US PATENT SUBCLASS 137 / 565.14
.~.~.~.~ And pilot valve

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

561 R  DF  SYSTEMS {32}
565.01  DF  .~ With pump {11}
565.11  DF  .~.~ Pumped fluid control {3}
565.13  DF  .~.~.~ Fluid pressure responsive {2}
565.14.~.~.~.~ And pilot valve

DEFINITION

Classification: 137/565.14

And pilot valve:

(under subclass 565.13) Subject matter comprising an auxiliary controlling operation of a fluid pressure operator valve. [figure] [caption]Figure 1: A typical example of the subject matter. A - Reservoir; B - Fluid; C - Main flowline; D - Pump; E - Discharge; F - Pilot valve; G - Control circuit.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

25+, for a pilot or servotype with an alternative pressure source or pilot valve, subclasses 28+ for a fluid actuated pilot valve, subclasses 30.01+ for an electrically actuated valve, and subclasses 118+ for a material guide or restrictor.

417, Pumps,

252, for a pressure responsive interstage discharge and subclass 428 for a bypass control.