Displacement controlled hydraulic proportional valve

Details Displacement controlled hydraulic proportional valve Displacement controlled hydraulic proportional valve

1993-12-27

1994-09-27

Michalsky, Gerald A.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

91387, 13762564, 251 47, F16K 3142

Patent

active

053501527

ABSTRACT:
A displacement controlled hydraulic proportional valve has a spring retainer and a force feedback spring serially disposed between a pilot valve spool and a main valve spool in a control chamber. An arcuate convex end portion on the pilot valve spool extends into a cylindrical pocket in the spring retainer essentially defining a contact point through which force is transferred between the pilot valve spool and the retainer. The point contact minimizes side loading on the pilot valve spool due to buckling of the feedback spring to minimize tendency of the pilot valve spool to stick during operation.

REFERENCES:
patent: 4201116 (1980-05-01), Martin
patent: 5144983 (1992-09-01), Schwelm

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