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原文
Ball main features: 1. Ball from the direction of installation restrictions, the flow of the medium can be any. Fluid resistance is small, full bore ball valve little flow resistance. 2. Valve structure is simple, relatively small size, light weight, ease of maintenance. 3. Close and reliable. It has two sealing surfaces, and the current valve sealing surface material widely used in various plastics, sealing, and can be completely sealed. In the vacuum system has also been widely used. 4. Valve for the regular operation, open and close quickly, lightweight. Easy to operate, opening and closing rapidly, from fully open to fully closed as long as the rotation 90 °, to facilitate the remote control. 5. Easy maintenance, simple ball valve, seals are generally active, are relatively easy to replace demolished. 6. Valve seal. In the fully open or fully closed, the ball and seat sealing surface and the dielectric isolation, the medium through, will not cause erosion of the valve sealing surface. 7. Wide range of applications, from small to a few millimeters in diameter, large meters, from high vacuum to high pressure can be applied. 8. As the ball in the open and close in the process of wiping nature, it can be used with suspended solid particles of the medium. 9, the valve fluid resistance. 10, the valve no vibration, noise.
原文来自：http://www.ballvalve.org.cn

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译文：
球阀主要特性: 　　1．球阀不受安装方向的限制，介质的流向可任意。流体阻力小，全通径的球阀基本没有流阻。　　2．球阀结构简单，相对体积小，重量轻，便于维修。　　3．紧密可靠。它有两个密封面，而且目前球阀的密封面材料广泛使用各种塑料，密封性好，能实现完全密封。在真空系统中也已广泛使用。　　4．球阀适用于经常操作，启闭迅速、轻便。操作方便，开闭迅速，从全开到全关只要旋转90°，便于远距离的控制。　　5．维修方便，球阀结构简单，密封圈一般都是活动的，拆卸更换都比较方便。　　6．球阀密封性能好。在全开或全闭时，球体和阀座的密封面与介质隔离，介质通过时，不会引起阀门密封面的侵蚀。　　7．适用范围广，通径从小到几毫米，大到几米，从高真空至高压力都可应用。　　8．由于球阀在启闭过程中有擦拭性，所以可用于带悬浮固体颗粒的介质中。 9、球阀流体阻力小。 10、球阀无振动，噪声小。

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