Non-return valves


Reasons to install backflow prevention protection.

The causes of backflow
Back flow from the public sewer system is mainly caused by:

  • overall under-sizing of the public sewers
  • high peak flows in stormwater sewers or combined sewers due to short but intense rainfall (climatic trend throughout the world)
  • increase of surface water runoff due to new construction (growing territorial urbanization), causing greater volume of flow
  • overflow due to peaks of simultaneous flow in built up areas
  • malfunctions or blockages downstream from the grid.