US PATENT SUBCLASS 91 / 365
.~ With main valve position feedback to pilot valve

Current as of: June, 1999
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91 /   HD   MOTORS: EXPANSIBLE CHAMBER TYPE

358 R  DF  WORKING MEMBER POSITION FEEDBACK TO MOTIVE FLUID CONTROL {12}
365.~ With main valve position feedback to pilot valve

DEFINITION

Classification: 91/365

(under subclass 358) Apparatus in which the valve means is actuated by a fluid pressure operated motor and a secondary or pilot valve is operable to control the flow of pressure fluid to the valve actuating motor, the input signal being applied to the secondary or pilot valve and additional position feedback means being provided from the valve actuating motor to the pilot valve.