Anti-wear hydraulic oil (HM) is mainly used in hydraulic systems for heavy-duty, medium-pressure, high-pressure vane pumps, plunger pumps and gear pumps. It is used for hydraulic systems of medium-voltage and high-pressure engineering machinery, imported equipment and vehicles, such as hydraulic systems such as CNC machine tools, tunnel boring machines, crawler cranes, coal shearers, etc. Today we take a look at the difference in performance between 46# anti-wear hydraulic oil and 68# anti-wear hydraulic oil: 1) Kinematic viscosity is different At 40°C in the laboratory, the kinematic viscosities of the two types of hydraulic oil are different. The viscosity of No. 46 anti-wear hydraulic oil is 46±5, and the viscosity of No. 68 anti-wear hydraulic oil is 68±5. It is very popular that the viscosity of No. 46 anti-wear hydraulic oil is thinner than that of No. 68 anti-wear hydraulic oil. If it is winter, the viscosity will be thinner to facilitate circulation; in summer, the temperature is high, and the viscosity is higher. 2) Different pour point In actual use, there is still a big difference between the pour point of No. 46 anti-wear hydraulic oil and No. 68 anti-wear hydraulic oil. For example, in the central region, the temperature in winter is around 0℃ for a long time. If you use No. 68 in summer Anti-wear hydraulic oil, cold start performance of your equipment may be worse in winter, and serious hydraulic equipment cannot operate normally. 3) Different air release values The air release value of No. 46 anti-wear hydraulic oil is no more than 10 min; the air release value of No. 68 anti-wear hydraulic oil is no more than 13 min. In the standard experiment, the time required for bubbling to rise to the oil surface is called the air release value of the lubricating oil. The smaller the air release value, the faster the bubble can rise, and the better the air release.
How to choose 46# and 68# anti-wear hydraulic oil? Regarding the question of how to choose No. 46 and No. 68 anti-wear hydraulic oil, in fact, it depends on the working conditions of your equipment to see which is more suitable. Hydraulic oil is divided into 22, 32, 46, 68 grades according to the kinematic viscosity at 40°C. 46 and 68 are just two grades of different viscosity grades in anti-wear hydraulic oils, which have a higher viscosity than HM 46 and HM 68. Which viscosity level the customer chooses depends mainly on the operating temperature of the system and the type of pump used. The customer must refer to the recommended level requirements of the equipment manual. It is important to select the appropriate viscosity. If the hydraulic oil viscosity is too large, the hydraulic system will lose energy, the system efficiency will be low, and the oil pump will be difficult to suck; if the viscosity is too small, the oil pump will leak large and the volume loss will increase, which will also reduce the system efficiency.
