Page 53 - Highlights 2013
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The DFPI is perfect for this application: the
speed of this pneumatic actuator can be
individually adjusted for opening and closing
motion by means of exhaust air flow control
valves. Slow travel to any intermediate
positions is possible during opening, and the
closing motion can be executed very quickly.
This saves rinsing water and time.
Created for harsh environments
Actuators with external control attachments
cause big problems in harsh environments,
for example due to corrosion and dust
deposits. Therefore, the actuators of the DFPI
series from Festo have the system
components required for control integrated
all in one place. The cylinder, the displace-
ment encoder, the valve manifold, the
positioner and (new) the analogue feedback
signal are enclosed in a single housing in the
DFPI. So the DFPI can withstand the toughest
conditions.
Regulating sludge discharge with weir gates
at fixed-bed filters
Fixed-bed filters are an important part of
water treatment in water and wastewater
treatment plants, usually requiring five to
eight process valves for control. In the case
of an open design and a large basin, gate
valves without housing or weir gates are
frequently specified for the inlet and for
sludge discharge.
Weir gates – more precisely overflow weir
gates – offer process advantages for
controlling sludge discharge during
backwashing. Because they can be opened
step by step, there is no suction effect on
the filter bed. This means that the discharge
of filter particles is reliably avoided. Closing
at the end of the backwashing process is
performed quickly and in a single step in
order to keep idle time as short as possible.
Step-by-step opening, closing in one motion: the controlled pneumatic actuator DFPI reliably prevents the discharge of filter particles and also saves
rinsing water and time.
Pneumatic actuator DFPI controls
complex media flows reliably
Regulating the complex media flows in the process industry not only requires intelligent
control, but above all reliable positioning actuators like the DFPI. This is why the DFPI is used
in water and wastewater treatment plants as well as in ore processing, bulk-goods systems,
and the control of ventilation flaps.
The DFPI: one of many compo-
nents for water technology.
Festo offers complete automa-
tion solutions for several
industry segments.
Learn how you can save time
and money in water treatment:
