原文：
阀门是用以控制流体流量、压力和流向的装置。被控制的流体可以是液体、气体、气液混合体或固液混合体。 阀门通常由阀体、阀盖、阀座、启闭件、驱动机构、密封件和紧固件等组成。 阀门的控制功能是依靠驱动机构或流体驱使启闭件升降、滑移、旋摆或回转运动以改变流道面积的大小来实现的。 阀门的基本参数是工作压力、工作温度和口径。对于大量使用于工业管道的各种阀门，常用公称压力和公称通径作为基本参数。公称压力是指某种材料的阀门，在规定的温度下，允许承受的{zd0}工作压力。公称通径是指阀体与管子联接端部的名义内径。 阀门根据其种类和用途有不同的要求，主要有密封、强度、调节、流通、启闭等性能。在设计和选用阀门时，除了要考虑基本参数和性能外，还要考虑流体的性能，包括流体的相态气体、液体或含固体颗粒、腐蚀性、粘度、毒性、易燃易爆性，贵重稀有程度和放射性等。 阀门的分类按使用功能可分为截断阀、调节阀、止回阀、分流阀、安全阀、多用阀六大类。 截断阀主要用于截断流体通路，包括截止阀、闸阀、旋塞阀、球阀、蝶阀、隔膜阀、夹管阀等； 调节阀主要用于调节流体的压力、流量等，包括调节阀、节流阀、减压阀和浮球调节阀等； 止回阀用于阻止流体的逆向流动； 分流阀用于分配流体的通路去向，或将两相流体分离，包括滑阀、多通阀、疏水阀和排空气阀等； 安全阀主要用于安全保护，防止锅炉、压力容器或管道因超压而破坏； 多用阀是具有一种以上功能的阀门，如截止止回阀既能起断流作用又能起止回作用。 工业管道阀门按公称压力又可分为真空阀、低压阀、中压阀、高压阀、超高压阀；阀门按工作温度又可分为常温阀、中温阀、高温阀、低温阀；阀门还可按驱动装置的类型、与管道的联接方式和阀体的使用材料等进行分类。阀门可按各种分类方法单独地或组合地命名，也可按启闭件的结构特征或具体用途命名。

“ Valve structure and classification of ”是由提供的阀门行业新闻，译文仅供参考。另外，中国减压阀网还提供相关产品搜索： 、 、 、 、 、 、 、 、 、 、 、 、 、 等。

译文：
Valve is used to control fluid flow, pressure and flow devices. The fluid can be controlled is a liquid, gas, gas-liquid mixture or liquid mixture. Valves are usually made up of body, bonnet, seat, hoist parts, drive mechanism, seals and fasteners and other components. Control valves or fluid drive mechanism is driven to rely on pieces of lifting hoist, sliding, rotating or turning motion put to the size of change in flow area to achieve. The basic parameters of the valve is working pressure, temperature and diameter. For large-scale use in industrial pipeline valves, commonly used nominal pressure and nominal diameter as the basic parameters. PN is a material of the valve, the required temperature, to allow maximum exposure to work stress. Nominal diameter pipe is connected with the body on behalf of end diameter. Valve according to the types and uses have different requirements, mainly seals, strength, conditioning, distribution, opening and closing properties. Valve in the design and selection, in addition to the basic parameters and properties to consider, but also consider the performance of fluid, including fluid phase gas, liquid or solid particles containing, corrosive, the viscosity, toxic, flammable and explosive nature , and radioactive and other precious rarity. Valve function can be divided into categories by using cut-off valve, control valve, check valve, diversion valve, safety valve, Multi-valve six categories. Cut off cut-off valve is mainly used for fluid pathway, including the cut-off valves, gate valves, plug valves, ball valves, butterfly valves, diaphragm valves, control valves and other folders; The main control valve for regulating fluid pressure, flow, etc., including control valve, throttle, valve and float valve, etc.; Check valve used to prevent reverse flow of fluid; Shunt valve fluid channel for distribution of destination, or two-phase separated, including slide valves, multi-valve, trap, and emptying valves and so on; Safety valve is mainly used for security, to prevent the boiler, pressure vessel or pipeline overpressure due to the damage; Multi-valve is a valve with more than one function, such as the cut-off valve can both start and end back from the role of the role of drying. Industrial pipe valves by nominal pressure can be divided into the vacuum valve, low pressure valve, the pressure valve, high pressure valves, high pressure valve; valve by valve temperature can be divided into normal temperature, the temperature valve, high temperature valves, cryogenic valves; valve gate drive device can also type in accordance with the pipe connection methods and the use of body materials are classified. Valve can be of various classification methods alone or in combination to name, but also can open and close parts of the structural characteristics or specific purposes named.