The natural air inhaled by the air compressor contains impurity particles such as moisture and dust. Therefore, the compressed air compressed by the air compressor contains moisture and impurity particles. Besides, some lubricating oil will also become gaseous due to high temperature. If the compressed air containing the above impurities is directly delivered to the pneumatic system, it will greatly reduce the reliability of the pneumatic device system. And also will shorten its service life. Finally, it will increase the production cost of the enterprise.

In addition, if not install the precision compressed air filter at the rear end of the air compressor, the compressed air will suck in solid impurities such as rust that fall off the inner wall of the pipeline. If these impurities get caught in the sliding clearance of the directional control valve or the valve seat of the pressure control valve, it will cause malfunction.

When the air temperature drops, saturated water will be precipitated. If water enters the control circuit and components, it will cause corrosion of the pipe network system and components. And wash away the lubricating oil film. In addition, in special industries such as pharmaceuticals and food, it must use the sterilizing filters and deodorizing filters.

The main function of the coalescing precision filter is to filter impurities such as solid particles and fine dust in the compressed air. And it has a certain blocking effect on the moisture and oil mist in the compressed air. If you want to completely filter the moisture in the compressed air, you need to install a compressed air dryer at the back end of the precision filter for processing. That is, it is also necessary to install a refrigerated type air dryer and a desiccant air dryer for compressor according to the dew point requirements.