The volume percentage of air contained in the Hydraulic Press medium is called air content. The air in the hydraulic medium is mixed with air and dissolved air. Generally, 8% – 10% air is dissolved in oil. The dissolved air is evenly dissolved in the hydraulic press medium, which has no effect on the bulk elastic modulus and viscosity, while the mixed air is suspended in the hydraulic medium in a bubble state with a diameter of 0.25-0.5mm, which has a significant effect on the bulk elastic modulus and viscosity. In addition, if the air content is too high, there is a risk of gasoline tussah and “diesel engine effect”. The above phenomena will lead to material deterioration.
Under atmospheric pressure of hydraulic press, air dissolves in hydraulic oil. At low pressure. For example, when it is lower than the air separation pressure of the working liquid, these air will be released. Generally, the air separation pressure of the hydraulic medium is 1300-6700pa. In addition, when the pressure of the working liquid is lower than a certain value, the medium of the hydraulic press will boil and produce a large amount of steam. This pressure is called the saturated steam pressure of the medium at this temperature. The saturated steam pressure of mineral oil hydraulic oil is 6-2000pa at 20 ℃, the saturated steam pressure of emulsion is similar to that of water, and the hydraulic oil of hydraulic press is 2400pa at 20 ℃.
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