标题：对夹双瓣蝶形止回阀
对夹双瓣蝶形止回阀用途及结构特点
对夹双瓣蝶形止回阀适用于公称压力PN1.0MPa~42.0MPa、CLASS150Lb~2500Lb；公称通径DN15mm～1200mm、NPS1/2”~48”；工作温 度－196C~540C的各种管道上，用于防止介质倒流。上海埃非凯阀门有限公司生产的ENH76系列对夹双瓣蝶形止回阀通过选用不同的材质，可适用于水、蒸汽、油品、硝酸、强氧化性介质及尿素等多种介质。
为了防止介质逆流，在设备、装置和管道上都应安装止回阀。
对夹双瓣蝶形止回阀的主要特点是：
1、对夹双瓣蝶形止回阀结构长度短，其结构长度只有传统法兰止回阀的1/4~1/8; 
2、体积小，重量轻，其重量只有传统法兰止回阀的1/4~1/20; 
3、对夹双瓣蝶形止回阀阀瓣关闭快速，水锤压力小； 
4、水平管道和垂直管道都可以使用，安装方便； 
5、对夹双瓣蝶形止回阀流到通畅，流体阻力小；
6、动作灵敏，密封性能好； 
7、对夹双瓣蝶形止回阀阀瓣行程短，冲击力小； 
8、整体结构简单紧凑，造型美观； 
9、使用寿命长，可靠性高。
对夹双瓣蝶形止回阀主要性能规范及部件材质
公称压力产品型号主要 
零件 
材料阀体WCBZG1Gr-18Ni9TiCF8CF3ZG1Gr-18Ni12Mo2TiCF8MCF3M阀瓣、阀座、弹簧2Cr131Gr18Ni9Ti0Gr18Ni9(304)00Gr18Ni10(304L)1Gr18Ni-12Mo2Ti0Gr18Ni12-Mo2(310)00Gr17Ni14-Mo2(316L)适用 
工况适用介质水、蒸汽、 
油品等硝酸等腐蚀性介质强氧化性介质醋酸等腐蚀性介质尿素等腐蚀性介质工作温度℃≤450≤200
对夹双瓣蝶形止回阀主要标准与规范
设计与制造：AP1594、API6D、JB/T8937 结构长度：API594、API6D、DIN3202、JB/T8937； 压力-温度等级：ANSI B 16.34、DIN2401、GB/T9124、HG20604、HG20605、SH3406、JB/T74 试验与检验：API598、JB/T9092 配管法兰：JB/T74-90、GB/T9112-9124、HG20592-20635、SH3406、ANSIB16.5、DIN2543-2548、GB/T 13402、 API605、ASMEB16.47. 
H76系列对夹双瓣蝶形止回阀主要尺寸及重量
压力级口 径尺寸（mm）重量配 管 法 兰 （供参考）NPSDNLDD3D2(㎏)螺栓孔中心 圆直径D1螺栓 数量螺栓直径d螺栓长径L1inmmRFRJClass 150 PN 2.0MPa2506010356512120.545/8M161401552 1/2656712273653139.545/8M161501653807313588804152.545/8M161601754100731731081026190.585/8M161701855125861951321278216.083/4M2019020561509822016015213241.583/4M20205220820012727721020325298.583/4M202402551025014633726625439362.0127/8M242702851230018140731030554432.0127/8M243103251435018444835535080476.0121M2732534016400191512405400117540.0161M2734035518450203547455450138578.0161 1/8M3036538020500219604505500163635.0201 1/8M3038540024600222715605600331749.5201 1/4M3340542028700305773700700380795.5403/4M20455-30750305824750746425846.0443/4M20455-32800305878800796560900.0483/4M20460-369003689839108986401009.5447/8M24540-4210504321142105510509601171.5481M27625-48120052413021205120014001335.0441 1/8M30740-Class 300Lb PN 5.0MPa2506011058513127.085/8M161551752 1/2656712873654149.083/4M201751953807314788806168.583/4M201902104100731791081028200.083/4M2019521551258621413212715235.083/4M2021523561509824916015218270.0123/4M20230250820012730521020331330.0127/8M242803001025014635926625451287.5161M273153351230018142031030577451.0161 1/8M3036538514350222483355350117514.5201 1/8M3041043016400232537405400190571.5201 1/4M3343545518450264594455450200628.5241 1/4M3347549520500292652505500265686.0241 1/4M3351053524600318772608600410813.0241 1/2M3956058530750368882740735660921.0361 3/8M36650-36900483104488087310201089.0321 5/8M42800-42105056811961045103515401244.5361 3/4M45920-48120062913651190117922601416.0401 7/8M481010-压力级口 径尺寸（mm）重量配 管 法 兰 （供参考）NPSDNLDD3D2(㎏)螺栓孔中心 圆直径D1螺栓 数量螺栓直径d螺栓长径L1inmmRFRJClass 600Lb PN 11.0 MPa2506011058514127.085/8M161751802 1/2656712873655149.083/4M201952003807314788808168.583/4M2021021541007919110810211216.087/8M24235240512510523913612720267.081M27280285615013626416215226292.0121M27320325820016531821220055349.0121 1/8M303703751025021339826625095432.0161 