The ball valve is evolved from the plug valve. Its opening and closing parts, as a sphere, use the sphere to rotate 90 degrees around the axis of the valve stem to achieve the purpose of opening and closing. The difference is that the plug body is a sphere with a circular through hole or channel passing through its axis. The ratio of the spherical surface to the channel port should be such that when the ball rotates 90 degrees, all spherical surfaces should appear at the inlet and outlet, so as to cut off the flow.

球阀的作用在管道上主要用于切断、分配和改变介质流动方向，设计成V形开口的球阀还具有良好的流量调节功能。

The function of ball valve is mainly used to cut off, distribute and change the flow direction of medium on the pipeline. The ball valve designed as V-shaped opening also has good flow regulation function.

球阀不仅结构简单、密封性能好，而且在一定的公称通经范围内体积较小、重量轻、材料耗用少、安装尺寸小，并且驱动力矩小，操作简便、易实现快速启闭，球阀的使用非常广泛，使用品种和数量仍在继续扩大，并向高温、高压、大口经、高密封性、长寿命、优良的调节性能以及一阀多功能方向发展，其可靠性及其他性能指标均达到较高水平，并已部分取代闸阀、截止阀、调节阀。

The ball valve not only has simple structure and good sealing performance, but also has small volume, light weight, less material consumption, small installation size, small driving torque, simple operation and easy to realize rapid opening and closing within a certain nominal diameter range. The ball valve is widely used, and its variety and quantity continue to expand, and is developing towards high temperature, high pressure, large diameter, high sealing performance, long service life, excellent regulation performance and multi-function of one valve, Its reliability and other performance indicators have reached a high level, and has partially replaced gate valve, stop valve and regulating valve.

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。完全平等的阀体内，腔为介质提供了阻力很小、直通的流道。通常认为球阀适宜直接做开闭使用，但近来的发展己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。

The ball valve can be closed tightly only by rotating 90 degrees and a small rotating torque. In the completely equal valve body, the cavity provides a very small resistance and direct flow channel for the medium. It is generally considered that the ball valve is suitable for direct opening and closing, but the recent development has designed the ball valve to throttle and control the flow. The main feature of the ball valve is its compact structure and easy operation and maintenance. It is suitable for general working media such as water, solvent and acid, as well as media with poor working conditions, such as oxygen, hydrogen peroxide, methane and ethylene. The valve body of ball valve can be integral or combined.

随着球阀的技术进步，在可以预见的短时见内，特别是在炼油裂解装置上以及核工业上将有更广泛的应用。此外，在其他工业中的大中型口径、中低压力领域，球阀也将会成为主要的阀门类型之一。

With the technological progress of ball valve, it will be more widely used in the foreseeable short term, especially in oil refining and cracking units and nuclear industry. In addition, ball valves will also become one of the main types of valves in large and medium-sized diameter, medium and low pressure fields in other industries.

球阀的优点?

Advantages of ball valve?

1、流体阻力小，其阻力系数与同长度的管段相等；

1. The fluid resistance is small, and its resistance coefficient is equal to that of the pipe section with the same length;

2、结构简单、体积小、重量轻；

2. Simple structure, small volume and light weight;

3、紧密可靠，目前球阀的密封面材料广泛使用塑料、密封性好，在真空系统中也已广泛使用；

3. It is tight and reliable. At present, the sealing surface material of ball valve is widely used in plastic with good sealing performance, and has also been widely used in vacuum system;

4、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；

4. It is easy to operate and open and close quickly. It only needs to rotate 90 ° from full open to full close, which is convenient for remote control;

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；

5. The maintenance is convenient, the structure of the ball valve is simple, the sealing ring is generally movable, and the disassembly and replacement are relatively convenient;

6、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；

6. When fully open or fully closed, the sealing surface of the ball and valve seat is isolated from the medium. When the medium passes through, it will not cause the erosion of the sealing surface of the valve;

7、适用范围广，通径从小到几毫米，大到几米，从高真空高压力都可应用。

7. It has a wide range of applications, ranging from small to a few millimeters and large to a few meters. It can be applied from high vacuum to high pressure.

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