Hydraulic oil is divided into general hydraulic oil, anti-wear hydraulic oil, guide hydraulic oil, low temperature hydraulic oil and so on according to the different additive composition added in the base oil. If the system pressure of the hydraulic press is less than 7Mpa, HL general hydraulic oil can be generally selected. If the hydraulic press uses the plunger pump or blade pump as the power source, and the pressure of the system is medium, high pressure and heavy load, the hydraulic oil selected in the system should be HM anti-wear hydraulic oil, so as to ensure the normal work of the fine parts in the nutrition system. If the ambient temperature is below zero, HS type low temperature hydraulic oil should be selected. HV type low temperature hydraulic oil is used in lower environmental conditions than HS type low temperature hydraulic oil.
Even if it is the same type of hydraulic oil, the steel and wood door embossing machine should choose hydraulic oil with different viscosity at different ambient temperatures. Dynamic viscosity is an index that reflects the flow of hydraulic oil. Dynamic viscosity: It is the force required to produce a unit flow rate using a unit area of liquid layer per unit distance. Unit :pa.s (pa/s). Kinemical viscosity: that is, the ratio of dynamic viscosity to density, the customary unit is: centis. The lower the dynamic viscosity, the better the low temperature fluidity. L-HM32, L-HM46, L-HM68 these three kinds of anti-wear hydraulic oil are more commonly used models.
