◎闸阀剖面图SectionalDrawingofGateValve◎闸阀，也叫闸板阀、闸门阀是指关闭件（闸板）沿通路中心线的垂直方向移动的阀门。用于接通或截断介质。◎Gatevalveisavalvewiththediskmovingverticalwiththecentre-axisofvalveseatwhenitworks.It'smainlyusedinconnectingandstoppingmedium.优点：1、流体阻力小2、开闭所需外力较小3、介质的流向不受限制4、全开时，密封面工作介质的冲蚀比截止阀小。Advantages:1.***allresistancewiththefluid.2.***allforceisneededwhenopenandclosethevalve.3.Unlimiteddirectionofflowmedium.4.Resistancebetweentheworkingmediumandthesealingsurfaceis***allerthanthatofstopvalve'swhenthevalveisopenedcompletely.◎闸阀应用建议Suggesti***onApplicationofGateValve1、管螺纹连接的闸阀与管端的管螺纹相连接须控制管端外长度尺寸，以免管端过量旋入以致顶压闸阀管螺纹内端面，造成阀座变形而影响密封性。2、黄铜闸阀的公称压力：1.6MPa，2.0MPa，金属密封的介质温度:-20℃~180℃。当闸阀用于饱和蒸汽时，饱和蒸汽压力≤0.6MPa。3、为延长闸阀的使用寿命，闸阀应作全开和全关使用，不宜部分开启作节流使用，因为部分开启时，流动着的介质会冲蚀密封面，从而影响密封性。4、硬密封不宜装在终端。1、IIfthegatevalvewithpipethreadconnectionisconnectedwiththepipethreadsonthepipeend,itisnecessarytocontroltheexternallengthofthepipeendinorderto***oidexcessivescrewingin,whichwillpressurizeinternalendfaceofthepipethreadsofthegatevalveandresultindeformingofthevalveseatanddamageitssealingperformance.2、NNominalpressureofbrassgatevalveis1.6MPa，2.0MPa，mediumtemperatureformetalsealis-20℃~180℃.Whenthegatevalveisusedforsaturatedsteam,thepressureofthesaturatedsteamshouldbe≤0.6MPa.3、TToincreasetheservicelifeofagatevalve,itshouldbefullyopenedorclosedinsteadofpartialopeningforthrottlingpurpose,aswhenitispartiallyopen,theflowingmediumwillerodetheballandsealingsurfaceandthusaffectthesealingperformance.4、Hardsealisunsuitabletobemountedattheterminal.)