Iivalvu zeglobeIbisoloko iyindlela ephambili kulawulo lolwelo kangangeminyaka engama-200 kwaye ngoku ifumaneka kuyo yonke indawo. Nangona kunjalo, kwezinye iinkqubo, uyilo lweevalvu zeglobe lungasetyenziswa ukulawula ukuvalwa ngokupheleleyo kolwelo. Iivalvu zeglobe zihlala zisetyenziselwa ukulawula ukuhamba kolwelo. Ivalvu yeglobe ivuliwe/ivaliwe kwaye isetyenziswa ngendlela eguquliweyo inokubonwa ngaphandle kwezindlu kunye nezakhiwo zoshishino, apho iivalvu zihlala zifakwa khona.

Umphunga namanzi zazibalulekile kwiNguquko yezeMizi-mveliso, kodwa ezi zinto zinokuba yingozi kwakufuneka zithintelwe.ivalvu yeglobhuyivalvu yokuqala efunekayo ukuze kugqitywe lo msebenzi ngokufanelekileyo. Uyilo lweevalvu zeglobe lwaluphumelele kakhulu kwaye luthandwa kakhulu kangangokuba lwakhokelela ekubeni uninzi lwabavelisi beevalvu zemveli abaphambili (uCrane, uPowell, uLunkenheimer, uChapman, kunye noJenkins) bafumane amalungelo abo okuqala obunikazi.

Iivalvu zesangozenzelwe ukusetyenziswa kwiindawo ezivulekileyo ngokupheleleyo okanye ezivaliweyo ngokupheleleyo, ngelixa iivalvu zeglobe zingasetyenziswa njengeevalvu zebloko okanye zokwahlukanisa kodwa zenzelwe ukuba zivuleke kancinci ukulawula ukuhamba kwamanzi xa zilawula. Kufuneka kusetyenziswe unonophelo kwizigqibo zoyilo xa kusetyenziswa iivalvu zeglobe kwiivalvu ezisebenza ngokwahlukanisa kunye nezivaliweyo, njengoko kunzima ukugcina itywina eliqinileyo ngokucinezela okukhulu kwidiski. Amandla olwelo aya kunceda ukufezekisa itywina elihle kwaye enze kube lula ukulitywina xa ulwelo luhamba ukusuka phezulu ukuya ezantsi.

Iivalvu zeglobe zilungele ukusetyenziswa kweevalvu zolawulo ngenxa yomsebenzi wazo wokulawula, ovumela ukulawulwa okucokisekileyo kakhulu kunye nee-positioners kunye nee-actuators ezidityaniswe nebhonethi yevalvu yeglobe kunye nesiqu. Zibalasele kwiindlela ezininzi zokulawula ulwelo kwaye kwezi zicelo zibizwa ngokuba “zii-Final Control Elements.”

indlela yokuhamba ngokungathanga ngqo

I-Globe ikwaziwa njenge-globe valve ngenxa yesimo sayo sokuqala esingqukuva, esisafihla indlela engaqhelekanga nedityanisiweyo yokuhamba kwayo. Njengoko imijelo yayo ephezulu nesezantsi irhangqiwe, i-globe valve evuleke ngokupheleleyo isabonakalisa ukungqubana okukhulu okanye umqobo ekuhambeni kolwelo ngokwahlukileyo kwi-gate okanye i-ball valve evuleke ngokupheleleyo. Ukungqubana kolwelo okubangelwa kukuhamba okuthambekileyo kuyacothisa ukuhamba kwe-valve.

I-flow coefficient, okanye "i-Cv," yevalvu isetyenziselwa ukubala ukuhamba kwayo. Iivalvu zesango zinokumelana okuncinci kakhulu nokuhamba xa zikwindawo evulekileyo, ngoko ke i-Cv iya kwahluka kakhulu kwivalvu yesango kunye nevalvu yeglobe enobukhulu obufanayo.

