US PATENT SUBCLASS 137 / 637.5
.~.~.~.~ Concentric, central valve removable

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

561 R  DF  SYSTEMS {32}
637  DF  .~ Valves with separate, correlated, actuators {3}
637.2  DF  .~.~ Coaxial stems {1}
637.3  DF  .~.~.~ Rotary {2}
637.5.~.~.~.~ Concentric, central valve removable

DEFINITION

Classification: 137/637.5

(under subclass 637.3) Subject matter in which a rotary plug valve is within an outer concentric, separately actuated, rotary plug valve and so constructed that the central valve may be removed for repair or other purposes without disturbing the outer valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

614.16+, for a single flow path having plural serial valves in which one valve head provides a seat for another valve

head.