3, oil filter full-flow oil filter should be in accordance with ISO4548 standard for the following tests.
　　(1) pressure fall-flow characteristic test determine the pressure fall-flow curve of the oil filter assembly with an oil of specified viscosity.
　　(2) filter element bypass characteristics test to determine the filter element pressure drop - bypass flow curve. When the pressure drop through the filter element is low, in order to limit the amount of unfiltered oil, the bypass element can allow a small amount of oil leakage when the pressure drop is lower than the specified open pressure drop. When the filter element is completely blocked, the full flow can be bypassed without exceeding the specified pressure drop.
　　(3) high pressure drop and high temperature performance test the oil filter will experience high pressure drop during operation (especially when the filter element is blocked). In addition, the filter element is also affected by high oil temperature, should be simulated under high temperature conditions to test the filter element withstand high pressure drop without damage.
　　(4) the filter element life and filter efficiency test adopted particle counting method to determine the filter element's following orders. During the test, the relationship curve of pressure difference -- test time or pressure difference -- added ash weight was drawn to express the filter element life by reaching the test time or pollutant weight at 75% of the designed opening pressure of bypass valve.
　　(5) when the filter element life is measured by gravimetric method in cumulative efficiency test, the test time when the pressure difference at the end of test is reached or the catch of pollutants is evaluated.
　　(6) hydraulic pulse fatigue test oil filter in use to be subject to the engine cooling state fluctuation of pressure. During the test, the specified pulsating oil pressure shall be used for 1000 cycles to determine the pressure resistance of the oil filter shell, sealing ring and filter element to high pressure fluctuation.
　　(7) vibration and fatigue test after installing the filter assembly of machine, add the frequency and amplitude of resonance caused by the vibration surface of engine or installation structure, maintain the specified oil pressure and circulate 10 million times to determine the performance without small oil leakage or fatigue damage.
　　This article is organized by dongguan oneness filtration technology co., LTD