| 摘要 |
A device inserted in the positive crank case ventilation (PCV) line of an internal combustion engine includes a restricted passageway in the PCV line, and two valve assemblies symmetrically arranged with respect to the restricted passageway. Each valve assembly includes a secondary passageway joining the restricted passageway with a closed valve chamber through a valve seat. A balanced movable valve part in the valve chamber is biased away from the valve seat by a first coil spring in the secondary passageway and is biased toward the valve seat by a second coil spring in the valve chamber. The valve chamber is frusto-conical and tapers inwardly away from the valve seat. The valve member is convex at both its ends and thus forms a restriction with the valve seat at one extreme of its travel, and a restriction with the wall of the valve chamber at the other extreme of is travel. The device increases gasoline mileage and power, and reduces undesirable gaseous emissions.
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