US PATENT SUBCLASS 137 / 180
.~.~.~.~ Abnormal pressure responsive liquid blow-off or drain

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}
177  DF  .~.~ Discriminating outlet for liquid {4}
179  DF  .~.~.~ With non-discriminating gas vent or liquid discharge {2}
180.~.~.~.~ Abnormal pressure responsive liquid blow-off or drain

DEFINITION

Classification: 137/180

(under subclass 179) Separating traps wherein the additional liquid outlet or additional control of the liquid outlet responds to a system pressure either above or below the normal operating pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

493, for line condition change responsive valves operated by flow in either direction, i.e., high or low pressures on either side.