Closed loop type proportional electromagnetic valve for...

Details Closed loop type proportional electromagnetic valve for... Closed loop type proportional electromagnetic valve for...

F - Mech Eng,Light,Heat,Weapons

16

K

138/79.14

F16K 31/06 (2006.01) F16H 61/02 (2006.01)

Patent

CA 1252689

Abstract: A hydraulic control solenoid valve has a plunger provided in a coil case and a shaft shiftable freely in a body. The shaft carries a first spool valve and a second spool valve. A feedback chamber is provided in the body adjacent the first spool valve. A thin circular plate is fixed to the end of the first spool valve and is positioned in the feedback chamber to form a constriction of a flow passage formed between an inside wall of the feedback chamber and a peripheral surface of the plate. The cross-sectional area of the constriction is not larger than 0.04 times the side surface area of the plate. The plate adds a damping coefficient and also functions for stabilization of the behavior of the spool valves. The plate thus facilitates prevention of the resonance phenomenon in the spool valves.

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