US PATENT SUBCLASS 91 / 180
.~.~ Rotary valve

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

170 R  DF  RELATIVELY MOVABLE WORKING MEMBERS WITH ONE HAVING MOTIVE FLUID CONTROLLED BY, MOVABLY INTERCONNECTED WITH OR MOVED BY ANOTHER {12}
178  DF  .~ Single valve unit controlling plural working chambers {2}
180.~.~ Rotary valve

DEFINITION

Classification: 91/180

(under subclass 178) Apparatus having a means to impart a continuous relative rotation of the valve member and housing.

SEE OR SEARCH THIS CLASS, SUBCLASS:

484+, for motors having three or more cylinders arranged in parallel, radial, or conical relationship with a rotary transmission axis in which relatively movable parts of the motive fluid control valve therefor (usually of the rotary type) as fluidly biased into seating engagement.

487, for motors having three or more cylinders arranged in parallel, radial, or conical relationship with a rotary transmission axis in which motive fluid is directed to or from the motive fluid control valve interface, said control valve usually being of the rotary type.

498, for motors having three or more radially arranged cylinders and a centrally arranged relatively rotatable valve member.

503, for motors having three or more parallel cylinders and a rotary spool type motive fluid control valve.