The bottom of the paper filter element is equipped with bypass valve, which is a direct oil flow channel designed to ensure the smooth circulation of oil back to the engine when the engine oil viscosity is high in cold start or the paper filter element is partially or completely blocked. When the oil opens the bypass valve under the pressure of the oil pump, the oil circulating back to the engine through the bypass valve will not only not be filtered by the paper filter element, but also will be the original has been filtered out by the paper filter element large particle impurities, by the bypass valve back to the engine, to bring uninterrupted secondary wear to the engine. As can be seen from the above two shortcomings, the impurities larger than or smaller than the paper filter core microholes have no permanent filtering effect, only those impurities equal to the paper filter core microholes and embedded in the paper filter core microholes have permanent filtering effect, so the filtering efficiency is very low.
　　This article is organized by dongguan oneness filtration technology co., LTD