Page 30 - trends in automation
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corrosion resistance also means it can be
used without any problems out in the
open without being affected by the salty
air of the Cape Whale Coast. 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 mechanism,
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,
standardised interface between the
controller (PLC) and the valve terminal.
The system concept 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
provide 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
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.
is
infoservice
23-03
Partner for automation –
water technology
“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.
