US PATENT SUBCLASS 239 / 533.8
.~.~.~ Regulator* biased to closed position by a fluid

Current as of: June, 1999
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239 /   HD   FLUID SPRINKLING, SPRAYING, AND DIFFUSING

533.1  DF  FLUID PRESSURE RESPONSIVE DISCHARGE MODIFIER* OR FLOW REGULATOR* {3}
533.2  DF  .~ Fuel injector or burner {1}
533.3  DF  .~.~ Having flow regulator* for reciprocating piston engine {7}
533.8.~.~.~ Regulator* biased to closed position by a fluid

DEFINITION

Classification: 239/533.8

(under subclass 533.3) Device having a secondary source or path of fluid pressure to which the regulator responds, such secondary pressure acting to urge the regulator in a direction (usually closed) opposite that of the primary fluid. The secondary fluid may be the same fluid as the primary fluid but acting through a different path.