External centering spring adjustment for a spool valve

Details External centering spring adjustment for a spool valve External centering spring adjustment for a spool valve

1977-01-17

1979-01-02

Schwadron, Martin P.

Fluid handling

With casing, support, protector or static constructional...

Guards and shields

13762563, 13762566, F16K 2708, F16K 1107, F15B 13042

Patent

active

041322452

ABSTRACT:
A pilot-operated spool valve including a valve body, a bore in the body, ports in the body and extending to the bore, a spool in the bore and axially shiftable therein, at least one pilot associated with an end of the spool for applying a shifting force to the spool, at least one spring in the body for applying a biasing force to the spool, and an adjustment for the biasing spring including a rotatable and axially movable member received in the body and engaging the spring, a cam surface in the form of interengaging threads on the member and the body for axially moving the member in response to rotation thereof, a rotatable actuator for rotating the member, a mount for the actuator so that the actuator can rotate only and is restrained against axial movement, and an axially extendable connection between the actuator and the member.

REFERENCES:
patent: 304271 (1884-08-01), Lunkenheimer
patent: 3084710 (1963-04-01), Gondek
patent: 3473566 (1969-10-01), Peppel
patent: 3749128 (1973-07-01), Sallberg et al.
patent: 3773083 (1973-11-01), Hagve et al.

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