DD - DDP - PD - QD - FILTERS
6 2904 0108 04
When maintaining the filter, keep in mind the following:
– On filters with automatic drain valve, check the sight glass at
regular intervals. A liquid level indicates malfunction of the
automatic drain valve. Replace the latter if cleaning does not
correct the trouble.
– On filters with manual drain valve, open the latter at regular
intervals to evacuate collected dust or liquid.
– For DD, PD and DDp filters, change the filter element yearly
or when the pressure drop reaches approx. 0.35 bar.
– In case an automatic drain valve is installed, manual draining
can be carried out by turning the connection nipple of the
automatic drain valve counterclockwise.
– For QD filters, the change interval of the adsorption element
is approx. 1,000 operating hours or yearly. Its pressure drop
will not increase during its useful life. Nevertheless, the
adsorption element must be changed earlier at the first signs
of oil vapour and odour.
Refer to Fig. 2. The on the figure indicates the items provided
in a new filter kit.
1. Isolate the filter from the air net.
2. Depressurize the filter by turning the connection nipple of the
automatic drain valve counterclockwise or by opening the
manual drain valve.
3. Unscrew the bowl. A whistling noise will warn you if the bowl
is not fully depressurized. If this occurs, the bowl should be
screwed back and the venting should be repeated.
4. Discard the filter element.
5. Remove the drain valve by unscrewing the retaining nut
underneath the bowl.
6. Remove the O-ring from the bowl and clean the bowl.
Position a new O-ring on the bowl.
7. Remove the O-ring from the drain valve and position a new
O-ring on the drain valve. The latter is supplied with each
new filter kit.
8. Reinstall the drain valve in the bowl using the retaining nut.
9. Reposition the new filter element with the 2 new O-rings.
10. Screw the bowl completely on the head.
6.1 Reference conditions
Air inlet pressure.......................................................................................7 bar(e)
Air inlet temperature ......................................................................... 20 °C (68 F)
Ambient temperature ........................................................................ 20 °C (68 F)
6.2 Principle data
Maximum compressed air inlet pressure..................................... 16 bar (232 psi)
Minimum compressed air inlet pressure..........................................1 bar (15 psi)
Minimum compressed air inlet temperature........................................ 1 °C (34 F)
Maximum compressed air inlet temperature....................... 65 °C (35 °C for QD)
Minimum ambient temperature........................................................... 1 °C (34 F)
Maximum ambient temperature.......................................... 65 °C (35 °C for QD)
Maximum recommended pressure drop.......................................0,35 bar (5 psi)
(not for QD)
6.3 Specific data
6.3.1 DDp filter
Filter efficiency down to 0,3 µm................................................................. 99,9 %
6.3.2 DD filter
Maximum oil carry over at 20°C (68 F) and 7 bar(e)............................ 0,1 mg/m³
Filter efficiency down to 0,3 µm................................................................. 99,9 %
6.3.3 PD filter
Maximum oil carry over at 20°C (68 F) and 7 bar(e).......................... 0,01 mg/m³
Filter efficiency down to 0,3 µm........................................................... 99,9999 %
6.3.4 QD filter
Maximum compressed air inlet temperature..................................... 35 °C (95 F)
for normal service life
Maximum oil carry over at 20°C (68 F) and 7 bar(e)........................ 0,003 mg/m³
4. MAINTENANCE
When the filter has to process air with a temperature
higher than the maximum temperature, the filter’s
lifetime will reduce considerably.
5. FILTER ELEMENT CHANGE
A small amount of acid-free vaseline may be applied
to screw threads and O-rings to facilitate the
assembly.
6. TECHNICAL SPECIFICATIONS
Vendor Manual Atlas Copco A090-070423-004 PD & DD Filters Instruction Manual
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