附件24.2 Tab.2-2 The range of viscosity of hydraulic oil adapted to pumps viscosities(106m2/s) Viscosities(106m2/s) Types 540℃ Types 40℃400 P<7MPa 30-50 40-75 Gear 30-7095-165 pumps Vane Radial P≥7P: 50-70 50-90 piston 30-50 65-240 pumps Axial Screw pumps 30-50 40-80 3070 70-150 List 2.2 Hydrostatics(液体静力学) Chapter2 Fundamental Hydraulic Fhuid Mechanics 2.2.1 Characteristics of Hydrostatics 1.The hydrostatics Static pressure:the action force in normal on a unit area.It is ntituled pressure in physics and action force in engineering usually 2.The characteristics of hydrostatics (1)In any homogeneous fluid system at rest,the pressure creases with the depth of the fluid. (2)Pressure at any point in a homogeneous fluid system at rest acts perpendicularly to surfaces in contact with the fluid. 12 Hmpee List Upeards Dorsvcards Retum Eit 附件 24.2 2.2 Hydrostatics （液体静力学） 12