译文：
　 球阀是由旋塞阀演变而来。它具有相同的旋转90度提动作，不同的是旋塞体是球体，有圆形通孔或通道通过其轴线。球面和通道口的比例应该是这样的，即当球旋转90度时，在进、出口处应全部呈现球面，从而截断流动。 球阀只需要用旋转90度的操作和很小的转动力矩就能关闭严密。xx平等的阀体内腔为介质提供了阻力很小、直通的流道。通常认为球阀最适宜直接做开闭使用，但近来的发展已将球阀设计成使它具有节流和控制流量之用。球阀的主要特点是本身结构紧凑，易于操作和维修，适用于水、溶剂、酸和天然气等一般工作介质，而且还适用于工作条件恶劣的介质，如氧气、过氧化氢、甲烷和乙烯等。球阀阀体可以是整体的，也可以是组合式的。

“ Ball and working principle of evolution ”是由提供的国际阀门新闻，译文仅供参考。另外，中国球阀网还提供相关产品搜索：、、、、等。

原文：
Evolved from the stopcock valve. It has the same movement rotated 90 degrees to mention only difference is that cock body is a sphere, a circular through-hole or channel through its axis. The sphere and the ratio of openings should be such that when the ball rotated 90 degrees, in the import and export of office should be fully rendered sphere, thus cutting off the flow. Just use the rotary valve 90-degree rotation of the operation and a small torque can be closed tightly. The body cavity of full equality for the media to provide a little resistance, through the flow channel. Generally considered the most suitable valve opening and closing done directly used, but the recent development has been designed to give it a throttle valve and control the flow purposes. The main features of valve is its own compact, easy operation and maintenance for water, solvents, acids, and natural gas work in general media, but also applies to poor working conditions of media, such as oxygen, hydrogen peroxide, methane and ethylene, etc. . Ball valve can be integral, it can be modular.