Motors: expansible chamber type – Working member position feedback to motive fluid control – Bias-type input and feedback signal means
Patent
1977-07-11
1980-05-06
Cohen, Irwin C.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Bias-type input and feedback signal means
91365, 13762564, 251 30, 335266, F15B 1316
Patent
active
042011167
ABSTRACT:
A conventional control valve hydraulically powered by a double acting cylinder and controlled electrically through a double acting solenoid supplied by a variable D.C. supply. The solenoid transmits varying forces to a four-way pilot valve which in turn controls the positioning of the double acting cylinder. The de-energized solenoid, control valve spool and pilot spool are neutrally balanced between two springs equally loaded with differing spring rates so that a small movement of the solenoid core will cause a proportionally larger movement of the main control valve spool proportioned to the different spring rates.
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patent: 3954045 (1976-05-01), Barlow
SLI Industries Catalog (1976), p. 3.
Cohen Irwin C.
The Cessna Aircraft Company
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