5 | Assembly/Installation
HYDAC FILTER SYSTEMS GMBH
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MoWa OLS10-Z-x 4573340 en-us web
– Kinematic viscosity
– Pipe dimensions
– Fluid density
The pressure loss can be estimated as follows for mineral oil-
based hydraulic oils:
Fig. 9:
Pressure loss formula
Δp Pressure differential
[bar]
L Line length
[m]
d Internal pipe diameter
[mm]
Q Flow
[l/min]
ν Kinematic viscosity
[mm²/s]
D Density
[kg/dm³]
The mineral oil-based hydraulic oil has a density of ≈ 0.9 kg/dm³.
This formula applies to straight pipe runs. Particularly with regard
to the suction side connection, note that additional connectors and
pipe bends increase the pressure differential.
Observe the following points for hydraulic connection:
– Keep the height difference of the product to the oil level in the
reservoir as small as possible.
– Use a suction hose that is suitable for a vacuum of ≥ -0.5 bar
(e.g. -1 bar).
– Avoid constrictions in the connected hoses. This reduces the
power and increases the risk of cavitation.
– Note that the nominal size of the connected hose/piping must
correspond to the cross-section of the connection thread.
– Ensure that the connecting lines (suction side/pressure side)
do not transfer any voltage or cause vibrations to the product.
Use hoses or compensators if necessary.
5.3.1 Connecting the suction port – INLET OIL
For the suction port connection, use a flexible hose that is resis-
tant to negative pressure. Avoid constrictions in the connecting
lines, as they compromise suction performance and increase the
risk of cavitation.
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