安装调节阀的问题

  仪器信息网 ·  2011-02-24 22:11  ·  6714 次点击
调节阀在使用中,很多往往不是因为调节阀本身质量所引起,而是对调节阀的安装使用不当所造成,如安装环境、安装位置及方向不当或者是管路不清洁等原因所致。因此电动调节阀在安装使用时要注意以下几方面:
(1)调节阀属于现场仪表,要求环境温度应在-25~60℃范围,相对湿度≤95%。如果是安装在露天或高温场合,应采取防水、降温措施。在有震源的地方要远离振源或增加防振措施。
(2)调节阀一般应垂直安装,特殊情况下可以倾斜,如倾斜角度很大或者阀本身自重太大时对阀应增加支承件保护。
(3)安装调节阀的管道一般不要离地面或地板太高,在管道高度大于2m时应尽量设置平台,以利于操作手轮和便于进行维修。
(4)调节阀安装前应对管路进行清洗,排除污物和焊渣。安装后,为保证不使杂质残留在阀体内,还应再次对阀门进行清洗,即通入介质时应使所有阀门开启,以免杂质卡住。在使用手轮机构后,应恢复到原来的空档位置。
(5)为了使调节阀在发生故障或维修的情况下使生产过程能继续进行,调节阀应加旁通管路。
同时还应特别注意,调节阀的安装位置是否符合工艺过程的要求。
(6)电动调节阀的电气部分安装应根据有关电气设备施工要求进行。如是隔爆型产品应按《爆炸危险场所电气设备安装规范》要求进行安装。如现场导线采用SBH型或其它六芯或八芯、外径为Φ11.3
a.两位阀:主要用于关闭或接通介质;
b.调节阀:主要用于调节系统。选阀时,需要确定调节阀的流量特性;
c.分流阀:用于分配或混合介质;
d.切断阀:通常指泄漏率小于十万分之一的阀。
对小口径的调节阀,尤其是超小流量调节阀,其节流间隙特小,介质中不能有一点点渣物。遇此情况堵塞,最好在阀前管道上安装一个过滤器,以保证介质顺利通过。带定位器使用的调节阀,定位器工作不正常,其气路节流口堵塞是最常见的故障。因此,带定位器工作时,必须处理好气源,通常采用的办法是在定位器前气源管线上安装空气过滤减压阀。
利用介质自身的冲刷能量,冲刷和带走易沉淀、易堵塞的东西,从而提高阀的防堵功能。常见的方法有:①改作流闭型使用;②采用流线型阀体;③将节流口置于冲刷最厉害处,采用此法要注意提高节流件材料的耐冲蚀能力。
Regulatorinuse,manymoreoftenthannotbecausetheregulatorcausedbyitself,butthequalityoftheregulatorcausedbyimproperinstallationanduse,suchastheinstallationenvironment,installationpositionanddirectionisnotcleanpipeimproperorbyreason,etc.Thereforetheinstallationuseshouldpayattentiontointhefollowingaspects:
(1)belongtothefieldinstruments,valvesshouldbeinenvironmentaltemperature-25~60°c,morethan95%ofrelativehumidity.Ifitisinstalledintheopenorhightemperatureshouldbetaken,waterproof,coolingmeasures.Inplaceofsourcefromsourceorincreasevibration-proofsteps.
(2)regulatorshallgenerallybeinstalledvertically,specialcircumstancescantiltAngle,suchasbigorvalveitselfwhentoomuchweightonthevalveshouldbeincreasedsupportingaprotection.
Installregulator(3)ofthepipefromthegroundfloororgeneralnottoohigh,morethan2minpipeshouldbesetwhenoperatingplatform,andfacilitatethemaintenance.
Beforeinstallingvalves(4)tocleanoutpipe,dirtandweldingslag.Afterinstallation,toensurethatnoresidueinthebodyofthevalve,alsoshouldbecleanedonceagain,namelythemediashouldmakeallthevalveopens,lestimpuritiesstuck.Afterusingthehandwheelinstitutionsinshouldberestoredtotheoriginalspacelocation.
(5)inordertomaketheregulatorinthefaultorrepairtheproductionprocesscancontinue,by-passpipevalvesshouldbeadded.
Also,theregulatorshouldpayspecialattentiontotheinstallationpositionmeetstherequirementofprocess.
(6)oftheelectricalpartsofelectricvalvesshouldbeinstalledaccordingtotherelevantelectricalequipmentconstructionrequirements.Ifflameproofproductsshallbeaccordingtotheelectricalequipmentinstallationexplosionhazardinstallationrequirementsspecification.IfSBHleadssitetypeorothersixoreightcore,outercoreforΦ11.3
A.twovalve:mainlyusedinclosedorconnectmedium,
B.regulator:mainlyusedinregulatingsystem.Choosevalve,needtodeterminetheflowcharacteristics;regulator
C.thepurgevalve:usedfordistributionormixedmedia,
D.cut-offvalveleakagerate:usuallylessthan10PPMvalve.
Theregulator,especiallyforsmallexceedsmallflowregulator,thecharacteristicsofsmallandmediumthrottlingclearancecanhaveabitofslag.Inthiscase,thebestbeforethejamonpipinginstallationofastrainer,toensuresmooththroughthemedium.Theregulatorusedwithlocator,locatordoesnotworkproperly,thegaspaththrottlingblockedisoneofthemostcommonfault.Therefore,whenworkingwithlocator,mustdealwithair,usuallybythewayisintheairpipebeforelocatorinstalledontheairfilterrelief-pressurevalve.
Usingthemediumitself,scouringandscouringenergytotakethingseasyjam,prevent,soastoimprovethevalve.Thecommonmethodis:(1)flowofadaptationanduse,2thebody,3willbeplacedthescourthrottlingmouth,usethislawshouldpayattentiontoimprovingthrottlingmaterialsofcorrosionproofability.

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