US PATENT SUBCLASS 137 / 191
.~.~.~.~.~.~.~.~ Servo-control

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

154  DF  DIVERSE FLUID CONTAINING PRESSURE SYSTEMS {7}
171  DF  .~ Fluid separating traps or vents {5}
177  DF  .~.~ Discriminating outlet for liquid {4}
183  DF  .~.~.~ With fluid responsive valve {3}
187  DF  .~.~.~.~ Level responsive {2}
188  DF  .~.~.~.~.~ Weight or pressure {1}
189  DF  .~.~.~.~.~.~ Gravitating vessel {1}
190  DF  .~.~.~.~.~.~.~ Sinking or bucket type float {1}
191.~.~.~.~.~.~.~.~ Servo-control

DEFINITION

Classification: 137/191

(under subclass 190) Separating traps wherein the float operates a servo-mechanism or pilot valve controlled device which in turn operates the valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

195, for servo control with level responsive means of the float type in these devices.

412+, for servo relay operation of control in float controlled valves.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation, 25+, for fluid pressure type servo-motors for valve actuation, and see the search notes to subclass 25 and subclasses 129+ for electrical actuators for valves.