream and downstream of the piston valve exceed predetermined limits. The invention includes a test feature which includes a third valve for manually unbalancing the air pressure across the diaphragm chambers to simulate the runaway air flow condition and thereby actuate the piston valve closure.
REFERENCES:
patent: 2497549 (1950-02-01), Heller
patent: 3400734 (1968-09-01), Rosenberg
patent: 3434493 (1969-03-01), Owens
patent: 3965927 (1976-06-01), Siczek
patent: 4188971 (1980-02-01), Otteson
patent: 4311296 (1982-01-01), Scheffel
patent: 4373548 (1983-02-01), Chou
patent: 4605039 (1986-08-01), Johnson et al.
patent: 4809740 (1989-03-01), Nevlud
patent: 4924905 (1990-05-01), Mastromatteo
Fisher Joel T.
Lewis Richard D.
Rescorla Charles
Graco Inc.
Nilson Robert G.
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