• MID Abflusssteuerung TYP SDS
Flow control

MID Flow Control Type SDS

Modern management of the sewer system includes reliable throttling devices which, in rainy weather, provide a safe and constant throttling of discharge quantities to protect the downstream equipment. This ensures that the connected wastewater treatment plant is fed with constant quantities and is not hydraulically overloaded.

The MID Flow Control Type SDS was developed for high demands on throttle accuracy.

For continuous, Blockage-free throttling of the discharge volume

Functionality

The discharge from the restraint system is measured with a magnetic-inductive flow meter (MID) for partially and fully filled pipes, so that dry weather runoff and rainy weather runoff can be registered. In dry weather, the control slide is fully open, so that an unimpeded flow through the controlled system is guaranteed. If the discharge volume in rainy weather exceeds the preset setpoint, the control is activated.

The electric control drive is activated and closes the control slide until the slide plate position belonging to the current flow rate has been reached. The electronic controller constantly compares the measured flow rate with the setpoint. By changing the slide plate position upwards or downwards, the throttle cross section behind the measuring section is always adjusted to such an extent that the set throttle discharge quantity is exactly maintained. The control process continues until the backflow in the retention area has been removed and the flow rate is below the setpoint. If this is the case, the control slide opens automatically and creates a full discharge cross-section.

If a blockage occurs during the control process, this inevitably reduces the flow rate. This in turn leads to an automatic raising of the slide plate – if necessary – until the control slide is fully opened.

After the throttle cross-section is flushed out and the flow rate increases spontaneously, the control slide moves back into its control position. In the case of a backflow, the flow rate drops due to the counter pressure. The flow meter records the decreasing discharge volume and opens the control slide until the set target discharge has been reached again.

The advantages

  • High measuring accuracy even with small partial filling
  • Vertical Q / H characteristic
  • Regulation also with backflow
  • Stepless adjustment of the target discharge quantity
  • Active throttle device according to DWA A111
  • Selbsttätige Regeneration bei Drosselverstopfung
  • Optionally with telecontrol connection
  • Automatic regeneration in case of blockage

Design outflow

Unit DNDrainage capacity Qmin l / sDrainage capacity Qmax l / s
150
8

26

200
10

48

250
20

82

300
35

128

350
60

185

400
80

256

500
140

440

600
300

680

700
450

990

800
650

1370

900
890

1830

1000
1170

2400