US PATENT SUBCLASS 91 / 268
.~.~ Exhaust valve closed or held closed by inlet fluid (442)


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91 /   HD   MOTORS: EXPANSIBLE CHAMBER TYPE

218  DF  CYCLICALLY OPERABLE {34}
265  DF  .~ Relatively movable inlet and exhaust valves {6}
268.~.~ Exhaust valve closed or held closed by inlet fluid (442)


DEFINITION

Classification: 91/268

(under subclass 265) Apparatus in which cyclic admission of motive fluid is provided by operation of the inlet valve means and exhaust is provided by opening of an exhaust valve which is cyclically moved to or held in its closed position by pressure or flow of the motive fluid cyclically admitted by the inlet valve means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

442, for expansible chamber motors, other than cyclically operable, having a self opening exhaust valve held closed by inlet pressure.