Electro-hydraulic proportional control servo valve

Details Electro-hydraulic proportional control servo valve Electro-hydraulic proportional control servo valve

F - Mech Eng,Light,Heat,Weapons

15

B

137/99

F15B 9/00 (2006.01) F15B 13/00 (2006.01) F15B 13/043 (2006.01)

Patent

CA 1074663

ABSTRACT OF THE DISCLOSURE 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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