US PATENT SUBCLASS 91 / 485
.~.~ Disc valve

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  DF  .~ Control valve seating surface contact maintained by fluid pressure bias {1}
485.~.~ Disc valve

DEFINITION

Classification: 91/485

(under subclass 484) Apparatus in which said pair of relatively slidable valve face portions are substantially flat and abut in a common plane, one of said face portions being mounted for movement relative to the other.