US PATENT SUBCLASS 123 / 90.28
.~ With nonvalving movement (e.g., about valve stem)

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

90.1  DF  POPPET VALVE OPERATING MECHANISM {19}
90.28.~ With nonvalving movement (e.g., about valve stem) {2}
90.29  DF  .~.~> Oscillating movement converted internally
90.3  DF  .~.~> Positive rotation provided by internal means

DEFINITION

Classification: 123/90.28

(under subclass 90.1) Device wherein means is provided for movement of the valve in addition to that of opening and closing.

(1) Note. Ordinarily this movement is in the form of rotation of the valve about the principal axis of its stem for such purposes as random seating surface engagement, seat cleaning, etc.

SEE OR SEARCH CLASS

137, Fluid Handling,

330+, for nonvalving motion in a valve of more general utility.

251, Valves and Valve Actuation,

56, for a pressure actuated valve of more general utility having plural motions of the valve, and subclasses 215+, for a mechanical movement actuated valve of more general utility having plural motions of the valve.