Butterflyvalves蝶閥蝶閥的工作原理Theworkingprincipleofbutterflyvalve蝶閥的定義：Dccbutterflyvalve蝶閥是用圓形蝶板作啟閉件并隨閥桿轉(zhuǎn)動來開啟、關(guān)閉和調(diào)節(jié)流體通道的一種閥門。蝶閥的蝶板安裝于管道的直徑方向。Thebutterflyvalveisavalvethatusesaroundbutterflyplateastheopeningandclosingmemberandrotateswiththestemtoopen,closeandregulatethefluidpassage.Thebutterflyplateofabutterflyvalveisinstalledinthedirectionofthediameterofthepipe.在蝶閥閥體圓柱形通道內(nèi)，圓形蝶板繞著軸線旋轉(zhuǎn)，旋轉(zhuǎn)角度為0°～90°之間，旋轉(zhuǎn)到90°時，閥門則呈全開狀態(tài)。Inthecylindricalchannelofthebutterflyvalvebody,thecircularbutterflyplaterotatesaroundtheaxis,therotationangleisbetween0°and90°,andwhenitrotatesto90°,thevalveisfullyopen.蝶閥的分類Classificationofbutterflyvalves1)按閥板形式Accordingtotheformofvalveplate按閥板形式蝶閥可分為中心對稱板、偏置板、斜置板，如圖所示。AccordingtoAccordingtotheformofthevalveplatebutterflyvalvecanbedividedintocenter-symmetricalplate,offsetplate,obliqueplate,asshowninthefigure.蝶閥的分類Classificationofbutterflyvalves2）按密封形式Bysealingform圖為軟密封型蝶閥thesoftsealtypebutterflyvalve圖為硬密封型蝶閥thehardsealtypebutterflyvalve可分為軟密封型和硬密封型兩種。軟密封型一般采用橡膠環(huán)密封，硬密封型通常采用金屬環(huán)密封。Itcanbedividedintotwotypes:softsealtypeandhardsealtype.Softsealtypegenerallyusesrubberringseal,andhardsealtypeusuallyusesmetalringseal.蝶閥的分類Classificationofbutterflyvalves

有對夾式蝶閥、法蘭式蝶閥、對焊式蝶閥三種。

Therearethreekindsofbutterflyvalves,namely,theclamptypebutterflyvalve,theflangetypebutterflyvalveandthebutt-weldingtypebutterflyvalve.對夾式蝶閥是用雙頭螺栓將閥門連接在兩管道法蘭之間；

Clamp-onbutterflyvalveisadouble-headedboltthatconnectsthevalvebetweentwopipeflanges法蘭式蝶閥是閥門上帶有法蘭，用螺栓將閥門上兩端法蘭連接在管道法蘭上；

Flangedbutterflyvalvesarevalveswithflangesonthem,withboltsconnectingtheflangesonbothendsofthevalvetothepipeflange.對焊式蝶閥的兩端面與管道焊接連接。

Butt-weldedbutterflyvalveshavetwoendfacesweldedtothepipe.圖為對夾式蝶閥thebuttressbutterflyvalve圖為法蘭式蝶閥flangetypebutterflyvalve圖為對焊式蝶閥butt-weldbutterflyvalve3）按連接形式Byconnectionform蝶閥的結(jié)構(gòu)特點Structuralcharacteristicsofbutterflyvalves01

結(jié)構(gòu)簡單、體積小、重量輕、材料耗用省，安裝尺寸小，開關(guān)迅速、90°往復回轉(zhuǎn)，驅(qū)動力矩小等特點。

Simplestructure,smallvolume,lightweight,materialconsumption,smallinstallationsize,rapidswitching,90°reciprocatingrotation,smalldrivingtorque,etc.02

用于截斷、接通、調(diào)節(jié)管路中的介質(zhì)，具有良好的流體控制特性和關(guān)閉密封性能。Itisusedtocutoff,connectandregulatethemediuminthepipeline,withgoodfluidcontrolcharacteristicsandclosingsealingperformance.03

