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一、前言寒冷地区使用的工程机械,其液压系统应采用低温液压油。一般地说,低温液压油是根据不同的环境条件和不同的液压系统,其倾点(PP)、粘度指数(VI)和低温粘度(Vt)有所不同。通常,VI300、PP<-60℃属极低温专用油,VI250、PP<-45℃属寒区用油;VI150、PP<-35℃属环境温度不太低(-20℃左右)及冬季通用油。低温液压油的主要性能是低温启动性和低温泵送性。各国都根据不同的使用条件,研制出能够满足工程机械需要的不同牌
First, the foreword Construction machinery used in cold areas, the hydraulic system should be low temperature hydraulic oil. Generally speaking, low temperature hydraulic oil is different according to different environmental conditions and different hydraulic system, its pour point (PP), viscosity index (VI) and low temperature viscosity (Vt) is different. Usually, VI300, PP <-60 ℃ is a very low temperature special oil, VI250, PP <-45 ℃ is a cold area oil; VI150, PP <-35 ℃ is the ambient temperature is not too low (-20 ℃) oil. The main properties of cryogenic hydraulic oil is low-temperature start-up and low temperature pumpability. All countries according to different conditions of use, developed to meet the needs of construction machinery, different brands