Hydraulic oil is used as the energy transmission medium for the hydraulic system of engineering machinery. It plays an important role in energy transfer, system lubrication, anti-corrosion, rust and cooling in the hydraulic system. The cleanliness of hydraulic oil directly affects the working performance of the hydraulic system，and the life of hydraulic components, etc., so the application of filtration technology in engineering machinery hydraulic systems is more extensive. The filtration of hydraulic oil is a key technology. Once the hydraulic oil cleanliness is in trouble, it will affect the normal operation of construction machinery and equipment.

The hydraulic oil filtration technology utilizes the lipophilic hydrophobic technology and the "cavitation" principle, the contact area of the oil in the vacuum separator is expanded by hundreds of times, and the "cavitation" system increases the surface area of the oil evaporation, while The evaporation interface is constantly updated, the stroke of the oil and the region of static moisture volatilization in the vacuum system are maximized so that the moisture in the oil evaporates rapidly under conditions of low heat, high vacuum, large surface area and high pumping speed, and is discharged through the vacuum system. The water and gas discharged from the upper part of the vacuum separator are cooled and dehumidified step by step through the cooling system, and finally discharged into the air by the vacuum pump. The dry oil after vacuum dehydration in the vacuum separator is raised from the negative pressure to the positive pressure by the oil pump. After the fine filtration, the clean oil is discharged from the oil outlet to complete the whole oil purification process.

Hydraulic oil filtration technology is an important technology for system protection in construction machinery. Because hydraulic oil has the function of transmitting pressure, maintaining lubrication, and cooling and sealing in the system, if it is improperly selected, it will cause system failure and pollution. Therefore, when selecting hydraulic fluid, it should be carried out in accordance with the corresponding rules and correct operating procedures.

Xinxiang D.King Filter Industry Co., Ltd's hydraulic filter has a minimum dimensional tolerance of 0.01mm. It uses special materials to reduce pressure loss, while the size and precision can be customized. It belongs to the special filter for the power plant and steel plant hydraulic system. Exported to more than 30 countries and regions, such as the United States, Germany, Thailand, Australia, United Arab Emirates, Saudi Arabia, Romania, Panama, Brazil, the Philippines, Malaysia, Chile, Peru, India, the Middle East and so on.