US PATENT SUBCLASS 251 / 29
.~.~.~ With additional pilot valve control

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

12  DF  FLUID ACTUATED OR RETARDED {12}
25  DF  .~ Pilot or servo type motor {8}
28  DF  .~.~ Fluid actuated pilot valve {1}
29.~.~.~ With additional pilot valve control

DEFINITION

Classification: 251/29

(under subclass 28) Subject matter in which the fluid responsive device that operates the pilot valve is controlled by an additional pilot valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

26, for plural alternative pilot valves, and see the search notes on plural pilot valves in the definition.