US PATENT SUBCLASS 251 / 30.03
.~.~.~.~ Venting passage within movable main 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}
30.01  DF  .~.~ Electrically actuated pilot valve {1}
30.02  DF  .~.~.~ Main valve biased closed by fluid pressure {2}
30.03.~.~.~.~ Venting passage within movable main valve {1}
30.04  DF  .~.~.~.~.~> Pilot valve movably mounted within or around main valve

DEFINITION

Classification: 251/30.03

Venting passage within movable main valve:

(under subclass 30.02) Subject matter in which the valve is opened by releasing pressure through a passageway in a movable portion of the valve.