US PATENT SUBCLASS 251 / 348
.~ Biased valve

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

341  DF  VALVE ACTUATOR IS VALVE CASING OR EXTENSION THEREOF {5}
348.~ Biased valve

DEFINITION

Classification: 251/348

(under subclass 341) Devices in which the valve has one position which it will maintain under the influence of a spring or weight which comprises a biasing means, and movement of the casing causes the valve to assume a different position.