Flow force compensating stepped shape spool valve

Details Flow force compensating stepped shape spool valve Flow force compensating stepped shape spool valve

2005-10-25

2005-10-25

Michalsky, Gerald A. (Department: 3753)

Fluid handling

Systems

Multi-way valve unit

C251S282000

Reexamination Certificate

active

06957665

ABSTRACT:
Disclosed is a flow force compensating spool valve having a flow force compensating protrusion ring at a supply channel of a sleeve on an outer circumference portion of a spool rod, and a hydraulic valve, a pneumatic valve, a three-way valve, and a four-way valve using the spool valve, in which the flow force can be compensated by a simple structure change of the spool without changing a structure of the sleeve.

REFERENCES:
patent: 3123335 (1964-03-01), Darling
patent: 3807454 (1974-04-01), Westveer
patent: 4155535 (1979-05-01), Seamone
patent: 4220178 (1980-09-01), Jackson
patent: 4313467 (1982-02-01), Lang
patent: 4646786 (1987-03-01), Herder et al.
patent: 4651776 (1987-03-01), Nakano et al.
patent: 5329841 (1994-07-01), Sauer et al.
patent: 5944042 (1999-08-01), Takahashi et al.
patent: 2003/0024581 (2003-02-01), Nakamura et al.

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