Idiski okanye iplagi, esebenza njengendlela yokuvala ivalvu yeglobe, inokwenziwa ibe ziintlobo ngeentlobo zeemilo. Izinga lokuhamba kwevalvu lingatshintsha kakhulu ngokusekelwe kwinani le-stem lokujikeleza xa ivalvu ivuliwe ngokutshintsha imo yediski. Uyilo lwediski olugobileyo oluqhelekileyo okanye "lwendabuko" lusetyenziswa kuninzi lwezicelo kuba lufanelekile kunezinye uyilo kwintshukumo ethile (ukujikeleza) kwesiqu sevalvu. Iidiski ze-V-port zifanelekile kuzo zonke iisayizi zeevalvu zeglobe kwaye zenzelwe ukukhawulelwa kokuhamba kakuhle kwiipesenti ezahlukeneyo zokuvula. Ulawulo lokuhamba olupheleleyo luyinjongo yeentlobo zeenaliti, nangona kunjalo zihlala zifumaneka kuphela kwiidayamitha ezincinci. I-insert ethambileyo neqinileyo inokufakwa kwidiski okanye kwisihlalo xa kufuneka ukuvala ngokupheleleyo.

I-Globe valve trim

Ukuvalwa kwento ethile kwi-globe valve kunikezelwa yi-spool. Isihlalo, idiski, isiqu, isihlalo sangasemva, kwaye ngamanye amaxesha izixhobo ezincamathisela isiqu kwidiski zenza i-trim ye-globe valve. Ukusebenza kakuhle kwe-valve kunye nobomi bayo kuxhomekeke kuyilo lwe-trim kunye nokukhethwa kwezinto, kodwa ii-globe valves zisengozini enkulu ngenxa yokuxinana kwazo okuphezulu kolwelo kunye neendlela ezintsonkothileyo zokuhamba kwamanzi. Isantya sazo kunye nokuxinana kwazo ziyanda njengoko isihlalo kunye ne-disc zisondelana. Ngenxa yendalo yokubola kolwelo kunye nesantya esonyukayo, kunokwenzeka ukuba konzakalise i-valve trim, eya kwandisa kakhulu ukuvuza kwe-valve xa ivaliwe. I-Stringing ligama le-fault ebonakala ngamanye amaxesha njengee-flakes ezincinci kwisihlalo okanye kwi-disc. Oko kwaqala njengendlela encinci yokuvuza kunokukhula kwaye kube kukuvuza okukhulu ukuba akulungiseki ngexesha elifanelekileyo.

Iplagi yevalvu kwiivalvu ezincinci zeglobe yebronze idla ngokwenziwa ngezinto ezifanayo nomzimba, okanye ngamanye amaxesha i-alloy eqinileyo efana nebronze. Eyona nto iqhelekileyo yespool kwiivalvu zeglobe yesinyithi yibronze. I-IBBM, okanye "uMzimba weNsimbi, ukuHamba ngeBronze," ligama lale trim yesinyithi. Kukho izinto ezininzi ezahlukeneyo zokuhombisa ezikhoyo kwiivalvu zesinyithi, kodwa ngokuqhelekileyo into enye okanye ezingaphezulu zenziwe ngentsimbi engagqwali yemartensitic engama-400. Ukongeza, kusetyenziswa izinto eziqinileyo ezifana ne-stellite, iintsimbi ezingagqwali ezingama-300, kunye nee-alloy ze-copper-nickel ezifana neMonel.

Kukho iindlela ezintathu ezisisiseko zeevalvu zeglobe. Imilo "ye-T", enesiqu esithe nkqo kumbhobho, yeyona iqhelekileyo.
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Njenge-T-valve, i-engile valve ijikeleza ukuhamba ngaphakathi kwi-valve ngama-90 degrees, isebenza njengesixhobo sokulawula ukuhamba kunye ne-90 degrees pipe elbow. Kwi-oyile negesi "imithi yeKrismesi," ii-angle globe valves luhlobo lwe-final output regulating valve esasetyenziswa rhoqo phezu kwee-boilers.
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Uyilo lwe-“Y”, oluyilo lwesithathu, lujoliswe ekuqiniseni uyilo lwezicelo zokuvula/ukuvala ngelixa kunciphisa ukuhamba okuguquguqukayo okwenzeka emzimbeni wevalvu yeglobhu. I-bonnet, isiqu, kunye nediski yolu hlobo lwevalvu yeglobhu zijikwe nge-engile ye-30-45 degrees ukwenza indlela yokuhamba iqonde ngakumbi kwaye kuncitshiswe ukungqubana kolwelo. Ngenxa yokungqubana okunciphileyo, ivalvu ayinakwenzeka ukuba iqhubeke nomonakalo okhukulisayo kwaye iimpawu zokuhamba kweenkqubo zemibhobho ziphucukile.