The compressed air from the air source contains excessive water vapor and oil droplets, as well as solid impurities such as rust, sand particles, pipeline sealant, etc. These can damage the piston sealing ring, block small exhaust holes on the components, shorten the service life of the components or make them ineffective. The function of the air filter is to separate the liquid water and liquid oil droplets in the compressed air, and filter out dust and solid impurities in the air, But gaseous water and oil cannot be removed.

The main performance indicators of air filters are filtration accuracy:

Refers to the maximum diameter of impurity particles allowed to pass through. The key to affecting filtration accuracy is the filter element, which can be selected according to the needs of subsequent components to achieve the corresponding filtration accuracy.

Flow characteristics

It refers to the relationship curve between the air flow rate through the filter and the pressure drop at both ends of the filter under a certain inlet pressure. In practical use, it is best to choose within the range of pressure loss less than 0.03MPa. In air filters, the main factors that affect the flow characteristics are the body and filter element.

Water separation efficiency

The ratio of separated moisture to the moisture content in the air at the inlet. It is generally required that the water separation efficiency of the air filter be not less than 80%. The main factor affecting the water separation efficiency is the guide plate.

The purpose is to obtain clean air that can meet standards. Generally, ventilation filters are designed to capture and adsorb dust particles of different sizes in the air, improving air quality. Chemical filters can not only adsorb dust but also odor, and are commonly used in biopharmaceuticals, hospitals, airport terminals, residential environments, and other places. Filters used for general ventilation have a wide range of applications, including the microelectronics industry, coating industry, food and beverage industry, and so on. That is to say, filters are just a means to achieve the goal of cleanliness. In summary, air filters mainly remove mechanical impurities such as dust and dust from the air.