[{"data":1,"prerenderedAt":387},["ShallowReactive",2],{"knowledge-flange-types":3},{"id":4,"title":5,"body":6,"description":376,"extension":377,"meta":378,"navigation":382,"path":383,"seo":384,"stem":385,"__hash__":386},"content/knowledge/flange-types.md","法兰类型大全：7种常见法兰的特点与应用",{"type":7,"value":8,"toc":363},"minimark",[9,13,18,25,53,57,63,85,89,95,117,121,127,148,152,158,180,184,190,212,216,222,243,246,346,349],[10,11,12],"p",{},"法兰（Flange）是管道工程中最常用的连接件之一。根据连接方式和结构形式的不同，法兰可分为多种类型。本文将详细介绍 7 种最常见的法兰类型。",[14,15,17],"h2",{"id":16},"_1-对焊法兰-wn-weld-neck","1. 对焊法兰 (WN - Weld Neck)",[10,19,20,24],{},[21,22,23],"strong",{},"对焊法兰","是应用最广泛、强度最高的法兰类型之一。其特点是法兰颈部与管道通过对接焊缝连接，颈部锥形过渡设计能有效分散应力。",[26,27,28,35,41,47],"ul",{},[29,30,31,34],"li",{},[21,32,33],{},"适用场景","：高温、高压、频繁弯曲的管道系统",[29,36,37,40],{},[21,38,39],{},"压力范围","：PN2.5 ~ PN400",[29,42,43,46],{},[21,44,45],{},"优点","：强度高、抗疲劳性好、应力分布均匀",[29,48,49,52],{},[21,50,51],{},"缺点","：成本较高、安装需要对接焊接",[14,54,56],{"id":55},"_2-带颈平焊法兰-so-slip-on","2. 带颈平焊法兰 (SO - Slip On)",[10,58,59,62],{},[21,60,61],{},"带颈平焊法兰","是最常用的法兰类型，管道插入法兰内孔后进行角焊缝焊接。安装简便，价格适中。",[26,64,65,70,75,80],{},[29,66,67,69],{},[21,68,33],{},"：中低压管道系统，应用最为广泛",[29,71,72,74],{},[21,73,39],{},"：PN2.5 ~ PN40",[29,76,77,79],{},[21,78,45],{},"：安装方便、成本适中、应用范围广",[29,81,82,84],{},[21,83,51],{},"：不适合高压和剧烈振动场合",[14,86,88],{"id":87},"_3-板式平焊法兰-pl-plate","3. 板式平焊法兰 (PL - Plate)",[10,90,91,94],{},[21,92,93],{},"板式平焊法兰","结构最为简单，由一块平板加工而成，适合低压场合使用。",[26,96,97,102,107,112],{},[29,98,99,101],{},[21,100,33],{},"：低压、常温、无毒介质管道",[29,103,104,106],{},[21,105,39],{},"：PN2.5 ~ PN16",[29,108,109,111],{},[21,110,45],{},"：结构简单、成本最低、加工方便",[29,113,114,116],{},[21,115,51],{},"：刚性较差，不适合高压场合",[14,118,120],{"id":119},"_4-盲板法兰-bl-blind","4. 盲板法兰 (BL - Blind)",[10,122,123,126],{},[21,124,125],{},"盲板法兰","用于封堵管道末端或设备接口，没有中心孔。在管道检修时也常用作临时封堵。",[26,128,129,134,138,143],{},[29,130,131,133],{},[21,132,33],{},"：管端封堵、检修临时封堵、压力测试",[29,135,136,40],{},[21,137,39],{},[29,139,140,142],{},[21,141,45],{},"：密封可靠、拆装方便",[29,144,145,147],{},[21,146,51],{},"：承受弯矩能力大，选型时需注意",[14,149,151],{"id":150},"_5-承插焊法兰-sw-socket-weld","5. 承插焊法兰 (SW - Socket Weld)",[10,153,154,157],{},[21,155,156],{},"承插焊法兰","适用于小口径管道（一般 DN ≤ 80），管道插入法兰承口后焊接。",[26,159,160,165,170,175],{},[29,161,162,164],{},[21,163,33],{},"：小口径高压管道、仪表管线",[29,166,167,169],{},[21,168,39],{},"：PN16 ~ PN160",[29,171,172,174],{},[21,173,45],{},"：安装对中性好、焊接质量容易保证",[29,176,177,179],{},[21,178,51],{},"：仅适用于小口径",[14,181,183],{"id":182},"_6-螺纹法兰-th-threaded","6. 螺纹法兰 (TH - Threaded)",[10,185,186,189],{},[21,187,188],{},"螺纹法兰","通过内螺纹与管道外螺纹连接，无需焊接。