The sturdy quarter turn actuator DAPS
controls ball valves and butterfly valves
with various media flows and an angle of
rotation that is limited to 90°. The torque
is generated via a scotch yoke mecha-
nism, which helps to overcome the valve’s
high breakaway torques.
Systematic automation
The decentralised valve terminal is the
core of pneumatic systems in water
technology. Located in the vicinity of the
process valves, it is ideal for fast and
simple automation solutions featuring
the optimum interaction of process
valves, pneumatic components and
electronic components. The valve
terminals have a modular configuration
based on the number of process valves,
while the fieldbus provides the system
with a single, clearly defined, standard-
ised interface between the controller (PLC)
and the valve terminal. The system con-
cept has the advantage that extensions
or modifications can simply be made at
control level, without having to replace
the hardware. And, last but not least, all
the components are perfectly matched.
Sturdy pneumatic components
The butterfly valves are controlled by
valve terminals MPA. These also pro-
vide information about the filter’s
current status by determining its fill
level, differential pressure and flow
rate. If a filter needs to be rinsed, the
PLC controls the valve terminal, and
“
Pneumatic automation technology reduces
investment, installation and operating costs
in comparison with electrical installation by
more than 50% in some cases.”
Coen Pretorius, sales engineer at Festo Cape Town
Reliably evacuates sludge deposits:
The linear
actuator Copac, or DLP for short, can be used
without any problems in the salty air thanks to
its high corrosion resistance.
Closes and opens the sand bed filters:
The
sturdy quarter turn actuator DAPS controls ball
valves and butterfly valves.
thus the order in which the butterfly
valves are actuated, in step with the
rinsing programme. After the rinsing
programme has been completed,
normal filter operation is resumed. The
valve terminal is configured based on
the number of pneumatic drives, limit
switches and measuring instruments.
The Preekstoel water treatment plant,
built in 1974, currently treats 10 million
litres of drinking water each day. The
upgraded plant will have a capacity of
28
million litres of drinking water per
day. The groundwater pumped into the
plant will be treated by a biological filter
system. This is all part of the Overstrand
Municipality water authority’s plan to
guarantee the water supply for the Cape
Whale Coast for the coming years.
www.festo.com/catalog/daps
www.festo.com/catalog/dlp
www.festo.com/water