| 摘要 |
The injection device has a fluid-tight housing connected to an air pipe and a pipe body (8) having a diaphragm (9) for adjusting the flow of water by the rotation of an injection pipe (13). This pipe co-operates with a rotary bushel (6) perforated (11) disposed co-axially to the pipe. The bushel can open holes (16,18) in the wall of the body of the pipe and in the pipe. This makes the housing into a depression chamber, varying the flow of water (F) going through the pipe.
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