US PATENT SUBCLASS 251 / 193
.~ Gate valve

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}
193.~ Gate valve {3}
194  DF  .~.~> Screw sole actuator of expander and valve
195  DF  .~.~> Bifaced {4}
203  DF  .~.~> Cam or wedge {1}

DEFINITION

Classification: 251/193

(under subclass 157) Devices applied to a gate valve to move its face element in a direction lateral to that of movement of a valve element carrier toward the valve seat.

SEE OR SEARCH THIS CLASS, SUBCLASS:

177+, for pivoted gates with spring means to increase head

and seat contact pressure.