US PATENT SUBCLASS 251 / 226
.~.~ Biased

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

213  DF  MECHANICAL MOVEMENT ACTUATOR {10}
215  DF  .~ Plural motions of valve {5}
226.~.~ Biased {1}
227  DF  .~.~.~> Spring

DEFINITION

Classification: 251/226

(under subclass 215) Devices in which means are provided to bias the valve to open or closed position.