Hydraulic oil is an important part of the pneumatic-hydraulic type driving device of the main steam isolation valve, whose physical property effects on the electromechanical equipment performances were never studied. This paper reports the research on the physical property effects. The effects of the environment on hydraulic oil physical properties are discussed and the plant environment are introduced. Based on the mechanic-electric-hydraulic co-simulation model of the equipment, the motion performance indexes of the driving devices are illustrated and the cycle simulation methodology is proposed. The influencing laws of hydraulic oil properties on the motion performance indexes are revealed and illustrated. The results show that hydraulic oil properties have important effects on the motion performances of the equipment. The results provide important references for designing the equipment and experimental verification, which make the equipment more reliable.

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