The original overflow jet dyeing machine is equipped with Ⅰ, Ⅱ, Ⅲ, three return water valves, which are generally installed at the left rear of the machine. They are mainly used to control and adjust the running of the fabric and the distribution in the machine. Practice has proved that valve I should be opened relatively larger, while valves II and III, especially the last valve III, should be opened smaller. Valve II is generally after the dyeing machine is debugged normally, even if there is little change to the processed products, Then it can be fixed, in short, the dye liquor in the machine should be fully inclined to the overflow trend, which is the characteristic of the overflow jet dyeing machine. On the contrary, if the valve III is opened larger, especially for light and thin fabrics, the fabric will lag, which will not only affect the smooth flow of the fabric, even cause turbulence, and cause knots and blockage of the fabric; it will also increase the impact of the nozzle on the fabric. Increase the tension, resulting in air blowing between the cloth guide roller and the nozzle, which is prone to cracks on light and thin fabrics, and scratches on the surface of heavy fabrics, resulting in excessive local tension and uneven shrinkage of the fabric. The mechanical defects can usually be solved by the adjustment of the return valve.
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