Hydraulic oil is the hydraulic medium used in hydraulic systems that utilize liquid pressure energy. It plays the roles of energy transfer , anti-wear, system lubrication, anti-corrosion , anti-rust , cooling , etc. in the hydraulic system . For hydraulic oil, the liquid viscosity requirements of the hydraulic device at the operating temperature and starting temperature should first be met. Since the viscosity change of the lubricating oil is directly related to the hydraulic action, transmission efficiency and transmission accuracy, the viscosity-temperature performance of the oil is also required. and shear stability should meet the various requirements proposed by different uses. There are many types of hydraulic oils, and their classification methods are different. For a long time, it has been customary to classify them according to their uses, and some are also classified according to oil type, chemical composition or flammability. These classification methods only reflect the classification of oil products, but lack systematicity, and it is difficult to understand the interrelationship and development of oil products.   definition   Biodegradable hydraulic oil is developed to meet environmental protection requirements and control environmental pollution. There are mainly vegetable base oils and synthetic vinegar. Vegetable oils are the main development direction of environmentally friendly lubricants due to their natural biodegradability, excellent lubrication properties and viscosity-temperature properties, as well as abundant resources and relatively low prices . There is no official product hydraulic oil for this kind of hydraulic oil in our country. However, there are many abroad, such as Ruianbo from the United States, which are formulated from vegetable oil base oil and can eventually degrade.   Biodegradable hydraulic oils are high-performance, anti-wear hydraulic oils specifically formulated to meet the requirements of a variety of hydraulic equipment. This series of products can extend the service life of oil/oil filters and protect equipment most effectively, thereby reducing maintenance costs and product disposal expenses. This series of products was developed jointly with major equipment manufacturers to meet the stringent requirements of high hydraulic pressure and high output pumps installed in precision hydraulic systems. It can also cope with the requirements of other components of the hydraulic system, such as low-clearance servo valves and high-precision CNC machine tools . strict requirements. This series of products widely meets the most stringent performance requirements of various hydraulic system and component manufacturers designed using multi-metallurgical technologies, and a single product has outstanding performance characteristics.   Quality requirements   Hydraulic systems in automobiles and construction machinery use hydraulic oil as the working medium. The flow rate of the oil in this type of hydraulic system is small but the pressure is high, so it is called hydrostatic transmission. The quality of hydraulic oil will greatly affect the working reliability and service life of the hydraulic system. Usually the quality requirements for hydraulic oil are as follows: 1) Appropriate viscosity and good viscosity-temperature properties to ensure accurate and sensitive transmission of power under changes in operating temperature and to ensure normal lubrication of hydraulic components. 2) It has good rust resistance and anti-oxidation stability , is not easily oxidized and deteriorates under high temperature and high pressure conditions, and has a long service life. 3) It has good anti-foam properties, so that the foam generated by the oil will disappear easily under the working conditions of continuous mechanical stirring, so as to stabilize the power transmission and avoid accelerated oxidation of the hydraulic oil.   application   1.Industrial hydraulic system Hydraulic oils are suitable for use in various types of hydraulic systems in manufacturing and industry. 2. Mobile hydraulic transmission system Hydraulic oil is effectively used in mobile hydraulic equipment such as excavators and cranes. 3. Marine hydraulic system Suitable for ship hydraulic systems where ISO HM class hydraulic oil is recommended.