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Impact of Fresh and Sheared Oil Viscosity Requirements on the Formulation of Hydraulic Fluids

机译:新鲜和剪切油粘度要求对液压油配方的影响

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This analysis showed that only a subset of the oils meeting the NFPA and MEHF guidelines span three viscosity grades. This wide level of cross-grading is the most desirable for providing high efficiency benefits at both low and high temperatures. An optimum definition of a high efficiency hydraulic fluid may thus be obtained by specifying, for a given ISO viscosity grade, that the fluid:rn1. Falls in the next lower L grade as per ASTM D 6080rn2. Falls in the next higher NFPA viscosity gradern3. Has a viscosity index after sonic shear higher than 160rnIn the case of an ISO VG 46, this corresponds to an L32-68 with a VI after sonic shear of 160 or greater.
机译:该分析表明,只有一部分符合NFPA和MEHF准则的机油跨越了三种粘度等级。为了在低温和高温下都提供高效率的好处,最需要这种广泛的交叉分级。因此,对于给定的ISO粘度等级,可以通过指定流体rn1来获得高效液压油的最佳定义。符合ASTM D 6080rn2的下一个较低的L级。降到下一个更高的NFPA粘度等级rn3。声波剪切后的粘度指数高于160rn在ISO VG 46的情况下,它对应于声波剪切后的VI为160或更大的L32-68。

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