US PATENT SUBCLASS 251 / 187
.~ Separate actuators or actuator motion

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

157  DF  WITH MEANS TO INCREASE HEAD AND SEAT CONTACT PRESSURE {8}
187.~ Separate actuators or actuator motion {2}
188  DF  .~.~> Rotary valve
189  DF  .~.~> Piston with expansible packing

DEFINITION

Classification: 251/187

(under subclass 157) Devices comprising a different actuating means for valving and pressing motion, or different functions of the same actuator.

SEE OR SEARCH THIS CLASS, SUBCLASS:

161, for independent actuation of both pressure increase and pressure reduction.