US PATENT SUBCLASS 137 / 493.1
.~.~ One head and seat carried by head of another

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.~.~ One head and seat carried by head of another {3}
493.2  DF  .~.~.~> Supporting valve only spring biased
493.3  DF  .~.~.~> Supporting valve spring carried by supporting valve {2}
493.6  DF  .~.~.~> Both valves spring biased

DEFINITION

Classification: 137/493.1

(under subclass 493) Apparatus wherein one valve head carries the head and seat of a second valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

512.2, for other plural direct response valves having this relationship.

614.17, for similar structure in serial flow valves.