Solenoid valve

Details Solenoid valve Solenoid valve

1987-04-30

1988-09-06

Michalsky, Gerald A.

Fluid handling

Systems

Sequentially closing and opening alternately seating flow...

137 86, 13759617, 13759618, F15B 13044

Patent

active

047685557

ABSTRACT:
A two way closed-center solenoid valve provides effective areas upon the valve members which result in static pressure balancing of these members. Additional feedback areas are provided and exposed to fluid pressure which approximates a first time derivative of fluid pressure at an outlet port of the solenoid valve. Accordingly, an input signal is opposed dynamically approximately as a first time derivative of fluid pressure delivered to the output port. The feedback areas are larger in effective area than the effective areas upon the valve members to provide a favorable margin of feedback forces over static and dynamic frictions.

REFERENCES:
patent: 2804877 (1957-09-01), Rosenberger
patent: 4649803 (1987-03-01), Abel

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