US PATENT SUBCLASS 137 / 321
.~.~.~ Combined rotary and longitudinal movement of valve

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

315  DF  WITH REPAIR, TAPPING OR ASSEMBLY MEANS {6}
317  DF  .~ Tapping a pipe, keg, or apertured tank under pressure {4}
320  DF  .~.~ With valved closure or bung {3}
321.~.~.~ Combined rotary and longitudinal movement of valve

DEFINITION

Classification: 137/321

(under subclass 320) Devices in which the valve means of the system comprises a head which moves axially and rotationally with respect to its seat, usually as a result of being engaged with a screw type actuator or tap.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

215+, for valves of general utility operated by a mechanical movement which imparts plural movements to the valve head.