Expanding gate valve with fluid-powered actuator

Details Expanding gate valve with fluid-powered actuator Expanding gate valve with fluid-powered actuator

1984-01-05

1985-08-20

Jones, Larry

Valves and valve actuation

Fluid actuated or retarded

Dashpot or fluid controlled retarder or timer

251193, F16K 3112

Patent

active

045359679

ABSTRACT:
An expanding gate valve (10) provided with a piston type pneumatic powered actuator (40) for opening and closing the valve wherein the actuator piston (54) is adapted to be driven by fluid pressure in one direction to operate the valve but is returned by spring means (63, 64) when the pressure is removed. The actuator includes a hydraulic choke means (71) comprising a hydraulic piston (80) and cylinder (72) wherein the hydraulic piston is fixed to the actuator stem (23) and is provided with an orifice (89) which imposes a constant velocity control on the actuator stroke by producing a throttling effect on the hydraulic fluid moving from one side of the hydraulic piston to the other. The hydraulic cylinder (72) is filled with a fluid which maintains substantially uniform viscosity in the range of minus 40.degree. Centigrade to 204.degree. Centigrade whereby the valve is adapted for consistent operation during rapid cycling conditions. The actuator housing (41, 42) is a sealed unit with the exception of a single opening (69) which exposes one side of the actuator piston (54) to atmospheric pressure but which may serve as an inlet for pressurized fluid to convert the actuator to a double acting piston actuator when the spring force for returning the actuator piston is inadequate.

REFERENCES:
patent: 1850117 (1932-03-01), McMillan
patent: 2876789 (1959-03-01), Borden
patent: 3164359 (1965-01-01), Dyer et al.
patent: 3893652 (1975-07-01), Natho
patent: 4103863 (1978-08-01), Houlgrane et al.
patent: 4157169 (1979-06-01), Norman

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