US PATENT SUBCLASS 251 / 166
.~.~.~.~.~ With slip coupling

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}
158  DF  .~ With positive reduction {3}
160  DF  .~.~ Rotary valve {3}
164  DF  .~.~.~ Screw {1}
165  DF  .~.~.~.~ Non-reciprocating {1}
166.~.~.~.~.~ With slip coupling

DEFINITION

Classification: 251/166

(under subclass 165) Subject matter wherein a clutch or slip coupling is provided between the actuator and the valve to permit the valve to be relieved of the additional seating pressure before actuation or to increase the seating pressure after actuation.