US PATENT SUBCLASS 91 / 294
.~.~.~.~ Pilot valve operated by separately controlled fluid motor

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

218  DF  CYCLICALLY OPERABLE {34}
281  DF  .~ Working member controlled motive fluid for distributor motor {12}
290  DF  .~.~ Working member traverses pilot port in working chamber side wall {9}
293  DF  .~.~.~ With passage from port controlled by pilot valve {1}
294.~.~.~.~ Pilot valve operated by separately controlled fluid motor

DEFINITION

Classification: 91/294

(under subclass 293) Apparatus in which the cyclically operated valve is operated by a fluid motor the fluid supply or exhaust of which is controlled separately from the distributor motor supply.

(1) Note. The pilot valve motor supply or exhaust is usually controlled by the distributor motor working member.