Eight, H group (hydraulic system) oil 1.H group oil classification criteria (GB/T7631.2-87) China has developed a classification of H group oil, it is divided into hydrostatic pressure and fluid hydraulic transmission The system uses two parts of the working medium. The former is used to transfer potential energy, often called hydraulic oil (for mineral oil or synthetic hydrocarbon oil) and hydraulic fluid (for flame retardant synthetic oil). The latter is used for transfer functions, often referred to as hydraulic or hydraulic transmission oil. Work on hydrostatic systems
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