US PATENT SUBCLASS 137 / 493.2
.~.~.~ Supporting valve only spring biased

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
493  DF  .~ Bi-directional flow valves {4}
493.1  DF  .~.~ One head and seat carried by head of another {3}
493.2.~.~.~ Supporting valve only spring biased

DEFINITION

Classification: 137/493.2

(under subclass 493.1) Apparatus wherein only the carrying valve is provided with spring biasing means.