US PATENT SUBCLASS 137 / 512
.~.~ Plural

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.~.~ Plural {6}
512.1  DF  .~.~.~> Dividing and recombining in a single flow path {1}
512.2  DF  .~.~.~> One valve carries head and seat for second valve
512.3  DF  .~.~.~> Diverse types
512.4  DF  .~.~.~> Integral resilient member forms plural valves
512.5  DF  .~.~.~> With common biasing means
513  DF  .~.~.~> Mechanically interconnected

DEFINITION

Classification: 137/512

(under subclass 511) Apparatus including more than one valve of the type.

(1) Note. See the class definition, section 3 for search notes on plural automatic valves.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247.17, for plural direct response valves combined with liquid seal means.

506+, for plural line condition responsive valves including at least one valve which has a separate connected fluid reactor surface.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

631+, for cyclic valves and their actuators, and see the search notes to subclass 631.