US PATENT SUBCLASS 251 / 30.05
.~.~.~.~ Fluid pressure sole means for biasing valve closed

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}
30.05.~.~.~.~ Fluid pressure sole means for biasing valve closed

DEFINITION

Classification: 251/30.05

Fluid pressure sole means for biasing valve closed:

(under subclass 30.02) Subject matter in which the force per unit area exerted by a fluent material is the only agent used to maintain the main valve in the position.