US PATENT SUBCLASS 251 / 18
.~.~.~.~ Manual and pilot valves

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

12  DF  FLUID ACTUATED OR RETARDED {12}
15  DF  .~ Compulsory cut-off after flow period {6}
16  DF  .~.~ Serial main line cut-off and manual valves (e.g., hydraulic "fuses") {1}
17  DF  .~.~.~ Interconnected motion {1}
18.~.~.~.~ Manual and pilot valves

DEFINITION

Classification: 251/18

(under subclass 17) Subject matter in which the fluid actuated or retarded valve is controlled by a pilot valve that is interconnected with and moved by the manual valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

25+, for fluid servo-motor actuated valves, and see the search notes to subclass 25.