1, butterfly butterfly plate installed on the diameter of the pipe direction. 2, butterfly plate in the installation, the butterfly plate to stop in the closed position. 3, open position should be according to the butterfly plate to determine the Angle of rotation. 4, the butterfly valve with a bypass Industrial Valves, open the bypass valve should be taken before opening. 5, shall be installed according to the installation of the butterfly valve manufacturer instructions and heavy weight of the butterfly valve, should set up a solid foundation.

matters needing attention in operation and maintenance of butterfly valve, butterfly valve opening and flow, the relationship between the basically linear scale change. If is used to control the flow, the flow characteristic and pipe flow resistance have close relationship, such as two install valve pipe diameter and form all the same, and the pipe loss coefficient is different, the flow valves will be a big difference. 

如果阀门处于节流幅度较大状态，阀板的背面容易发生气蚀，有损坏阀门的可能，一般均在15° External use. 

蝶阀处于中开度时，阀体与蝶板前端形成的开口形状以阀轴为中心，两侧形成完成不同的状态，一侧的蝶板前端顺流水方向而动，另一侧逆流水方向而动，因此，一侧阀体与阀板形成似喷嘴形开口，另一侧类似节流孔形开口，喷嘴侧比节流侧流速快的多，而节流侧阀门下面会产生负压，往往会出现橡胶密封件脱落。

butterfly valve, operating torque for the opening and the direction of valve opening and closing its different values, different horizontal butterfly valves, especially large diameter valve, due to water depth, valve shaft, the water head difference generated by the torque also nots allow to ignore. In addition, the valve inlet side bend, form the bias current, torque will be increased. Due to water flow of the opening of the valve is in the middle moment, operators need to be self-locked.

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