US PATENT SUBCLASS 220 / 203.28
.~.~.~ Two-way pressure relief valve

Current as of: June, 1999
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220 /   HD   RECEPTACLES

200  DF  CLOSURES {45}
202  DF  .~ With condition responsive vent or valve {1}
203.01  DF  .~.~ Responsive to pressure {10}
203.28.~.~.~ Two-way pressure relief valve

DEFINITION

Classification: 220/203.28

Two-way pressure relief valve:

(under subclass 203.01) Device wherein the vent or valve provides for flow of the pressure medium in two or more directions.