In 1987 Dr Mike Green of WrC carried out flow to head to orifice
testing of one of our vortex controls compared to other control types.

Test Results

By rearranging the general flow formula

The Coefficient of discharge reveals the flow to head to orifice area efficiency of the controls.

Our control was shown to be the most efficient of the 3 tested

These pictures show one of our larger controls on test by Professor David Balmforth at Sheffield Halam University

The Construction Products Regulations 2021 require manufacturers to supply a Declaration of Performance for any construction product and a copy of our DOP can be downloaded here

DOWNLOAD DOP - PDF