US PATENT SUBCLASS 137 / 489.5
.~.~.~.~ Pilot controls supply to pressure chamber

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
485  DF  .~ Pilot or servo controlled {3}
488  DF  .~.~ Fluid pressure type {2}
489  DF  .~.~.~ Choked or throttled pressure type {4}
489.5.~.~.~.~ Pilot controls supply to pressure chamber

DEFINITION

Classification: 137/489.5

(under subclass 489) Devices in which the valved passage is so positioned that the pilot valve controls the ingress of the pressure fluid to the pressure chamber.