US PATENT SUBCLASS 251 / 247
.~.~.~ Weight

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

213  DF  MECHANICAL MOVEMENT ACTUATOR {10}
231  DF  .~ Lever {5}
236  DF  .~.~ Biased {3}
247.~.~.~ Weight

DEFINITION

Classification: 251/247

(under subclass 236) Apparatus wherein the bias is provided by gravity.

SEE OR SEARCH THIS CLASS, SUBCLASS:

338, for other weight biased valves.

SEE OR SEARCH CLASS

137, Fluid Handling,

519+, and 532+ for direct response valves which are weight biased.