| 摘要 |
A filter assembly has a housing closed at one end and open at the other end. An annular filter media/core assembly including first and second end caps is disposed in the housing. An end plate having a plurality of first and second inlet openings and an outlet opening is disposed in the open end of the housing. A combination valve, which is retained between the second end cap of the filter media/core assembly and the end plate, has a first anti-drainback portion that cooperates with the first inlet openings in the end plate and a second bypass portion that cooperates with the second inlet openings. One or more slits are provided in a circle in the first anti-drainback portion. The slits are constructed and arranged to cooperate with the first inlet openings to open to allow fluid flow through the first anti-drainback portion in a reverse direction during initial engine fill, and to close and provide a functional seal when the first anti-drainback portion operates normally. In normal use, fluid will pass through the first inlet openings, the filter media/core assembly and be discharged from the housing through the outlet opening. When the filter media begins to clog, pressure will build and upon attainment of a predetermined pressure the second bypass portion will open the second inlet openings and fluid flow can pass through the second inlet openings to the outlet opening, for discharge from the filter assembly, thereby bypassing the filter media.
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