| 摘要 |
<p>A closed crankcase emission control system (10) for an internal combustion engine (12) includes a replaceable filter element (73) having a ring of filter media (94) ; a first end cap (96) at one end of the media ring (94); a sump container defined by a second end cap (98) at the other end of the media ring and a cup-shaped valve pan (128) fixed to the second end cap; and a check valve (140) in the valve pan to block blow-by gas flow directly into the filter element during engine operation, and to allow collected oil to flow out of the sump container during engine idle or shut-down. A shut off valve (160, 200) is provided to prevent oil from passing through the emission control system to the engine. The shut off valve comprises a cylindrical float member (162) with a supporting body (164) and a seal (166), where the body includes a guide member (169). The float member could also be a ball valve (214, 272). The float member (162) floats with the level of oil in the housing, and can fluidly seal against a valve seat to prevent oil passing to the engine. The shut off valve can be incorporated into the filter element (73), into a central support tube (184) of the housing, or into the inlet or outlet fittings (268, 270) for the housing. Supporting structure (174, 218) is provided to maintain the float member in a proper orientation. A pressure relief valve (230) can also be provided upstream from the shut-off valve to relieve system pressure when the shut-off valve is closed.</p> |
