US PATENT SUBCLASS 123 / 574
.~.~ Specific control valve (e.g., PCV valve)

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

434  DF  CHARGE FORMING DEVICE (E.G., POLLUTION CONTROL) {29}
572  DF  .~ Crankcase vapor used with combustible mixture {2}
574.~.~ Specific control valve (e.g., PCV valve)

DEFINITION

Classification: 123/574

Specific control valve (PCV valve):

(under subclass 572) Subject matter wherein said means include a valve having a specifically disclosed construction.

(1) Note. The valve is often referred to as a PCV (positive crankcase ventilation) valve.