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Flow control

Vortex Regulator Type WAB

Flow regulators have the task of restricting the pass forward flow during storm conditions and are used to regulate the flow from storm water retention tanks, sewers, retention tanks or overflow chambers to a preset value independent of the head, whilst allowing a constant flow.

Some retention basins do have strict requirements on the throttle accuracy for a fast emptying but require a complete open cross-section without moving parts for little blockage risk. Cyclone vortex regulators do have a big market acceptance because of these advantages and have a simple and robust construction.



A predefined regulation flow rate will be throttled by means of a vortex principle. The wet installed unit is mounted in front of an outlet opening of a storage system. The inlet of the vertical vortex regulator is tangential in flow direction. The outlet is in flow direction at the back of the unit. Because the outlet is located higher than the inlet, the inlet is normally submerged.

This leads to a permanent damming at the inlet. In a storm event the water level rises inside the vertical vortex body. As soon as the water level reached the peak the vortex flow starts. This vortex has a breaking effect without physically obstructing the flow opening and therefore guarantees a predefined maximum capacity.

The design variants

The Vortex Flow Regulator Type WAB-UCY is a wet installed flow regulator. Therefore, in contrast to semi-dry installations, there is no need of a separate throttle manhole needed. However, in order to be able to empty the manhole in the event of an accident, a separate emergency drain should be foreseen. The Vortex Flow Regulator consists of an inlet, a conical vortex chamber and an outlet, which can be fixed on a concrete wall or put into concrete in an opening.

The Vertical Vortex Regulator Type WAB-CE/V is a wet installed vertical flow regulator. The Vortex Flow Regulator consists of a vertical conical vortex body and is particularly suitable for the limitation of rainwater. This vortex body is placed on a plug-in board, which will be doweled on a wall. With a pull rod, the device can be pulled up to remove any blockages.

The advantages

  • Regulation without moving parts
  • Active fluid mechanical throttle

  • No wear parts
  • Operation without external power
  • Robust and simple stainless-steel construction
  • Easy installation
  • Different connection variants possible
  • Minimal maintenance