US PATENT SUBCLASS 137 / 509
.~.~ Valve seating in direction of flow

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
494  DF  .~ With separate connected fluid reactor surface {8}
509.~.~ Valve seating in direction of flow {1}
510  DF  .~.~.~> Flexible diaphragm or bellows reactor

DEFINITION

Classification: 137/509

(under subclass 494) Apparatus wherein the valve controlling the fluid flow is seated by moving in the direction of flow of the fluid.