1/4M3344044512300229455312305140489.0201 1/4M3346046514350273490355337223527.0201 3/8M3652052516400305562400387360603.0201 1/2M3957558018450362610450438395654.0201 5/8M4265065520500368680500489518724.0241 5/8M4267068024600438786600591836838.0241 7/8M48780790Class 900Lb PN 15.0 MPa2507014058518165.081 7/8M242252302 1/26583162736511190.581M2725025538083165908014190.587/8M24240245410010220410810220235.081 1/8M30285290512511024513612730279.581 1/4M33310315615015928616215042317.5121 1/8M30365370820020635621220084393.5121 3/8M3644044510250241432266250145470.0161 3/8M36490495123002962495312305220533.5201 3/8M3656056514350356518355337350559.0201 1/2M3964565516400384572400387470616.0201 5/8M4268569518450451635450438605686.0201 7/8M4879080520500451695496487820749.5202M52810825246004958356005911050901.5202 1/2M64945965Class 1500Lb PN 26.0 MPa2507014058518165.087/8M242252302 1/26583162736511190.582M2725025538083172908019203.081 1/8M30240275410010220710810226241.581 1/4M33310315512511025213612751292.081 1/2M39370375615015928016215068317.5121 3/8M364304408200206350212200130393.5121 5/8M4251052010250248433266254210482.5121 7/8M4860061012300305518312305384571.5162M5269571514350356576355337550635.0162 1/4M56775800 16400384639400387635705.0162 1/2M64850880压力级口 径尺寸（mm）重量配 管 法 兰 （供参考）NPSDNLDD3D2(㎏)螺栓孔中心 圆直径D1螺栓 数量螺栓直径d螺栓长径L1inmmRFRJClass 2500Lb PN 42.0 MPa25070143484210171.581M272552602 1/26583166585218197.081 1/8M3029030538086194686226228.581 1/4M333203304100105232948840273.081 1/2M39370380512511027710610059324.081 3/4M45420435615015931516215090368.582M525155308200206385186180150438.0122M5260062010250254474232225240539.5122 1/2M6475077512300305547272266440619.0122 3/4M70855885公称 压力 PN MPa公称通径 DN mm尺寸(mm)重 量 (㎏)配管法兰(供参考)LDD3D2螺栓孔中心 圆直径D1螺栓 数量螺栓 直径d螺栓 长度L1PN 1.0MPa5060108565121254M161506567128736531454M161558073142888041608M161601007316210810261808M161651258619213212782108M1618015098218160152132408M20205200127273210203242958M202352501463282662543735012M202553001813783103055040012M202903501844383553507646016M2029540019148940540011051516M2431045020353945545013556520M2432550021959450550015862020M2434560022269660560032072520M2735570030581170069538084024M2744080030591880079656095024M304509003681018903898640105028M305201000432112410551050900116028M3359012005241340120512001400138032M36695PN 1.6MPa5060108565121254M161506567128736531454M161558073142888041608M16160公称 压力 PN MPa公称通径 DN mm尺寸(mm)重 量 (㎏)配管法兰(供参考)LDD3D2螺栓孔中心 圆直径D1螺栓 数量螺栓 直径d螺栓 长度L1PN 1.6MPa1007316210810261808M161651258619213212782108M1618015098218160152132408M202052001272732102032429512M202352501463292662543735512M242653001813843103055041012M243053501844443553507647016M2431040019149640540011052516M2733045020355645545013558520M2734550021961850550015865020M3037060022273260560032077020M3338070030580270069538084024M3347080030591280079656095024M364759003681012903898640105028M365451000432112610551050900117028M3962012005241340120512001400139032M45735PN 