At present, the general in the world is more than 12 mm butterfly valve has gradually replaced the gate valve. Compared with the butterfly Industrial Valves and gate valve opening and closing time is short, the operation for the moment is small, small installation space and light weight. About 2 t DN1000, for example, butterfly valves, gate valves and about 3. 5 t, and butterfly valves easily combined with various drive, good durability and reliability. 

橡胶密封蝶阀缺点是作节流使用时，由于使用不当会产生气蚀，使橡胶座剥落、损伤等情况发生。 For this, now again on international development metal sealing butterfly valve, reduce cavitation area, in recent years, our country is also developing the metal sealing butterfly Industrial Valves, in Japan in recent years also developed cavitation resistance, low vibration, low noise comb tooth shape of butterfly valve. 

一般密封座的寿命在正常情况下，橡胶15年- For 20 years, 80 - metal In 90. But how to correctly choose should according to the working condition requirements.

butterfly Industrial Valves opening and the flow rate, 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。 

蝶阀操作力矩，因开度及阀门启闭方向不同其值各异，卧式蝶阀，特别是大口径阀，由于水深，阀轴上、下水头差所产生的力矩也不容忽视。 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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