It may be used for designing limiting flow orifices in hydraulic systems. Should you have any doubts for what grade of the hydraulic oil you need to choose. Hydraulic Oil Flow through Orifices The chart shows approximate pressure drops which may be expected at various flows rates through sharp edge orifices for petroleum type hydraulic oil. Synthetics typically have a higher VI than conventional oils. The higher the VI, the less the viscosity changes with temperature changes and the better the oil protects the engine. It is 3 main things to choosing the right hydraulic oil It is measured by comparing the viscosity of the oil at 40☌ (104☏) with its viscosity at 100☌ (212☏). Special conditions are treated specially. Hydraulic Oils at common Viscosity Grades: ISO VG 32 85 at 20☌, 32 at 40☌ and 15 at 60☌ ISO VG 46 140 at 20☌, 46 at 40☌ and 20 at 60☌ ISO VG 68 210 at 20☌, 68 at 40☌ and 30 at 60☌ To learn more about how hydraulic oil works and the requirements you should keep in mind, get in touch here. Generally speaking, if the temperature is low in winter, use #32 & #46 hydraulic oil with a lower viscosity, and use #68 hydraulic oil with a higher viscosity in summer. The difference is: the viscosity is different. Due to different application scenarios, the required hydraulic oil viscosity is also different, which also have many different types of hydraulic oil, different grade and the common ones are #32 hydraulic oil #46 and #68 hydraulic oil. 68 have their own advantages and different viscosities.
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