Small butterfly pneumatic valve in the process of using knowledge of 36

s, the United States invented the pneumatic valve, butterfly s introduced to Japan, to s widely used in Japan, and popularized in our country is s. The world in general DN millimeter above pneumatic valve has gradually replaced the brake pneumatic butterfly valve. Compared with the control pneumatic pneumatic valve and gate valve opening and closing time is short, the operation for the moment is small, small installation space and light weight. DN, for example, about T butterfly pneumatic valve, pneumatic valve about brake. T, and the adjustment of pneumatic valve is easily combined with various drive, good durability and reliability. 
橡胶密封蝶气动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 pneumatic valve, cavitation zone decreases, and in recent years, our country is also developing a metal seal butterfly pneumatic valve, in Japan in recent years also developed cavitation resistance, low vibration, low noise of the comb tooth profile control pneumatic valve. 
一般密封座的寿命在正常情况下，橡胶年- Years and years - metal Years. But how to correctly choose should according to the working condition requirements. 
蝶气动阀的开度与流量之间的关系，基本上呈线性比例变化。 If is used to control the flow, the flow characteristic and pipe flow resistance have close relationship, such as two pneumatic valve diameter pipe installation, forms, etc. All the same, and the pipe loss coefficient, pneumatic valve flow will be a big difference. 
如果气动阀门处于节流幅度较大状态，气动阀板的背面容易发生气蚀，有损坏气动阀门的可能，一般均在°外使用。 
蝶气动阀处于中开度时，气动阀体与蝶板前端形成的开口形状以气动阀轴为中心，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，一侧气动阀体与气动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，而节流侧气动阀门下面会产生负压，往往会出现橡胶密封件脱落。 
蝶气动阀操作力矩，因开度及气动阀门启闭方向不同其值各异，卧式蝶气动阀，特别是大口径气动阀，由于水深，气动阀轴上、下水头差所产生的力矩也不容忽视。 In addition, pneumatic valve inlet side bend, form the bias current, torque will be increased. Of the opening of the pneumatic valve in the middle, because the water flow torque, operators need to be self-locked.
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