译文：
球阀简介:球阀是用带有圆形通道的球体作启闭件，球体随阀杆转动实现启闭动作的阀门。球阀的启闭件是一个有孔的球体，绕垂直于通道的轴线旋转，从而达到启闭通道的目的。球阀主要供开启和关闭管道和设备介质之用。 球阀主要优点如下： 适用于经常操作，启闭迅速、轻便。 1. 流体阻力小。 2. 结构简单，相对体积小，重量轻，便于维修。 3. 密封性能好 4. 不受安装方向的限制，介质的流向可任意。 5. 无振动，噪声小。 球阀主要缺点如下：球阀按结构形式可分为：浮动球阀、固定球阀、弹性球阀和油封球阀；按通道可分为直能式、角式和三通式等，三通式又可分为T形和L形两种。按连接方工可分为螺纹式连接、法兰连接和焊接式三种。 球阀安装与维护应注意以下事项： 1. 要留有阀柄旋转的位置 2. 不能用作节流。 3. 带传动机构的球阀应直立安装。

“ The role and use of ball ”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：
Ball Description: ball is a sphere with a circular channel for opening and closing parts, ball movement with the valve stem rotation of the valve open and close. Ball valve opening and closing piece is a hole in the ball, around the axis of rotation perpendicular to the channel, so as to achieve the purpose of open and close channels. Ball valve for opening and closing of the main pipelines and equipment used media. Valve main advantages are as follows: Applicable to the regular operation, open and close quickly, light. 1. Fluid resistance. 2. Simple, relatively small size, light weight, ease of maintenance. 3. Sealing performance 4. Not subject to restrictions on the mounting direction, the flow medium can be arbitrary. 5. No vibration, noise. The main disadvantage of ball valve is as follows: ball form of the structure can be divided into: floating ball valve, fixed ball valve, flexible valve and ball valve seals; by channel can be divided into direct energy type, roles, and links-style, etc., 3 general formula can be divided into two T-shaped and L-shaped. By the connected party workers can be divided into threaded connection, flange connection and the welding of three. Ball valve installation and maintenance should note the following: 1. To leave the location of valve handle rotation 2. Not be used as throttling. 3. Belt drive mechanism of the valve should be installed upright.