译文：
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、发电、造纸、原子能、航空、火箭等各部门，以及人们日常生活中。 球阀按结构形式可分： 一、浮动球球阀 球阀的球体是浮动的，在介质压力作用下，球体能产生一定的位移并紧压在出口端的密封面上，保证出口端密封。 浮动球球阀的结构简单，密封性好，但球体承受工作介质的载荷全部传给了出口密封圈，因此要考虑密封圈材料能否经受得住球体介质的工作载荷。这种结构，广泛用于中低压球阀。 二、固定球球阀 球阀的球体是固定的，受压后不产生移动。固定球球阀都带有浮动阀座，受介质压力后，阀座产生移动，使密封圈紧压在球体上，以保证密封。通常在与球体的上、下轴上装有轴承，操作扭距小，适用于高压和大口径的阀门。 为了减少球阀的操作扭矩和增加密封的可靠程度，近年来又出现了油封球阀，既在密封面间压注特制的润滑油，以形成一层油膜，即增强了密封性，又减少了操作扭矩，更适用高压大口径的球阀。 三、弹性球球阀 球阀的球体是弹性的。球体和阀座密封圈都采用金属材料制造，密封比压很大，依靠介质本身的压力已达不到密封的要求，必须施加外力。这种阀门适用于高温高压介质。 弹性球体是在球体内壁的下端开一条弹性槽，而获得弹性。当关闭通道时，用阀杆的楔形头使球体涨开与阀座压紧达到密封。在转动球体之前先松开楔形头，球体随之恢复原原形，使球体与阀座之间出现很小的间隙，可以减少密封面的摩擦和操作扭矩。 球阀按其通道位置可分为直通式，三通式和直角式。后两种球阀用于分配介质与改变介质的流向。

“ And classification of the advantages of ball valves ”是由提供的国际阀门新闻，译文仅供参考。另外，中国球阀网还提供相关产品搜索：、、、、等。

原文：
Valve in the pipeline is mainly used to do cut, distribution and change the direction of media flow. Ball is widely used in recent years, a new type of valve, it has the following advantages: 1. Fluid resistance is small, the drag coefficient with the same length of pipe equal. 2. Simple structure, small size and light weight. 3. Close and reliable valve sealing surface material is currently widely used in plastic, sealing well, in the vacuum system has also been widely used. 4. Easy to operate, opening and closing rapidly, from fully open to fully closed as long as the rotation 90 °, to facilitate remote control. 5. Easy maintenance, valve structure is simple, seals are generally activities, and demolition are relatively easy to replace. 6. In the fully open or fully closed, the ball and valve seat sealing surface and the dielectric isolation, medium passed, will not cause the erosion of the valve sealing surface. 7. Wide application and a few millimeters diameter from small to large as a few meters from the high vacuum to high pressure can be applied. Ball has been widely used in petroleum, chemical, power generation, paper, atomic energy, aviation, rockets and other departments, as well as people's daily life. Ball valve according to structure can be divided into: A floating ball valve The sphere is a floating ball valve in the medium under pressure to produce a certain degree of displacement of the sphere, and pressed in the export side of the sealing surface to ensure that the export side seal. Floating ball valve of simple structure, good sealing, but the ball to bear the load all the working medium to pass the export ring, so to consider the ring material can withstand the work load of the sphere medium. This structure is widely used in the low-pressure valve. 2, fixed ball valve The ball valve is fixed, the pressure does not produce after the move. Fixed ball valve comes with a floating valve seat, by the medium pressure, the seat produce movement, so that pressed the ball on the ring to ensure sealing. Usually with the sphere of the upper and lower shaft bearings, operating torque is small, applied to high pressure and large-diameter valve. In order to reduce torque and increase the operation of valve sealing reliability of the valve seal has emerged in recent years, both in injection pressure between the sealing surface of a special lubricant, to form a layer of film that enhances the tightness, but also reduce operating torque, more suitable for large-diameter high-pressure valve. 3, elastic ball valve The ball valve is flexible. Ball and valve seat ring are the use of metal materials, sealing pressure than the large, relying on media itself can not seal the pressure has reached the requirements to be imposed by external force. Such valves for high temperature and pressure medium. Elastic sphere is the sphere wall to open the bottom of an elastic groove, and get flexible. When the closed channel, with the stem of the wedge-shaped head to compress the sphere rose up to open with the valve seat seal. In the sphere before turning loose wedge head, ball the subsequent restoration of the original prototype, so that sphere with a small gap between the valve seat, sealing surface can reduce friction and operating torque. Valve according to their channel positions can be divided into straight-through processing, three-and right-angle type. After two kinds of ball valves for the distribution media and change the flow of media.