Hydraulic servo-motor for a regulating valve having a hydraulic

Details Hydraulic servo-motor for a regulating valve having a hydraulic Hydraulic servo-motor for a regulating valve having a hydraulic

1978-09-29

1980-10-14

Maslousky, Paul E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91382, 91388, 91461, F15B 910, F15B 1316

Patent

active

042274419

ABSTRACT:
A valve actuator is disclosed having a servo-motor which regulates the position of a main valve that controls steam supply to a turbine. A hydraulic input signal acts on a pilot valve within the valve actuator body to move a valve spool in response to the input signal. Movement of the valve spool permits oil to flow into a cylinder in which the servo-motor is located. The flow of oil into the cylinder causes a piston which is a part of the servo-motor to move upwardly. Movement of the servo-motor is regulated by a cam and follower arrangement which transfers the motion of the servo-motor to a valve sleeve. The valve sleeve, which has a differential piston area, shuts-off the supply of oil to the servo-motor. The cam and follower arrangement provides for a linear correlation between the hydraulic input signal and the operation of the servo-motor. Increased closing forces provided by the differential piston reduce vibration of the valve sleeve and the servo-motor.

REFERENCES:
patent: 2141260 (1938-12-01), Caughey
patent: 2974639 (1961-03-01), O'Connor et al.
patent: 3222996 (1965-12-01), Thieme et al.
patent: 3386343 (1968-06-01), Gray

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