US PATENT SUBCLASS 251 / 341
VALVE ACTUATOR IS VALVE CASING OR EXTENSION THEREOF


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

341VALVE ACTUATOR IS VALVE CASING OR EXTENSION THEREOF {5}
342  DF  .~> Jointed or flexible wall
343  DF  .~> Sleeve valve {2}
346  DF  .~> Plural motions of valve
347  DF  .~> Reciprocating valve
348  DF  .~> Biased valve


DEFINITION

Classification: 251/341

(under the class definition) Subject matter wherein the valve actuator comprises a part of the flow confining means which

is exposed to the fluid at a region ahead of the cut-off point, or an extension of such part.

SEE OR SEARCH THIS CLASS, SUBCLASS:

149+, for valves operated by coupling or conduit motion, and see the search notes thereto.

SEE OR SEARCH CLASS

166, Wells,

334.1, and the subclasses there noted, for well devices comprising valves operated by motion of the conduit supporting the valve, and see subclass 316 for the line between Classes 166 and 251.