Control valve unit for a hydraulic servo motor for a control val

Details Control valve unit for a hydraulic servo motor for a control val Control valve unit for a hydraulic servo motor for a control val

1975-11-10

1977-05-24

Croyle, Carlton R.

Rotary kinetic fluid motors or pumps

With control means responsive to non-cyclic condition...

By shaft speed or torque responsive means

F01D 1704

Patent

active

040252221

ABSTRACT:
A valve system for controlling the flow of hydraulic fluid for opening and closing the main control valve for a turbine system. The valve system comprises: first valve means for passing hydraulic fluid to the servo motor to maintain the control valve open during normal operating conditions of the turbine and to interrupt the supply of hydraulic fluid in response to a predetermined normal pressure drop; second valve means for draining hydraulic fluid from the servo motor to close the control valve in response to a predetermined normal pressure drop in the turbine system; and third valve means for separately draining hydraulic fluid from the servo motor to relieve the latter of pressure rapidly in response to an abnormal pressure drop in the turbine system with consequent rapid closing of the control valve.

REFERENCES:
patent: 863197 (1907-08-01), Mattico
patent: 3027137 (1962-03-01), Eggenberger

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