US PATENT SUBCLASS 137 / 198
.~.~.~ With reverse flow stop or pressure regulating valve


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

154  DF  DIVERSE FLUID CONTAINING PRESSURE SYSTEMS {7}
171  DF  .~ Fluid separating traps or vents {5}
197  DF  .~.~ Discriminating outlet for gas {2}
198.~.~.~ With reverse flow stop or pressure regulating valve


DEFINITION

Classification: 137/198

(under subclass 197) Separating traps further provided with a pressure responsive valve in the gas outlet which prevents reverse flow or regulates the system gas pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

455+, for line condition change responsive valves, especially subclass 496 for those having separate reactor surface and closing in response to reverse flow, subclass 505 for the pressure regulating type, and subclasses 511+ for check valves, especially subclasses 517+ for those biased open.