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.

球閥的作用在管道上主要用于切斷、分配和改變介質流動方向，設計成V形開口的球閥還具有良好的流量調節功能。

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.

球閥不僅結構簡單、密封性能好，而且在一定的公稱通經范圍內體積較小、重量輕、材料耗用少、安裝尺寸小，并且驅動力矩小，操作簡便、易實現快速啟閉，球閥的使用非常廣泛，使用品種和數量仍在繼續擴大，并向高溫、高壓、大口經、高密封性、長壽命、優良的調節性能以及一閥多功能方向發展，其可靠性及其他性能指標均達到較高水平，并已部分取代閘閥、截止閥、調節閥。

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.

球閥只需要用旋轉90度的操作和很小的轉動力矩就能關閉嚴密。完全平等的閥體內，腔為介質提供了阻力很小、直通的流道。通常認為球閥適宜直接做開閉使用，但近來的發展己將球閥設計成使它具有節流和控制流量之用。球閥的主要特點是本身結構緊湊，易于操作和維修，適用于水、溶劑、酸等一般工作介質，而且還適用于工作條件惡劣的介質，如氧氣、過氧化氫、甲烷和乙烯等。球閥閥體可以是整體的，也可以是組合式的。

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.

隨著球閥的技術進步，在可以預見的短時見內，特別是在煉油裂解裝置上以及核工業上將有更廣泛的應用。此外，在其他工業中的大中型口徑、中低壓力領域，球閥也將會成為主要的閥門類型之一。

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.

球閥的優點?

Advantages of ball valve?

1、流體阻力小，其阻力系數與同長度的管段相等；

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

2、結構簡單、體積小、重量輕；

2. Simple structure, small volume and light weight;

3、緊密可靠，目前球閥的密封面材料廣泛使用塑料、密封性好，在真空系統中也已廣泛使用；

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，開閉迅速，從全開到全關只要旋轉90°，便于遠距離的控制；

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、維修方便，球閥結構簡單，密封圈一般都是活動的，拆卸更換都比較方便；

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、在全開或全閉時，球體和閥座的密封面與介質隔離，介質通過時，不會引起閥門密封面的侵蝕；

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、適用范圍廣，通徑從小到幾毫米，大到幾米，從高真空至高壓力都可應用。

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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