DD - DDP - PD - QD - FILTERS
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2.1 DD filters
The DD filter is a general purpose protection and liquid
removal filter. The filter element retains water and oil particles,
which can be removed by the drain.
The air flow is from inside to outside the filter element.
The DD9 up to DD32 filters are provided with a differential
pressure indicator which turns red as the pressure drop over the
filter increases. The DD44 up to DD520 filters are provided with a
gauge indicating the pressure drop over the filter. A voltage-free
switch can be ordered as option which closes at a pressure drop
of 0.35 bar and which can be used for remote control or alarm
purposes.
2.2 DDp filter
The DDp filter is a dust filter. The filter element traps the solid
particles.
The air flow is from outside to inside the filter element.
The DDp9 up to DDp32 filters are provided with a differential
pressure indicator which turns red as the pressure drop over the
filter increases. The DDp44 up to DDp520 filters are provided with
a gauge indicating the pressure drop over the filter. A voltage-free
switch can be ordered as option which closes at a pressure drop
of 0.35 bar and which can be used for remote control or alarm
purposes.
2.3 PD filter
The PD filter is the same as the DD filter but is more efficient. It is
a high efficiency dust, liquid and aerosol removal filter for
compressed air. The filter element traps the solid particles. The
oil/water aerosols liquefy and the so-formed drops collect and are
removed by the drain.
The air flow is from inside to outside the filter element.
The PD9 up to PD32 filters are provided with a differential
pressure indicator which turns red as the pressure drop over the
filter increases. The PD44 up to PD520 filters are provided with a
gauge indicating the pressure drop over the filter. A voltage-free
switch can be ordered as option which closes at a pressure drop
of 0.35 bar and which can be used for remote control or alarm
purposes.
2.4 QD filter
The QD filter is an oil vapour and odour removal filter. The air
flows through the activated carbon which is contained in the QD
filter element and which absorbs oil vapours and odours.
The air flow is from inside to outside the filter element.
3.1 General remarks
When installing the filter, keep in mind the following:
– Be sure that the pipework is internally clean, especially
downstream of the filter.
– The filters must be mounted vertically.
– If the unit is integrated in a multiple line system, provide
isolating valves and, if required, a by-pass.
– The automatic drain has a special connection allowing easy
installation of a flexible or a quick coupling to pipe away the
drained liquid. Take care not to create a flow resistance.
3.2 Specific remarks
3.2.1 DD filter
No specific remarks for the installation of the DD filter.
3.2.2 DDp filter
When the DDp filter is used with an adsorption type air dryer,
install the filter downstream of the dryer.
3.2.3 PD filter
The filter must be mounted as close as possible to the point of use
of the air.
It is recommended to install a DD filter upstream the PD filter. If
not, the load on the PD filter element may become too high and
will reduce its lifetime.
3.2.4 QD filter
To protect the active carbon element, the QD filter must always be
preceded by a PD filter.
The filter should be mounted as close as possible to the point of
use of the air.
2. DESCRIPTION
This filter does not remove methane, carbone
monoxide, carbon dioxide or other toxic gases and
fumes.
3. INSTALLATION
Vendor Manual Atlas Copco A090-070423-004 PD & DD Filters Instruction Manual
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