US PATENT SUBCLASS 91 / 378
.~.~.~.~ Axially movable spool-type valve

Current as of: June, 1999
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91 /   HD   MOTORS: EXPANSIBLE CHAMBER TYPE

358 R  DF  WORKING MEMBER POSITION FEEDBACK TO MOTIVE FLUID CONTROL {12}
368  DF  .~ Follower type {9}
374  DF  .~.~ Plural movable valve parts {2}
376 R  DF  .~.~.~ One movable part unitary with working member {3}
378.~.~.~.~ Axially movable spool-type valve

DEFINITION

Classification: 91/378

(under subclass 376) Apparatus in which the movable valve parts comprise a ported sleeve and a spool mounted within the sleeve, said sleeve and spool being both movable along the axis thereof to control the flow of motive fluid.