US PATENT SUBCLASS 91 / 484
.~ Control valve seating surface contact maintained by fluid pressure bias

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

472  DF  THREE OR MORE CYLINDERS ARRANGED IN PARALLEL RADIAL OR CONICAL RELATIONSHIP WITH ROTARY TRANSMISSION AXIS {10}
484.~ Control valve seating surface contact maintained by fluid pressure bias {1}
485  DF  .~.~> Disc valve

DEFINITION

Classification: 91/484

(under subclass 472) Apparatus in which there is provided a valve having a pair of relatively slidable abutting face portions, relative sliding movement of said face portions serving to control admission or discharge of fluid to or from said working chambers, and valve face portions being biased into relative seating engagement by fluid actuated means which is either (1) located externally of said plural working chambers or (2) if located within a working chamber being mounted for movement relative to both the piston and cylinder forming said working chamber.