The fitting device of the regulating valve and the tuyere is installed by riveting method, and the order size A×B is the size of the matching tuyere, which is smaller than the size of the tuyere in actual manufacturing.

It is used to adjust the flow rate of the rectangular tuyere or diffuser and achieve the purpose of constant airflow. Its structure is split-type, and the adjustment knob can be rotated to adjust the opening and closing angle of all the blades synchronously, and the adjustment is convenient and stable.