US PATENT SUBCLASS 91 / 438
.~.~ Held closed by motive fluid pressure

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

418  DF  WITH MOTIVE FLUID VALVE {32}
437  DF  .~ Independent control of bypass between opposed working chambers {1}
438.~.~ Held closed by motive fluid pressure {1}
439  DF  .~.~.~> Bypass through supply line

DEFINITION

Classification: 91/438

(under subclass 437) Apparatus in which the valve means controlling the by-pass is held in position to close the by-pass by the pressure of motive fluid applied to the motor.