US PATENT SUBCLASS 251 / 50
.~.~ Line pressure connected dashpot or choke chamber

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

12  DF  FLUID ACTUATED OR RETARDED {12}
48  DF  .~ Dashpot or fluid controlled retarder or timer {5}
50.~.~ Line pressure connected dashpot or choke chamber {2}
51  DF  .~.~.~> With choke by-pass or relief means
52  DF  .~.~.~> Chamber fills on closing of main valve

DEFINITION

Classification: 251/50

(under subclass 48) Subject matter in which an expansible chamber device is in constantly open but restricted communication with the main flow line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

33+, for choked pressure type servo-motor actuators for valves.