The compressed air from the gas source contains excessive water vapor and oil droplets, as well as solid impurities, such as rust, sand, pipe sealant, etc., which will damage the piston sealing ring, block the small vent holes on the components, shorten the service life of the components or make them invalid. The function of the air filter is to separate the liquid water and liquid oil drops in the compressed air, and filter the dust and solid impurities in the air, but it can not remove the gaseous water and oil.
