Fluid handling – Line condition change responsive valves – Bi-directional flow valves
Patent
1981-05-01
1983-09-06
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Bi-directional flow valves
137322, 13751629, 141 21, 222 3, 2511498, 251210, 251272, 251335A, F16K 1518
Patent
active
044023405
ABSTRACT:
A combined manual and pressure-responsive shut-off valve, intended particularly for use with high pressure gas cylinders, is disclosed. The valve includes a single seat and a single plug, the plug having a first sealing surface for closing against a low residual pressure in the cylinder and a second sealing surface for closing against a relatively high cylinder pressure. A pressure-responsive actuator engages the first sealing surface against the seat whenever pressure in the cylinder falls below a predetermined minimum. A manual actuator engages the second sealing surface against the valve seat to close against a wide range of pressures. The seat is specifically configured to conform to the plug. Means are provided for refilling the cylinder without removing the combined valve. In one embodiment, a special tool is provided for opening the pressure-responsive actuator. In a second embodiment, a bypass check valve is provided to allow gas to flow into the cylinder.
REFERENCES:
patent: 1595786 (1926-08-01), Johnson
patent: 2527359 (1950-10-01), Guth
patent: 2645241 (1953-07-01), Riede
patent: 2661925 (1953-12-01), Barkelew
patent: 2861569 (1958-11-01), Emerson
patent: 2927767 (1960-03-01), Ray
patent: 2931385 (1960-04-01), Carlisle
patent: 3292895 (1966-12-01), Leger
patent: 3307597 (1967-03-01), Shugarman
patent: 3645286 (1972-02-01), Follett
patent: 3930517 (1976-01-01), Gagala
patent: 4210168 (1980-07-01), Yonezawa
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