US PATENT SUBCLASS 137 / 512.2
.~.~.~ One valve carries head and seat for second valve

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
511  DF  .~ Direct response valves (i.e., check valve type) {14}
512  DF  .~.~ Plural {6}
512.2.~.~.~ One valve carries head and seat for second valve

DEFINITION

Classification: 137/512.2

(under subclass 512) Devices in which one of the valves carries the seat for at least one other valve and also serves as the support for the other valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

493.1, for bi-directional flow valves of this type.