The working principle of the ball valve is to make the valve unblocked or blocked by rotating the valve rod. The ball valve has the advantages of light switch, small volume, large diameter, reliable sealing, simple structure and convenient maintenance. The sealing surface and spherical surface are often closed and are not easy to be eroded by the medium. It is widely used in various industries.

球閥和旋塞閥是同屬一個類型的閥門，只有它的關閉件是個球體，球體繞閥體中線作旋轉來達到開啟、關閉的一種閥門。

Ball valve and plug valve belong to the same type of valve. Only its closing part is a sphere. The sphere rotates around the center line of the valve body to open and close.

三片式球閥只需要用旋轉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，發展已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、酸和天然氣等一般工作介質，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 three piece ball valve can be closed tightly with only 90 degree rotation and a small rotating torque. The completely equal inner cavity of the valve body provides the medium with a very small resistance and straight flow passage. It is generally considered that the ball valve is suitable for direct opening and closing. The ball valve has been designed to throttle and control flow. The main features of the ball valve are its compact structure, easy operation and maintenance. It is suitable for general working media such as water, solvent, acid and natural gas, and also suitable for media with poor working conditions, such as oxygen, hydrogen peroxide, methane and ethylene. The ball valve body can be integral or combined.

三片式球閥是一種比較新型的球閥類別，它有著自身結構所一些優越性，如開關無摩擦，密封不易磨損，啟閉力矩小。這樣可減小所配執行器的規格。配以多回轉電動執行機構，可實現對介質的調節和嚴密切斷。廣泛適用于石油、化工、城市給排水等要求嚴格切斷的工況。

Three piece ball valve is a relatively new type of ball valve. It has some advantages of its own structure, such as no friction on the switch, uneasy wear on the seal, and small opening and closing torque. This reduces the size of the actuator. Equipped with multi turn electric actuator, the medium can be adjusted and cut off tightly. It is widely used in petroleum, chemical industry, urban water supply and drainage and other working conditions requiring strict cut-off.

一、三片式球閥的注意事項：

1、 Precautions for three piece ball valve:

1、要留有閥柄旋轉的位置。

1. The valve handle rotation position shall be reserved.

2、不能用作節流。

2. Cannot be used as throttling.

3、帶傳動機構的球閥應直立安裝。

3. Ball valve with transmission mechanism shall be installed vertically.

二、三片式球閥的工作原理：

2、 Working principle of three piece ball valve:

是靠旋轉閥戀來使閥門暢通或閉塞。球閥開關輕便，體積小，可以做成很大口徑，密封可靠，結構簡單，維修方便，密封面與球面常在閉合狀態，不易被介質沖蝕，在各行業有著廣泛的應用。本類閥門在管道中一般應當水平安裝。

The valve is unblocked or blocked by rotating the valve. The ball valve has the advantages of light switch, small volume, large diameter, reliable sealing, simple structure and convenient maintenance. The sealing surface and spherical surface are often closed and are not easy to be eroded by the medium. It is widely used in various industries. Generally, this type of valve shall be installed horizontally in the pipeline.

三、三片式球閥的優點：

3、 Advantages of three piece 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 compact and reliable. At present, plastic is widely used as the sealing surface material of ball valve, with good sealing performance. It 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. Easy to operate, quick to open and close, only rotate 90 ° from full open to full close, 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 ball valve structure is simple, the sealing ring is generally movable, and it is convenient to disassemble and replace.

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 the valve is fully open or closed, the sealing surface of the ball and valve seat is isolated from the medium. When the medium passes through, the valve sealing surface will not be eroded.

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。球旋轉90度時，在進、出口處應全部呈現球面，從而截斷流動。

7. It has a wide range of applications, ranging from small diameter to several millimeters and large diameter to several meters, and can be applied from high vacuum to high pressure. When the ball rotates for 90 degrees, the inlet and outlet shall be all spherical, so as to cut off the flow.

三片式球閥是一種比較新型的球閥類別，它有著自身結構所擁有的一些優越性，如開關無摩擦，密封不易磨損，啟閉力矩小。這樣可減小所配執行器的規格。廣泛適用于石油、化工、城市給排水等要求嚴格切斷的工況。

Three piece ball valve is a relatively new type of ball valve. It has some advantages of its own structure, such as no friction on the switch, uneasy wear on the seal, and small opening and closing torque. This reduces the size of the actuator. It is widely used in petroleum, chemical industry, urban water supply and drainage and other working conditions requiring strict cut-off.

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