2.3 Water separator and filters
Overview
Water separator with drain (WSD) (1)
WSD’s are general purpose water separators for removal of free water from compressed air.
Centrifugal force created in the cyclone throws free water (droplets) to the wall, from where it flows
down to the bottom of the bowl. The water is automatically discharged when a given level is
reached. A drain valve is provided for manual draining of the bowl.
UD+ filter (2)
The UD+ filter combines two filtration steps into one, removing oil aerosols to 0.01 mg/m
3
(0.01
ppm) and particles down to 0.01 micron. The filter is equipped with a drain. Typical pressure drop
over filter is 0.08 bar (1.16 psi) when dry and 0.2 bar (2.9 psi) when saturated.
The air flow is from inside to outside the filter element.
PDp+ filter (7)
The PDp+ is a high efficiency particle filter for dust protection, removing particles down to 0.01
micron. Pressure drop over filter is 0.08 bar (1.16 psi) when dry.
The air flow is from outside to inside the filter element.
The UD+ and PDp+ filters are equipped with a differential pressure gauge, indicating the
pressure drop over the filter.
An electronic water drain (EWD) on the water separator, on the UD+ filter can be
provided as option (see section Optional equipment).
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