US PATENT SUBCLASS 137 / 625.34
.~.~.~.~ Spool

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

561 R  DF  SYSTEMS {32}
625  DF  .~ Multi-way valve unit {12}
625.28  DF  .~.~ Dividing into parallel flow paths with recombining {4}
625.33  DF  .~.~.~ Reciprocating {2}
625.34.~.~.~.~ Spool {2}
625.35  DF  .~.~.~.~.~> With internal passage
625.36  DF  .~.~.~.~.~> Unequal heads

DEFINITION

Classification: 137/625.34

(under subclass 625.33) Devices having a spool type valve (i.e., two port controllers immovably mounted on a single valve stem, said controllers coacting with co-axial seats).

SEE OR SEARCH THIS CLASS, SUBCLASS:

628+, especially subclasses 630.19+ for spool type valves having heads with relative movement with respect to each other.