OLF 10/2
Installing the OLF
HYDAC Filter Systems GmbH
en
Page 18 / 32
BeWa OLF10-2-TV 3494386 en 2009-09-16.doc
2009-09-16
Notes on the hydraulic connection
Use as few threaded connections as possible in order to keep the pressure loss as low
as possible.
The pressure loss in a hydraulic line depends upon:
•
Flow rate
•
kinematic viscosity
•
pipe dimensions
•
fluid density
The pressure differential can be estimated for hydraulic oils as follows:
Δ
p
≈
6.8 * L / d
4
* Q * V * D
Δ
p = Pressure differential in [bar]
L
= pipe length [m]
d
= internal pipe diameter [mm]
Q
= Flow rate [l/min]
V
= kinematics viscosity [mm²/s]
D
= Density [kg/dm³]
Mineral oil based hydraulic fluid has a density of
≈
0.9 kg/dm³.
This applies to straight pipe runs and hydraulic oils. Additional threaded connections
and pipe bends increase the pressure differential.
Keep the height difference between the pump and the oil level in the tank as minimal
as possible.
Hoses must be suitable for suction pressures of at least -0.5 bar.
Constrictions in the connections and lines should be avoided. This could compromise
suction output and cause cavitation.
Take note that the nominal size of the connected hoses/piping must be at least as large
as the inlet port sizes.
Make sure that no tension or vibrations are carried over to the pump or filter housing
when the pipes are connected. Use hoses or expansion joints if necessary.
Summary of Contents for OLF-10/2
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