Displacement controlled hydraulic proportional valve

Details Displacement controlled hydraulic proportional valve Displacement controlled hydraulic proportional valve

1993-07-06

1994-11-22

Michalsky, Gerald A.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

91387, 13762564, 251 47, F16K 31124

Patent

active

053662024

ABSTRACT:
A displacement controlled hydraulic proportional valve is provided with a dashpot disposed between a main valve spool and a pilot valve spool to stabilize the proportional valve. The dashpot includes a bore in a spring retainer engaging the main valve spool and a plunger axially extending from a spring retainer engaging the pilot valve spool with the plunger extending into the bore to define a dashpot chamber. The plunger is sized to permit restricted fluid flow thereby when the spools move relative to each other thereby dampening relative movement between the valve spools. Dampening the relative movement between the valve spools drastically reduces the amount of overshoot by the main valve spool.

REFERENCES:
patent: 3339573 (1967-09-01), Bahniuk
patent: 3757823 (1973-09-01), Knutson
patent: 3783901 (1974-01-01), Schneider et al.
patent: 4201116 (1980-05-01), Martin
patent: 4202171 (1980-05-01), Jurisch et al.
patent: 4719943 (1988-01-01), Perach
patent: 5144983 (1992-09-01), Schweim

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