US PATENT SUBCLASS 137 / 492
.~.~.~ Single acting fluid servo

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}
492.~.~.~ Single acting fluid servo {1}
492.5  DF  .~.~.~.~> Spring biased

DEFINITION

Classification: 137/492

(under subclass 488) Apparatus in which the fluid pressure servo-motor operates the flow controlling valve in one direction only, the valve being operated the other direction by a constantly acting pressure or bias.