US PATENT SUBCLASS 239 / 572
.~.~ Downstream flow to outlet closes valve

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

569  DF  INCLUDING VALVE MEANS IN FLOW LINE {11}
570  DF  .~ Line fluid operated {2}
572.~.~ Downstream flow to outlet closes valve

DEFINITION

Classification: 239/572

(under subclass 571) Apparatus in which flow of fluid toward the egress port causes the valve to move to closing position; e.g., upstream opening and downstream closing by flow of the effluent.