Explanation of adjustable shrinkage cavity

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I. Working principle of the dual-core adjustable orifice The dual-core adjustable orifice is a new type of control valve designed as an improvement on the original single-core adjustable orifice; it is used to regulate the flow rate of the air-powder mixture in the powder delivery pipeline. By means of the rotational torque applied to the handwheel, this torque is transmitted up and down through a drive rod, thereby generating upward and downward forces that cause the upper and lower valve plates to move in opposite directions, thus enabling regulation of the cross-sectional area through which fluid flows in the pipeline. II. Performance features of the dual-core adjustable shrinkage hole: 1. The dual-core plate and the wear-resistant channel cylinder are made of rare-earth wear-resistant steel, offering excellent wear resistance, good sealing performance, flexible operation, good adjustability, precise manufacturing, and an attractive appearance. 2. The air-powder mixture within the pipeline remains at the center of the pipe. Since the dual-core plate with adjustable constricting holes moves back and forth from the center of the pipe, this eliminates the problem of eccentric flow, reduces flow resistance and wear on the pipe walls, thereby extending the service life of the powder transport pipeline. 3. The dual-core adjustable neck design features a sealing mechanism, which prevents coal powder from entering the neck area; as a result, it remains capable of flexible operation throughout its lifespan, offering a long service life. 4. It has a compact structure, requiring little installation space. 5. Low operating torque, flexible switching, with no sticking. For double-core adjustable shrinkage holes with an inner diameter of DN300–DN600, the relevant materials and manufacturing processes can be tailored to suit the requirements of the specific installation site.