Diesel filters work mainly in the following ways:
1. ** Physical filtering **
- ** Blocking particles ** : The diesel filter has a layer of filter paper or filter inside, and the micropores in it can block solid particles. When the diesel passes through the filter paper or screen, the particulate matter is trapped by the filter paper or screen, while the pure diesel runs through the filter paper or screen into the fuel system.
- ** Pre-filter and main filter cooperation ** : the filter element is often equipped with a pre-filter layer and the main filter layer. The pre-filter layer is used to filter large particles and impurities to avoid them blocking the main filter element and prolong the service life of the main filter element. The main filter layer further filters smaller impurities to ensure a high degree of fuel cleanliness.
2. ** Chemical filtration **
- ** Adsorption and Neutralization of acids ** : The chip and filter paper in the diesel filter are coated with a special chemical sol that can adsorb and neutralize acids in the diesel. These acidic substances often come from the oxidation and pollution of diesel fuel, causing corrosion and wear to the fuel system. Through chemical adsorption and neutralization, the filter can purify the acid in diesel oil and prevent it from adversely affecting the fuel system.
3. ** Water separation **
- ** Concentrate moisture and discharge ** : The filter element is also equipped with a separation layer for separating moisture and small particles. On the one hand, the separation layer can concentrate the water and provide a way to discharge, on the other hand, it can avoid small particles blocking the filter, and maintain the filter efficiency and service life of the filter.
4. ** Other auxiliary functions **
- ** Anti-backflow and cleanliness: There is usually a valve or anti-backflow device outside the filter element, which is used to keep the filtrate inside the filter element from backflowing when the engine stops running, so as to ensure the cleanliness of the fuel when the engine is started next time.
- ** Pressure monitoring and warning ** : Diesel filters are often equipped with a warning device to detect whether the pressure inside the filter element exceeds the limit value. Once the limit value is exceeded, the warning device will start to remind the user to replace the filter element.
In summary, diesel filters work together through physical filtration, chemical filtration, water separation and other ways to effectively remove impurities, moisture and pollutants in diesel, protect the normal operation of the engine fuel system, prolong the service life of the engine, and improve fuel efficiency.