Can the VAG ZETA® Knife Gate Valve be used for regulation purposes in wastewater?
Technically, this does not make sense because the control curve of standard Knife Gate Valves only has a noticeable effect on the flow rate when the valve is between 80 and 95 per cent closed. The valve can only be regulated in this narrow range. To increase the range toward 100 per cent, so-called restrictors have to be used. It is, however, imperative that the shape of the restrictors in the lower passageway does not prevent sediment being flushed.