2.5MPa5060108565121254M161506567128736531458M161608073142888041608M161701007316810810261908M201801258619413212782208M2420515098224160152142508M242202001272842102032731012M242552501463412662544237012M272853001814013103055443016M273253501844583553508649016M3034040019151540540012055016M3336045020356545545014860020M3337550021962250550016566020M3339560022273260560034077020M3641070030583170069540087524M3950080030594280079658099024M455209003681040903898660109028M455901000432115510551050960121028M5267512005241365120512001440142032M52790公称 压力 PN MPa公称通径 DN mm尺寸(mm)重 量 (㎏)配管法兰(供参考)LDD3D2螺栓孔中心 圆直径D1螺栓 数量螺栓 直径d螺栓长度L1RF、MFMRJPN 1.6MPa5060108585131254M16150-6567128736541458M16160-8073142888061608M16170-1007316810810581908M20180-12586194132127132208M24205-15098224160152162508M24220-2001272912102032832012M27270-2501463532662544938512M30300-3001814183103057645016M30345-35022247535535011451016M33400-40023254740540019058516M36425-45026457245545020061020M36470-50029262650550026067020M39505-60031874560860040479520M45575-PN 6.3MPa5060114585141354M201701856567138736551608M201801958073148888071708M2019020510079174108102102008M24210225125105211132127162408M27250265150136248162152202808M302903052001653102122003834512M333353502502133622662506240012M3339541030022942231030510046016M3342043535027348735535016052516M3648049540030554140540026058516M39525540PN 10.0 MPa5060120585151454M241822006567144736571708M2419521080731548880101808M2420522010079181108102122108M27225240125105218132127192508M302652801501362581621522529012M303053202001653242122005636012M3335537025021339226632509443012M364254403002294561230514250016M3946548035027351035535023056016M4553555040030557040540036662016M45585600公称 压力 PN MPa公称通径 DN mm尺寸(mm)重 量 (㎏)配管法兰(供参考)LDD3D2螺栓孔中心 圆直径D1螺栓 数量螺栓 直径d螺栓长度L1RF、MFMRJPN 16.0 Mpa (JB/T 74-90)5070142565181658M2220522065831627365111908M2724526080831769080162058M27250265100102208108102192408M30280295125110247136127332858M363353501501592801621504031812M363854052002063562122038440012M4247049025024143526625014648512M4853555530029252031230523057016M48610640PN 16.0 Mpa (GB/T 9112～9124、HG20592 ～20614)5070120565171454M2421022565831447365101708M2423525080831549080141808M24245260100102181108102172108M27280295125110218136127282508M303053201501592581621523629012M303653952002063252122037836012M3342544525024138926625413043012M3949551530029245931230521050016M39570600PN 20.0 Mpa (HG20592 ～20614)5070136565181608M2221523065831747365162038M2725527080831989080222308M30270285100102254108102352928M363303451251102801361275031812M363553751501593161621527836012M4243045020020639021220312044012M4851053025024851826625422057216M52595625PN 25.0 Mpa (HG20592 ～20614)5070124565181508M2421523065831547365141808M2423525080831719080202008M27250265100102203108102282358M302903051251102431361274427512M303103251501592851621527032012M3338540520020635921220311040012M3947049025024844326625420049016M4556058030030554031230535059016M48665695注：1、不同的法兰标准其尺寸有一定的差异，故配管法兰的螺栓直径d、螺栓长度L，等尺寸仅供参考。本表中配管法兰尺寸主要以JB/T74-90标准系列2为依据。2、RF表示凸面法兰；MFM表示凹面法兰；RJ表示环