Chapter 2 Fundamental Hydraulic Fluid Mechanics 2.1.2 The requests and choice of hydraulic oil 1.Request The oil plays two roles of transmission energy and lubrication on the surfaces of working interaction The requests for the hydraulic fluids are:appropriate viscosity,the good in property of favorable viscosity-temperature,a good lubricity,chemically and environmentally stabilities,compatible with other system materials and so on 2.Choice The hydraulic oil in a hydraulic system at V4o=(10~60)×10°m/s recommended generally. The hydraulic oil should be chosen in according to the request of hydraulic pump The hydraulic oil viscosity adapted for different hydraulic pumps is listed in Tab.2-2. Homepage List Upwards Downwards Retumn ExitChapter 2 Fundamental Hydraulic Fluid Mechanics 9 2. Choice The hydraulic oil in a hydraulic system at is recommended generally. 1. Request The oil plays two roles of transmission energy and lubrication on the surfaces of working interaction. The requests for the hydraulic fluids are: appropriate viscosity, the good in property of favorable viscosity－temperature, a good lubricity, chemically and environmentally stabilities, compatible with other system materials and so on. 2.1.2 The requests and choice of hydraulic oil The hydraulic oil should be chosen in according to the request of hydraulic pump. The hydraulic oil viscosity adapted for different hydraulic pumps is listed in Tab. 2-2. 6 40  =  (10 60) 10 m/s