Valves and valve actuation – Fluid actuated or retarded – With mechanical movement between actuator and valve
Patent
1978-08-22
1979-12-25
Rosenthal, Arnold
Valves and valve actuation
Fluid actuated or retarded
With mechanical movement between actuator and valve
251230, 74128, 74578, F16K 3152, F16K 3116
Patent
active
041802381
ABSTRACT:
The present invention is a bi-directional valve actuator with a ratchet mechanism for use in combination with a control valve which includes a stem which, when turned, adjusts the flow through the control valve. The bi-directional valve actuator includes a frame which is mechanically coupled to the control valve adjacent to the other end of the stem of the control valve. The valve actuator also includes a shaft which is disposed within the frame and which is rotatably coupled thereto with the shaft being mechanically coupled to the stem of the control valve so it can turn the stem thereof, a first ratchet wheel and a second ratchet wheel. Each ratchet wheel is coaxially aligned with the shaft and is fixedly coupled thereto. The valve actuator further includes a pair of pawls, each of which is coupled to one of the ratchet wheels so that when the pawl is driven forward it becomes coupled to the teeth of one of the ratchet wheels and when the pawl is pulled backward it becomes uncoupled from the teeth of one of the ratchet wheels. Each pawl is mechanically coupled to and driven forward by a hydraulic cylinder with a piston, which is fixedly coupled to the pawl and it is also mechanically coupled to and driven backward by a pair of springs mechanically coupled to the frame. The pawl is coupled to the wheel of the ratchet wheel by a collar which is disposed about the peripheral edge of the ratchet wheel and which has a slot and a radially disposed hole with a pin and spring assembly therein. The pin and spring assembly is mechanically coupled to the pawl by a pin.
REFERENCES:
patent: 2641280 (1953-06-01), Fleischhauer
patent: 2736204 (1956-02-01), Hill
patent: 2880757 (1959-04-01), Campbell
patent: 3332438 (1967-07-01), Abdullaev et al.
Johansen W. Edward
Rosenthal Arnold
Valve Concepts International, Inc.
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