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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.
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.
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.
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 displacement 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.
The DFPI: one of many components for water technology. Festo offers complete automation solutions for several industry segments. Learn how you can save time and money in water treatment: www.festo.com/water