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原文
A common standard welded flange Welded flange in use have different classification criteria, in accordance with certain ways and means to use and promote the important role and value display, the user can bring some convenience and value. Pipe flanges and pipe connections can be divided into five basic types: flat welding flange, welded flange, threaded flange, socket welding flange, loose flange. Flange sealing surface has a variety, commonly used with convex (RF), concave (FM), concave-convex surface (MFM), tongue and groove face (TG), the whole plane (FF), ring joint face (RJ). Welded flange: for the corresponding flange and pipe welding, reasonable structure, strength and stiffness to withstand repeated bending and high temperature and pressure and temperature fluctuations, reliable sealing, nominal pressure 0.25 ~ 2.5MPa on welding flange seal surface using bump. Flat welding flange: nominal pressure of not more than 2.5MPa for the carbon steel pipe connections. Flat welding flange sealing surface can be made smooth type, bump-and tenon slot three. Flat welding flange smooth application of the largest, multi-media conditions for the more relaxed circumstances, such as low non-clean air, low pressure circulating water, it has the advantage of cheaper prices. Different forms of the flange in use with different value and role of theory in the correct way and get used to ensure that in use with good quality inspection.
原文来自：http://www.strainer.org.cn

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译文：
对焊法兰在使用中具有不同的分类标准，按照一定的方式和方法使用和推广，施展重要的作用和价值，能够为使用者带来一定的方便和价值。　　管道法兰按与管子的连接方式可分为五种基本类型：平焊法兰、对焊法兰、螺纹法兰、承插焊法兰、松套法兰。法兰的密封面型式有有多种，一般常用有凸面（RF）、凹面（FM）、凹凸面（MFM）、榫槽面（TG）、全平面（FF）、环连接面（RJ）。　　对焊法兰：用于法兰与管子的对口焊接，其结构合理，强度与刚度较大，经得起高温高压及反复弯曲和温度波动，密封性可靠，公称压力为0.25～2.5MPa的对焊法兰采用凹凸式密封面。　　平焊法兰：适用于公称压力不超过2.5MPa的碳素钢管道连接。平焊法兰的密封面可以制成光滑式，凹凸式和榫槽式三种。光滑式平焊法兰的应用量最大，多用于介质条件比较缓和的情况下，如低压非净化压缩空气、低压循环水，它的优点是价格比较便宜。　　不同形式的法兰在使用中具有不同的使用价值和作用，按照正确得到方式和原理使用，保证在使用中具有良好的质量检验。　　

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