蝶閥處于完全開啟位置時，蝶板厚度是介質(zhì)流經(jīng)閥體時唯一的阻力，因此通過閥門所產(chǎn)生的壓力降小，具有較好的流量控制特性。

Whenthebutterflyvalveisinthefullyopenposition,thethicknessofthebutterflyplateistheonlyresistancewhenthemediumflowsthroughthevalvebody,sothepressuredropgeneratedthroughthevalveissmallandhasbetterflowcontrolcharacteristics.蝶閥的結(jié)構(gòu)特點Structuralcharacteristicsofbutterflyvalves蝶閥的缺點如下：

Thedisadvantagesofbutterflyvalvesareasfollows:（1）使用壓力和工作溫度范圍小；

Smalloperatingpressureandtemperaturerange;（2）密封性較差。Poorsealing.

蝶閥的優(yōu)點如下：

Theadvantagesofbutterflyvalvesareasfollows:（1）啟閉方便迅速、省力、流體阻力小；Easytoopenandclosequickly,labor-saving,lowfluidresistance;（2）結(jié)構(gòu)簡單，體積小，重量輕；Simplestructure,smallvolume,lightweight;（3）調(diào)節(jié)性能好，低壓下可以實現(xiàn)良好的密封。

Goodadjustmentperformance,lowpressurecanachieveagoodseal.蝶閥的結(jié)構(gòu)特點Structuralcharacteristicsofbutterflyvalves01蝶閥的結(jié)構(gòu)長度和總體高度較小，開啟和關(guān)閉速度快。Thebutterflyvalvehasasmallstructurallengthandoverallheight,andopensandclosesquickly.03當開啟到15°～70°之間時，又能進行靈敏的流量控制Whenopenedtobetween15°and70°,sensitiveflowcontrolisagainpossible04

如果要求蝶閥作為流量控制使用，應正確選擇閥門的尺寸和類型。Ifabutterflyvalveisrequiredforuseasaflowcontrol,thecorrectsizeandtypeofvalveshouldbeselected.02在完全開啟時，具有較小的流體阻力，Withlessfluidresistancewhenfullyopened蝶閥的選用Butterflyvalveselection蝶閥不僅在石油、煤氣、化工、水處理、熱電站冷卻水系統(tǒng)等一般工業(yè)上得到廣泛應用，蝶閥的結(jié)構(gòu)原理也適合于制造大口徑閥門。Butterflyvalvesarenotonlywidelyusedingeneralindustriessuchaspetroleum,gas,chemical,watertreatment,thermalpowerstationcoolingwatersystem,etc.Thestructureprincipleofbutterflyvalvesisalsosuitableformanufacturinglargediametervalves.蝶閥的選用Butterflyvalveselection（1）要求節(jié)流、調(diào)節(jié)控制流量；Requirementforthrottlingandregulatingcontrolledflow.（2）泥漿介質(zhì)及含固體顆粒介質(zhì)；Slurrymediaandmediacontainingsolidparticles.（3）要求閥門結(jié)構(gòu)長度短的場合；

Occasionsrequiringshortlengthofvalvestructure.（4）要求啟閉速度快的場合；Occasionsrequiringfastopeningandclosingspeeds.（5）壓差較小的場合。Theoccasionofsmallpressuredifference.在下列工況條件下，推薦選用蝶閥：Butterflyvalvesarerecommendedunderthefollowingworkingconditions.蝶閥安裝與維護Butterflyvalveinstallationandmaintenance（1）在安裝時，閥瓣要停在關(guān)閉的位置上；Thevalveflapistobestoppedintheclosedpositionatthetimeofinstallation.（2）開啟位置按蝶板旋轉(zhuǎn)角度來確定；Theopeningpositionisdeterminedbytherotationangleofthebutterflyplate.（3）帶有旁通閥的蝶閥，開啟前應先打開旁通閥；Butterflyvalveswithbypassvalves,whichshouldbe