The full-flow oil filter of the oil filter shall be subjected to the following tests in accordance with the ISO4548 standard.

(1) Pressure drop-flow characteristic test Use oil of specified viscosity to determine the pressure drop-flow curve of the oil filter assembly.

(2) The characteristic test of the filter element bypass element is 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, when the bypass element is lower than the specified opening pressure drop, a small amount of oil leakage is allowed; and when the filter element is completely blocked, it can be bypassed Pass the full flow without exceeding the specified pressure drop.

(3) High pressure drop and high temperature characteristic 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 the high temperature of the oil, and the ability of the filter element to withstand high pressure drops without being damaged should be tested under simulated high temperature conditions.

(4) The filter element life and filtration efficiency test uses the particle counting method to determine the filter element. During the test, draw the relationship curve of pressure difference-test time or pressure difference-ash weight to achieve 75% of the design opening pressure of the bypass valve. Or the weight of contaminants to indicate the life of the filter element.

(5) When the cumulative efficiency test uses gravimetric analysis to determine the life of the filter element, it is evaluated by the test time when the end-point pressure difference is reached or the amount of pollutants captured.

(6) The hydraulic pulse fatigue test oil filter is subject to the fluctuating pressure in the engine cooling state during use. During the test, use the specified pulsating oil pressure to cycle 1000 times to determine the pressure resistance of the oil filter housing, seal ring and filter element against high pressure fluctuations.

(7) Vibration fatigue test After installing the machine stain filter assembly, add the frequency and amplitude of resonance caused by the vibration surface of the engine or installation structure, maintain the specified oil pressure, and cycle 10 million times to ensure that there is no small leakage Oil stains or fatigue damage performance.

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