The performance of the diesel filter in accordance with the ISO standard.  In addition to the air cleaner performance test according to SAE standard, but also to meet the engine bench test, rated the intake amount of the original intake resistance requirements. Oil filter qualified must comply with the original design of the engine cylinder pressure, oil temperature, flow rate, viscosity and traffic conditions, and to consider the overall balance filter quality.

The hydraulic oil filter in the sample product manufacturer, or marked on the nameplate is the nominal filter precision, rather than absolute filtration precision, only through the test value can be said filtering ability. The hydraulic oil filter should also meet the requirements of pressure loss (total pressure filter is less than 0.1pma, the total pressure of oil return filter difference is less than 0.05Mpa), so as to ensure the optimal flow and filter life.