1. The flow resistance characteristics of filter 

In the rated flow under the filter before and after the pressure difference, but also the value of the pressure loss, the smaller the value of the filter through the better. Rated flow generally take this: if the user provides the design flow of the oil pump or the actual flow of the new oil pump, the flow rate of the flow of the oil pump flow 50-60%. There is also a design flow of the main oil passage of the internal combustion engine to the filter Designer. In this case, the filter flow value should be set in the main oil channel design flow of 1.5-2.0 times. This is because with the normal wear of the internal combustion engine, the main oil flow will increase accordingly to maintain the normal oil pressure. General requirements of the full flow filter in the rated flow of the original resistance should not be greater than 0.025 MPa.

2. Filtration efficiency of new filter element

Define the filtration efficiency of the new filter element, referred to as the original filtration efficiency, requirements>=60%. Determination of the filtration efficiency, the size of AC ash containing a certain amount of oil, with about 10% of the rated flow or greater than 45Kpa under the pressure of time through the filter, and after repeated washing, analysis of impurity content in oil filter, we can calculate the original filtration efficiency, with particle size of AC ash results in different.

3. Filter life characteristics

From the beginning of a new filter to plug, that is, before and after the filter pressure difference to achieve 70% of the filter bypass valve opening pressure. In the determination of blocking filter life life test bench, the test oil in uniform test adding impurities, filter speed simulation under actual conditions of use jam. During the experiment, every 20 or 30min record filter pressure difference before and after the end of the experiment, when the pressure reaches 70kpa, so far, the number of hours or have been added as the total amount of impurity test, evaluation index of the filter life, in the life test process, but also determined the filtering efficiency of the filter, called the cumulative filtration efficiency, change the filtration efficiency of filter blockage in the process in the representative. The efficiency of the filter is more comprehensive than the original efficiency.