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14
Viscosity Characteristics
Selection from Viscosity Characteristic Graph
Required specifications example:
Find the pilot air pressure and pilot air consumption for a discharge rate of 12 L/min, and a viscosity
of 100 mPa·s.
Selection procedures:
1. First find the ratio of the discharge rate for fresh water when viscosity is 100 mPa·s from the
graph above. It is determined to be 68%.
2. Next, in the required specification example, the viscosity is 100 mPa·s and the discharge rate is
12 L/min. Since this is equivalent to 68% of the discharge rate for fresh water, 12 L/min ÷ 0.68
=17.6 L/min, indicating that a discharge rate of 17.6 L/min is required for fresh water.
3. Finally, find the pilot air pressure and pilot air consumption based on selection from the flow
characteristic graphs.
Caution
Viscosities up to 5000 mPa·s can be used.
Viscosity and dynamic viscosity are obtained by the formulas below.
Dynamic viscosity ν [m
2
/s]
=
Viscosity μ [Pa
・
s]
Density ρ [kg/m
3
]
Viscosity and dynamic viscosity are obtained by the formulas below.
Dynamic viscosity ν [cSt]
=
Viscosity μ [mPa
・
s]
Density ρ [g/cm
3
]
1 [mPa
・
s
]=
1 [cP]