球阀是由旋塞演变而来的，它的启闭件作为一个球体，利用球体绕阀杆的轴线旋转90度实现开启和关闭的目的。球阀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。
球阀不仅结构简单、密封性能好，而且在一定的公称通径范围内体积较小、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，是近十几年来发展***快的阀门品种之一。特别是在美、日、德、法、意、西、英等工业发达***，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、节流阀。随着球阀的技术进步，在可以预见的短时见内，特别是在石油***管线上、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，球阀也将会成为主导的阀门类型之一。
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。
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，球体绕阀体中心线作旋转来达到开启、关闭的一种阀门。
原文：
Ball valve is evolved from the cock, its opening and closing parts as a ball, using the ball around the shaft axis of the stem rotation 90 degrees to open and close the goal. Ball valves are mainly used to cut off, distribute and change the flow direction of media in the pipeline.
Ball valve is not only simple structure, good sealing performance, and in a certain range of nominal diameter ***aller volume, light weight, less material c***umption, ***all installation size, and drive torque is ***all, easy to operate, easy to realize the rapid opening and closing, is one of the fastest growing valves varieties in last decade. Especially in America, Japan, Germany, France, Italy, west, the industrial developed countries, such as ball valve has a very wide range of USES, use of variety and quantity continues to expand, and to high temperature and high pressure, big, high sealing, long service life, good regulation performance, and a multifunctional direction valve, its reliability and other performance indicators h***e reached a higher level, and has set up a part replace gate valve, cut-off valve, throttle valve. With the technical progress of ball valves, there will be more extensive applicati*** in the foreseeable short term, especially in oil and gas pipeline, oil refining cracking unit and nuclear industry. In addition, ball valves will be one of the dominant valve types in other industries in large and medium caliber, medium and low pressure areas.
Ball valves operate by rotating the stem to open or close the valve. Ball valve switch lightweight, ***all size, can make it big caliber, reliable sealing, simple structure, convenient maintenance, sealing surface and the spherical often in the closed state, not easily be medium erosion, has been widely used in various industries.
Ball valve and cock valve belong to the same type of valve, only its closing part is a ball, the ball is rotated around the center line of the valve body to open and close a valve.
球阀在管路中主要用来做切断、分配和改变介质的流动方向。球阀是近年来被广泛采用的一种新型阀门，它具有以下优点：
1． 流体阻力小，其阻力系数与同长度的管段相等。
2． 结构简单、体积小、重量轻。
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。
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。
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。
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。
7． 适用范围广，通径从小到几毫米，大到几米，从高真空至高压力都可应用。
球阀已广泛应用于石油、化工、液化气、给排水、食品、制药、发电、造纸、城建、矿产、锅炉蒸汽系统、市政、原子能、航空、火箭等各部门，以及人们日常生活中。
原文：
Ball valves are mainly used to cut off, distribute and change the flow direction of the media in the pipeline. Ball valve is a new type of valve widely used in recent years. It has the following advantages:
1. The resistance coefficient of the fluid is the same as that of the pipe section of the same length.
2. Simple structure, ***all volume and light weight.
3. Compact and reliable, ball valve sealing materials are widely used in plastic, good sealing, in the vacuum system has been widely used.
4. Easy to operate, open and close quickly, from open to close just rotate 90 °, is advantageous for the remote control.
5. Easy maintenance, simple ball valve structure, sealing rings are generally active, easy to disassemble and replace.
6. When fully open or fully closed, the sealing surface of the ball and seat is separated from the medium. When the medium passes through, it will not cause erosion of the sealing surface of the valve.
7. It can be used from high vacuum to high pressure.
Ball valve has been widely used in petroleum, chemical, gas, water supply and drainage, food, pharmaceutical, power generation, paper making, mineral, boiler steam system, urban c***truction, municipal, atomic energy, ***iation, rockets and other departments, as well as People's Daily life.
球阀主要用于接通或阻断管路介质，尤以用在要求迅速开闭的部位更佳，如应急卸荷等处。由于其具有结构简单，零件少，重量轻，密封性能好等优点，应用日趋广泛。结构：主要由阀体、阀盖、密封阀座、球体和阀杆等组成。带孔的球体是球阀的问芯，球体受阀杆的转动来控制启闭，旋转即是全程的开关。球阀可分为浮动球阀和固定球阀两大类。浮动球阀的特点是球体可以自由浮动。根据密封座结构不同又分为固定密封座和带活动密封座两种。固定密封阀座的浮动球阀，结构如图所示，在阀体内装有两个氟塑制成的固定密封阀座，在两间座之间夹紧一个由碳钢或不锈钢制成的浮动球，球体上有圆形通孔，开后时，通道打开；当阀杆转动时，球孔垂直于阀门的通道，靠介质的压力将球体紧压在后面的阀座上，保证阀门的密封。
原文：
Ball valves are mainly used to connect or block pipeline media, especially in places requiring quick opening and closing, such as emergency unloading. Due to its advantages of simple structure, ***all parts, light weight and good sealing performance, it has been widely used. Structure: mainly composed of body, cover, sealing seat, ball and stem. The ball with hole is the core of the ball valve. The ball is controlled by the rotation of the stem. Ball valves can be divided into floating ball valves and fixed ball valves two categories. Floating ball valve is characterized by the ball can float freely. According to the different structure of sealing seat, it can be divided into fixed sealing seat and movable sealing seat. Fixed seal seat floating ball valve, the structure, as shown in the valve body is equipped with two fluorine with molding into fixed sealing seat, seat between two clamped between a floating ball, made of carbon steel or stainless steel sphere has a circular hole, after opening, the channels open; When the stem is rotating, the ball hole is perpendicular to the valve channel and the ball is pressed against the back seat by the pressure of the medium to ensure the valve is sealed