A venturi jet unit assembled from a series of parts

摘要

The venturi jet for entraining air in a stream of water comprises a T junction 1 having a water inlet 2, an air inlet 5 and an aerated water outlet 6. Fitted within the water inlet 1 is a first reducing bush or socket 8 in which a second reducing socket 9 and a cylindrical jet 10 are secured. By passing water through the first and second reducing sockets which have a diminishing cross section its velocity is increased so that the stream issuing from the jet 10 can draw in air from inlet 5. The aerated water passes through a bush 14 and reducing socket 15 fitted in outlet 6 into a pipe 7 from where it can be directed by a pipe 16 into the bottom of a sewage treatment tank. The embodiment of Figure 2 shows a that a plurality of venturi jet units may be provided in a single assembly so that, for example, aerated water could be supplied to two treatment tanks.