US PATENT SUBCLASS 251 / 28
.~.~ Fluid actuated pilot valve


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.~.~ Fluid actuated pilot valve {1}
29  DF  .~.~.~> With additional pilot valve control


DEFINITION

Classification: 251/28

(under subclass 25) Subject matter in which the auxiliary or pilot valve controlling the main valve is operated by a fluid responsive device.

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32, for latched pilot valves for fluid servo-motors with fluid pressure means to release the latch.

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137, Fluid Handling,

105, for such systems in which the pilot valve is itself controlled by the main valve. These are generally suction operated milker pulsators and subclasses 485+ for line condition change responsive valves having fluid actuated pilot valve means which responds to changing pressures or flow conditions in the line.