球阀的工作原理是靠旋转阀杆来使阀门畅通或闭塞。球阀开关轻便，体积小，可以做成很大口径，密封可靠，结构简单，维修方便，密封面与球面常在闭合状态，不易被介质冲蚀，在各行业得到广泛的应用。
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.
球阀和旋塞阀是同属一个类型的阀门，只有它的关闭件是个球体，球体绕阀体中线作旋转来达到开启、关闭的一种阀门。
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，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。
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.
三片式球阀是一种比较新型的球阀类别，它有着自身结构所一些优越性，如开关无摩擦，密封不易磨损，启闭力矩小。这样可减小所配执行器的规格。配以多回转电动执行机构，可实现对介质的调节和严密切断。广泛适用于石油、化工、城市给排水等要求严格切断的工况。
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、三片式球阀的注意事项：
1、 Precautions for three piece ball valve:
1、要留有阀柄旋转的位置。
1. The valve handle rotation position shall be reserved.
2、不能用作节流。
2. Cannot be used as throttling.
3、带传动机构的球阀应直立安装。
3. Ball valve with transmission mechanism shall be installed vertically.
二、三片式球阀的工作原理：
2、 Working principle of three piece ball valve:
是靠旋转阀恋来使阀门畅通或闭塞。球阀开关轻便，体积小，可以做成很大口径，密封可靠，结构简单，维修方便，密封面与球面常在闭合状态，不易被介质冲蚀，在各行业有着广泛的应用。本类阀门在管道中一般应当水平安装。
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、三片式球阀的优点：
3、 Advantages of three piece 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 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，开闭迅速，从全开到全关只要旋转90°，便于远距离的控制。
4. Easy to operate, quick to open and close, only rotate 90 ° from full open to full close, convenient for remote control.
5、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 ball valve structure is simple, the sealing ring is generally movable, and it is convenient to disassemble and replace.
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 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、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。球旋转90度时，在进、出口处应全部呈现球面，从而截断流动。
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.
三片式球阀是一种比较新型的球阀类别，它有着自身结构所拥有的一些优越性，如开关无摩擦，密封不易磨损，启闭力矩小。这样可减小所配执行器的规格。广泛适用于石油、化工、城市给排水等要求严格切断的工况。
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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