US PATENT SUBCLASS 251 / 35
.~.~.~ Variable choke passage according to valve position

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

12  DF  FLUID ACTUATED OR RETARDED {12}
25  DF  .~ Pilot or servo type motor {8}
33  DF  .~.~ Choked pressure type servo motor {8}
35.~.~.~ Variable choke passage according to valve position

DEFINITION

Classification: 251/35

(under subclass 33) Subject matter in which the choke or restricted communication between the servo-motor chamber and the region of either high or low pressure varies in accordance with the degree of opening or closing of the main valve.

(1) Note. The variation may be either abrupt or progressive with the travel of the valve.

(2) Note. The variation may result from changing the size of the pilot communication lines or from providing an additional or alternative path for fluid shunting the choke which is open at the proper time to accelerate or delay valve operation.