How it works
Heavy rain can overload sewer systems. A solution is to provide temporary storage basins, which release the collected rainwater in a controlled manner. The flow from is kept below the maximum flowrate which the sewer can handle. ESEP supplies valves which achieve this function without moving parts. The valves allow unrestricted flow up to a certain flowrate, but above this flowrate a vortex is formed and a further rise of the water level in the basin does not lead to a higher flowrate. The ESEP valves find application in other situations too, and they are supplied for a wide range of required flowrate and encountered water pressure.
Flexible valve design using Reves DSE
Reden has made a design tool for ESEP which is based on two-phase CFD modelling of the valve. The point at which the valve switches from stratified to swirling flow (thus limiting the flowrate) and the pressure/flow curve are automatically calculated by Reves DSE.
The design tool gives design solutions very quickly, despite the fact that it is based on a large number of time consuming CFD calculations. The tool is used by the valve designers at ESEP to select design parameters which lead to the performance desired by the customer. Using the tool allows for a more flexible product design and increases the performance prediction accuracy. It also gives reliable predictions for those flow ranges which are very difficult to measure in a real valve.
CFD calculations have supplied the raw data for the design tool, involving free surface turbulent flow. The pressure at the inlet is increased gradually, and a vortex is formed. A separate simulation is used to study the swirling only flow regime. A systematic study of the effects of the design parameters has been done using a DoE-approach. The results have been processed and implemented in the Reves DSE tool, which is demonstrated in the demo below.