真空闸阀的用途该阀门适用于工作温度≤425℃（铬钼钢材NKZ44Y型为≤550℃），工作介质为水、蒸汽或空气的管路上，作为启闭装置；尤其适用于火电厂汽机冷凝和真空负压系统，起真空隔离密封作用。真空闸阀由普通手动闸阀改进而来，区别在于真空闸阀的填料密封处多加装一个真空密封环，具有自胀压紧作用。比普通闸阀的气密封性能更好。真空闸阀的启闭件是闸板，闸板的运动方向与流体方向相垂直，闸阀只能作全开和全关,不能作调节和节流。国内主要的知名厂商有上海高压阀门厂（集团）有限公司。其公司是机械工业部、化工部、中国化工装备总公司定点管理生产企业。其产品在业内有一定的价格优势和技术优势。闸板有两个密封面,***常用的模式闸板阀的两个密封面形成楔形、楔形角随阀门参数而异,通常为50,介质温度不高时为2°52'。楔式闸阀的闸板可以做成一个整体，叫做刚性闸板；也可以做成能产生微量变形的闸板,以改善其工艺性,弥补密封面角度在加工过程中产生的偏差,这种闸板叫做弹性闸板。此阀一般水平安装。特点：1、流体阻力小,密封面受介质的忡刷和侵蚀小。2、开闭较省力。3、介质流向不受限制,不扰流、不降低压力。4、形体简单,结构长度短，制造工艺性好，适用范围广。5、密封面之间易引起冲蚀和擦伤，维修比较困难。6、外形尺寸较大，开启需要一定的空间，开闭时间长。7、结构较复杂。8、真空闸阀的种类,按密封面配置可分为楔式闸板式闸阀和平行闸板式闸阀,楔式闸板式闸阀又可分为:单闸极式、双闸板式和弹性闸板式；平行闸板式闸阀可分为单闸板式和双闸板式。按阀杆的螺纹位置划分，可分为明杆闸阀和暗杆闸阀两种。试验压力公称压力PN/MPaNominalpressure试验压力/MPaSealtest壳体强度试验Shellstrength上密封试验Backsealtest密封试验Seattest1.01.51.11.11.62.41.81.82.53.82.82.84.06.O4.44.46.48.67.O7.01O.O15.O11.O11.O使用范围产品类型Producttype适用介质Applicablemedium适用温度/℃ApplicabletemperatureNKZ41HNKZ44HNKZ944H-C型NKZ941H水、蒸汽、空气Water，Steam，Air≤425NKZ41H(Y)NKZ44H(Y)-I型NKZ944H(Y)-I型NKZ941H(Y)水、蒸汽、空气Water，Steam，Air≤550主要零件材料零件名称Partname阀体、阀盖BodyBonnet阀杆Stem闸板Wedgegate密封面Sealingface阀杆螺母Yokenut填料Parking紧固件FastenerNKZ44HNKZ41H-C型NKZ944H-C型NKZ941HWCB2Crl325H：合金钢H：alloysteel铝青铜Albronze膨胀复合石墨ExpandingcomDoundgraphite优质碳钢High-gradecarb***teelNKZ44NKZ41Y-I型NKZ944-I型NKZ941铬钼钢Cr.Mosteel20CrlMo1VA38CrMoAlA铬钼钢Cr.MosteelY：硬质合金Y：carbidealloy铬钼钢Cr.Mosteel主要尺寸公称通径DN/mmNominaldiameter公称压力PN/MPaNominalpressure主要外形尺寸和连接尺寸/mmMainextemalandconnectingdimensi***阀门重量/kgValveweight附法兰尺寸/mmAdditionalflange'sdimensi***LHDD1D2bfz-dWhD0Dn501.O2503451601251OO1634-1825028454958652703951801451201834-1825040486475802804251951601352034-183005550789710030051O2151801552038-1830072529611012532557024521O1852238-183501066012013615035072528024021O2438-18350146601451632004008203352952652638-184002206220222325045089039035032028312-2340031562225278300500107044040036828312-2345039865303330350550132050046042830416-2355053065351382400600145056551548232416-2555069065398432450650156061556553232420-2560087070460485500700172067062058534420-25650108078500535600800188078072568536520-30700135090600636700900208589584080040524-307501950906907268001OOO2590101O95090544524-348002500106790826501.62503451601251OO1634-1825028484958652703951801451201834-1825040506475802804251951601352038-183005852789110030051O2151801552038-1830075529611012532557024521O1852238-183501106012013615035072528024021O2438-233501506014516320040082033529526526312-234002236220122325045089040535532030312-2545032668253278300500107046041O37530312-2555043270303330350550132052047043534416-2560057278351382400600145058052548536416-3065074090398432450650156064058554540420-3070095595450485500700172070565060844420-34750119598500535600800188084077071848520-4180014551056006367009002085g1O84078850524-41850211O11O6907268001OOO2590102095089852524-419502630115790826公称通径DN/mmNominaldiameter公称压力PN/MPaNominalpressure主要外形尺寸和连接尺寸/mmMainexternalandconnectingdimensi***阀门重量/kgValveweight附法兰尺寸/mmAdditionalflange'sdimensi***LHDD1D2bfZ-dWhDODn502.52503451601251002034-1825030484964652703951801451202238-1825043526682802804251951601352238-18300605578951OO3005102301901602438-2330079621001171253255702702201882838-25350114681251441503507253002502183038-253501577215117220040082036031027834312-254002436020122325045089042537033236312-3045034585253278300500107048343039040416-305504559230333035055013205504g044844416-3465061598351382400145061055050548416-347007g4115398432450650156066060055550420-347501018115450483500700172073066061O52420-418001250120498535600800188084077071856520-418501528130598636700900208595587581560524-48900226514068872680010002590107099093064524-4810002847150788826公称通径DN/mmNominaldi8m8ter公称压力PN/MPaNominalpressure主要外形尺寸和连接尺寸/mmMainexternalandconnectingdimensi***阀门重量/kgValveweight附法兰尺寸/mmAdditionalflange'sdimensi***LHDD1D2bfD6f2z-dWhDODn504.02503451601251002038844-18300354848646527039518014512022311O48-18300495266828028042519516013522312148-18350655878951003005102301901602431504.58-2335087681001171253255702702201882831764.58-25400124681251441503507253002502183032044.58-25400172721511722004008203753202823832604.512-304502758819g2232504508904453853454233134.512-34550392102251278300500107051O4504084643644.516-346505151163013303505501320570510465524422516-3475068412034g3824006001450655585535584474516-41850902142396432)