Valves and valve actuation – Fluid actuated or retarded – With mechanical movement between actuator and valve
Patent
1989-08-18
1990-05-15
Walton, George L.
Valves and valve actuation
Fluid actuated or retarded
With mechanical movement between actuator and valve
74 54, 74 56, 74110, 92 14, 92 65, 92130B, 251 636, 251243, 251244, 251246, F16K 31122, F16K 3152
Patent
active
049251546
ABSTRACT:
An improved gate valve having a body with a chamber and an inlet and an outlet extending therethrough into said chamber, a gate mounted for reciprocation in said chamber between open and closed positions, a pressure responsive actuator having a housing, a piston, a connection to the gate and an actuating stem extending from the housing, a supplemental actuator having a connection to the actuator housing, an operating stem connected to the actuating stem, the operating stem having a shoulder facing in the direction opposite to the direction of closing movement of the gate, roller levers pivotally mounted to be in engagement with the exterior of the operating stem and a spring urging the roller levers into tight engagement with the operating stem, the roller levers pivoting on engagement with the stem shoulder to exert a closing force on the stem. In a modified form of the invention, lever-roller assemblies are provided within the actuator to increase the closing force of the piston during the last portion of its stroke by changing the spring force provided by the actuator spring.
REFERENCES:
patent: 3812766 (1974-05-01), Weiss
patent: 4070002 (1978-01-01), Bonafous
patent: 4445424 (1984-05-01), Foster
patent: 4519575 (1985-05-01), Akkerman et al.
patent: 4523516 (1985-06-01), Foster et al.
patent: 4549719 (1985-10-01), Baumann
patent: 4651970 (1987-03-01), Sadler
patent: 4684103 (1987-08-01), Baumann
patent: 4729544 (1988-03-01), Baumann
patent: 4791856 (1988-12-01), Heim et al.
Cameron Iron Works USA Inc.
Walton George L.
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