US PATENT SUBCLASS 137 / 614.16
.~.~ One valve head provides seat for other head

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

561 R  DF  SYSTEMS {32}
613  DF  .~ Flow path with serial valves and/or closures {7}
614.16.~.~ One valve head provides seat for other head {1}
614.17  DF  .~.~.~> Also carries head of other valve

DEFINITION

Classification: 137/614.16

(under subclass 613) Systems in which the movable element of one valve forms the seat for the movable element of another valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

637.5, for concentric rotary plug type valves having co-axial stems, the inner valve being removable without disturbing the outer valve.