About reducing diameter of reducer

　　If the diameter specification of the reducer is inconsistent with the inner diameter of the process pipe, it shall be reduced or expanded accordingly. If the pipe is reduced, whether the pressure loss caused by this will affect the process flow shall be considered. In order to prevent the installation of reducer from affecting the distribution of velocity field and causing pressure loss, so as to reduce the measurement accuracy of electromagnetic flowmeter, the central cone angle shall not be greater than 15 °, the smaller the better. Because one side of the eccentric reducer is flat, which is conducive to exhaust or liquid discharge and convenient for start-up and maintenance, the liquid pipeline installed horizontally generally uses the eccentric reducer. The roundness of the reducer shall not be greater than 1% of the outer diameter of the corresponding end, and the allowable deviation shall be 3mm; The allowable deviation of reducer size shall comply with the regulations. There are concentric and eccentric, concentric reducer

　　Tube - generally used on vertical tubes; Eccentric reducers are used for horizontal pipes, and attention shall be paid to indicating whether the top is flat or the bottom is flat.

　　The orifices at both ends of the concentric reducer are centered on the same axis. When reducing, if the position of the pipe is calculated based on the axis, the position of the pipe remains unchanged. It is generally used for reducing the diameter of gas or vertical liquid pipes. The nozzle circumference at both ends of eccentric reducer is inscribed, which is generally used for horizontal liquid pipeline. When the tangent point of the pipe orifice of the eccentric reducer is upward, it is called top flat installation. It is generally used for the pump inlet to facilitate exhaust. When the tangent point is downward, it becomes bottom flat installation. It is generally used for the installation of the regulating valve and exhaust. Concentric reducers are conducive to fluid flow and have little interference with the fluid flow pattern when reducing. Therefore, concentric reducers are used for reducing the diameter of gas and vertically flowing liquid pipelines.