Hydraulic control oil lter
The lter is to be of the duplex full ow type with
manual change over and manual cleaning or of
the automatic self cleaning type.
A differential pressure gauge is tted onto the
lter
The following data is specied in Fig. 8.09.02:
• Filter capacity
• Maximum pressure drop across the lter
• Filter mesh size (absolute)
• Oil viscosity
• Design temperature.
Off-line hydraulic control oil ne lter or purier
Fig. 8.09.0
The off-line ne lter unit or purier must be able
to treat 5-20% of the total oil volume per hour.
The ne lter is an off-line lter and removes me-
tallic and non-metallic particles larger than 0,8
µm as well as water and oxidation. The lter has a
pertaining pump and is to be tted on the top of
the hydraulic control oil tank.
A suitable ne lter unit is:
Make: CJC, C.C. Jensen A/S, Svendborg,
Denmark - www.cjc.dk.
For oil volume <0,000 litres:
HDU 27/-MZ-Z with a pump ow of 5-20% of the
total oil volume per hour.
For oil volume >0,000 litres:
HDU 27/-GP-DZ with a pump ow of 5-20% of
the total oil volume per hour.
Temperature indicator
The temperature indicator is to be of the liquid
straight type.
Pressure indicator
The pressure indicator is to be of the dial type.
Level alarm
The hydraulic control oil tank has to have level
alarms for high and low oil level.
Piping
The pipes can be made of mild steel.
The design oil pressure is to be 0 bar.
The return pipes are to be placed vertical or laid
with a downwards inclination of minimum 5°.
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