恰当的选择球阀和蝶阀

译文：
球阀和蝶阀都是比较常用的阀门。有些场合是可以通用的，而有些工况又是只能用其中的一种的。两者的区别主要在于结构和开关原理。我们简要分析： 球阀：旋塞阀演变而来，启闭件是球体。特点是：1、低流阻；2、较大的压力和较高温度下，可实现完全密封；3、可快速启闭；4、其密封结构决定其比较设和腐蚀性接孩子；5、阀体对称，可以有效承受管道压力，可应付高压工况； 蝶阀：启闭件是圆盘式左右开启，特点是：1、结构简单、体积小、安装方便；2、流阻系数小，启闭迅速，；3、可用于大口径阀门；4、可应用不同的密封面，使用各种环境，包括粉状、颗粒状介质等； 蝶阀相对于球阀，密封性稍差，但大口径阀门中，蝶阀比球阀要具有得天独厚的优势；当做调节流量用时，蝶阀调节范围不大，而V型调节球阀，调节精确。另外，在高压管路中，球阀要比蝶阀具有优势。

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原文：
Ball and butterfly valves are more commonly used. Some situations can be generic, while some condition is one of them can only be used for. The main difference between the two isPIPELINE BALL VALVE FOR LONG-DISTANCE TRANSPORTATION that the structure and switching principle. Our brief analysis: Ball: plug valves evolved hoisting pieces of a sphere. Features are: 1, low-flow resistance; 2, the larger the pressure and high temperature can be completely sealed; 3, can quickly open and close; 4, its sealed structure to determine its more established and corrosive pick up their kids; 5, Body symmetry, can effectively withstand the pressure pipe can cope with high-pressureV-SHAPED REGULATION BALL VALVE condition; Butterfly: headstock piece is a disc about to open, is characterized by: 1, simple structure, small volume, easy installation; 2, flow resistance coefficient is small, open and close quickly; 3 can be used for large-diameter valves; 4, can be applied to different sealing surface, using a variety of environments, including powder, granular media, etc.; Butterfly relative to the valve, sealing a bit weak, but the large-diameter valves, butterfly valve to beFLANGE-CONNECTION FIXED BALL VALVE compared with a unique advantage; as regulating traffic to use when the little butterfly adjustment range, while the V-regulator valve, precise adjustment. In addition, high-pressure pipeline, the ball than the butterfly advantage.