Swirl chamber with movable non-return valve and air injector for prevention of sedimentation in strom water and waste drains

A device which is retrofitted or prefabricated for a draining-well, provided with one or several inlets (2) and one or several pumps (23), connected to an outlet pipe (33) for waste and storm water (6), which prevents sedimentation and blockage, and which maintains the proportions between outgoing waste water and storm water (6) within set limits, comprising:

• a swirl chamber (1) with air injector (3), designed such that the swirl chamber reduces the damming height above an overflow edge (4) of the flow of waste and storm water (6), and that at the same time the swirl chamber prevents floating objects and surface sludge from flowing over the overflow edge (4), using a sludge shield (19), and that the device has a movable barrier (15) which prevents reverse flow from the recipient watercourse, when its level is higher than normal, from entering outlet pipe (34) and coming back up through outlet pipe (2) and on into the connected waste water and storm water system and that the outgoing water flow speed through outlet pipe (7) is increased by installation of a swirl separator (25) which forms vortices, which means that the water flow rate increases such that the water retains sludge particles and that the particles are flushed out through outlet (33) together with the outgoing water.