| 摘要 |
The crankcase for an internal combustion engine is vented to the fuel-air inlet induction passage via a ventilation valve comprising a tubular L-shaped valve housing having a comparatively small metering orifice which cooperates with a movable valve element responsive to decreasing pressure in the induction conduit for restricting the orifice. A coil spring yieldingly opposes closing movement of the valve element and is seated on a spring retainer adjustably mounted in an opening through the sidewall of the housing at the exterior angle of its elbow to effect a predetermined rate of gas flow through the orifice when a predetermined low-pressure differential corresponding to part load operation of the engine is applied across the orifice. A movement limiting plunger extends adjustably through the retainer to engage and limit closing movement of the valve element to effect a predetermined low rate of gas flow through the orifice when a predetermined high-pressure differential is applied across the orifice corresponding to engine idling.
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