适合不允许焊接的场合。",[26,191,192,197,202,207],{},[29,193,194,196],{},[21,195,33],{},"：不允许焊接的管道、易燃易爆环境",[29,198,199,201],{},[21,200,39],{},"：PN2.5 ~ PN25",[29,203,204,206],{},[21,205,45],{},"：无需焊接、拆装便捷",[29,208,209,211],{},[21,210,51],{},"：密封性不如焊接法兰",[14,213,215],{"id":214},"_7-松套法兰-lj-lap-joint","7. 松套法兰 (LJ - Lap Joint)",[10,217,218,221],{},[21,219,220],{},"松套法兰","由法兰环和翻边短节两部分组成，法兰环可以在管道上自由旋转，便于螺栓孔对位。",[26,223,224,229,233,238],{},[29,225,226,228],{},[21,227,33],{},"：需要频繁拆装检修的管道",[29,230,231,74],{},[21,232,39],{},[29,234,235,237],{},[21,236,45],{},"：拆装便捷、法兰可复用、节省贵金属材料",[29,239,240,242],{},[21,241,51],{},"：承压能力较低",[14,244,245],{"id":245},"法兰选型建议",[247,248,249,265],"table",{},[250,251,252],"thead",{},[253,254,255,259,262],"tr",{},[256,257,258],"th",{},"使用场景",[256,260,261],{},"推荐类型",[256,263,264],{},"原因",[266,267,268,280,291,302,313,324,335],"tbody",{},[253,269,270,274,277],{},[271,272,273],"td",{},"高温高压管道",[271,275,276],{},"WN 对焊法兰",[271,278,279],{},"强度最高，抗疲劳",[253,281,282,285,288],{},[271,283,284],{},"一般工业管道",[271,286,287],{},"SO 带颈平焊",[271,289,290],{},"性价比高，安装方便",[253,292,293,296,299],{},[271,294,295],{},"低压通用场合",[271,297,298],{},"PL 板式平焊",[271,300,301],{},"成本最低",[253,303,304,307,310],{},[271,305,306],{},"管端封堵",[271,308,309],{},"BL 盲板法兰",[271,311,312],{},"密封可靠",[253,314,315,318,321],{},[271,316,317],{},"小口径高压",[271,319,320],{},"SW 承插焊",[271,322,323],{},"焊接质量好",[253,325,326,329,332],{},[271,327,328],{},"禁止焊接环境",[271,330,331],{},"TH 螺纹法兰",[271,333,334],{},"无需焊接",[253,336,337,340,343],{},[271,338,339],{},"频繁检修",[271,341,342],{},"LJ 松套法兰",[271,344,345],{},"拆装方便",[14,347,348],{"id":348},"在线获取法兰报价",[10,350,351,352,357,358,362],{},"了解了法兰类型后，您可以使用智报价的 ",[353,354,356],"a",{"href":355},"/demo/flange/interactive","AI 实时报价"," 功能，输入法兰规格即可获得精准报价。也可以使用 ",[353,359,361],{"href":360},"/tools/weight-calculator","法兰重量计算器"," 快速估算理论重量。",{"title":364,"searchDepth":365,"depth":365,"links":366},"",2,[367,368,369,370,371,372,373,374,375],{"id":16,"depth":365,"text":17},{"id":55,"depth":365,"text":56},{"id":87,"depth":365,"text":88},{"id":119,"depth":365,"text":120},{"id":150,"depth":365,"text":151},{"id":182,"depth":365,"text":183},{"id":214,"depth":365,"text":215},{"id":245,"depth":365,"text":245},{"id":348,"depth":365,"text":348},"详细介绍对焊法兰(WN)、平焊法兰(SO/PL)、盲板法兰(BL)、承插焊法兰(SW)、螺纹法兰(TH)、松套法兰(LJ)的结构特点、适用场景和选型建议。","md",{"category":379,"keywords":380,"date":381},"法兰基础","法兰类型,法兰分类,对焊法兰,平焊法兰,盲板法兰,承插焊法兰,螺纹法兰,松套法兰,法兰选型","2026-01-01",true,"/knowledge/flange-types",{"title":5,"description":376},"knowledge/flange-types","WcLuWY1NBsw2crP9rVXS54ptv1evoBbpkK--Dy4BWqg",1780846562535]