Kwihlabathi lolawulo lolwelo, apho ukuchaneka nokuthembeka kubaluleke kakhulu, isihlalo sevalvu yeyona nto ibalulekileyo. Eli candelo libalulekileyo sisiseko sokusebenza kwevalvu yokutywina, nto leyo echaphazela ngokuthe ngqo ukuthembeka kwayo okungavuziyo, ubomi benkonzo, kunye nokhuseleko ngokubanzi. Nokuba ungunjineli, ingcali yokulungisa, okanye ingcali yokuthenga, ukuqondaIsihlalo seValvekubalulekile ekusebenzeni kakuhle kwenkqubo.
Yintoni iSihlalo seValve?
Isihlalo sevalvu sisixhobo esingundoqo sangaphakathi sevalvu esenza isiqingatha sesibini sokutywina. Ngumphezulu ongashukumiyo apho into yokuvala ivalvu—njengesihlalo sevalvu yebhola idibana khona nebhola, okanye isihlalo sevalvu yeglobe eneplagi—idibanisa ulwelo ukuze iyeke ukuhamba kwamanzi.
Cinga ngayo “njengesitulo” esilungisiweyo ngokuchanekileyo senxalenye eshukumayo. Xa ivalvu ivaliwe, into yokuvala ihlala ngokuqinileyo kwisihlalo sevalvu, idala isitywino esahlula icala elingasentla kwicala elingasentla. Umgangatho wale interface ulawula udidi lokuvuza kwevalvu kunye nokukwazi kwayo ukubamba uxinzelelo.
Imisebenzi Ebalulekileyo Yesihlalo Sevalvu
Isihlalo sevalvu siyinxalenye enamakhono amaninzi, esenza imisebenzi emininzi ebalulekileyo:
1. Ukutywinwa okuPhambili:Umsebenzi wayo ophambili kukudala isitywino esingavuziyo esinesithako sokuvala, ukuthintela ulwelo ukuba lungadluli xa ivalvu ikwindawo evaliweyo.
2. Ukuxhasa iCandelo lokuVala:Isihlalo sevalvu sinamandla asetyenziswa yinto yokuvala kunye noxinzelelo lwenkqubo, nto leyo enika inkxaso ezinzileyo xa ivalvu ivaliwe.
3. Isikhokelo kunye noLungelelaniso:Kwiintlobo ezithile zeevalvu ezifana neGlobe Valve Seats, isihlalo sihlala sinceda ukukhokela iplagi okanye idiski, siqinisekisa ukulungelelaniswa okugqibeleleyo kwetywina elifanayo nelisebenzayo ngalo lonke ixesha.
4. Inxalenye Edibeneyo Yomda Woxinzelelo:Isihlalo siyinxalenye ebalulekileyo yomzimba wevalvu oqulathe uxinzelelo, esifuna amandla amakhulu kunye nozinzo, ingakumbi xa kusetyenziswe uxinzelelo oluphezulu.
Izixhobo zeSihlalo seValve: Ukukhetha iFanelo eLungileyo
Ukukhetha izixhobo ezifanelekileyo zesihlalo sevalvu kukulinganisa phakathi kokuhambelana kweekhemikhali, ubushushu, uxinzelelo, ukumelana nokuguguleka, kunye nexabiso. Olu khetho luchaza ngokusisiseko uluhlu lwesicelo sevalvu.
Izihlalo ezithambileyo (iPolymeric):
• I-PTFE (iTeflon):Inika ukumelana okugqwesileyo kweekhemikhali, i-coefficient ephantsi kakhulu yokungqubana, kunye nobubanzi bobushushu obubanzi. Lukhetho olufanelekileyo kwiinkonzo zokubola kunye nezicelo ezifuna ukuvalwa okuqinileyo.
• I-NBR (Irabha yeNitrile):Inika ukumelana okuhle kakhulu neeoyile kunye namafutha, nto leyo eyenza ukuba ixhaphake kakhulu kwi-petroleum, emanzini, nasemoyeni.
• I-EPDM (i-Ethylene Propylene Diene Monomer):Yaziwa ngemozulu egqwesileyo, i-ozone, kunye nokumelana nomphunga, ifanelekile kumanzi ashushu, iinkqubo zokupholisa, kunye neekhemikhali ezahlukeneyo.
•IiSilikoni zeSeal:Inika ukumelana okuhle kakhulu nobushushu, iikhemikhali, kunye nokukhula kweentsholongwane. Zisetyenziswa kakhulu kwiindawo eziqala kwi -100°C ukuya kwi +316°C (-148°F ukuya kwi +600°F)
Izihlalo zesinyithi:
• Intsimbi Engagqwaliyo (304, 316):Ukhetho olusebenziseka lula nolunokumelana nokugqwala kwamanzi, umphunga, ioyile, kunye neekhemikhali ezininzi.
• Intsimbi ye-Alloy (13Cr, 17-4PH):Isetyenziselwa ukomelela nokuqina okuphuculweyo kwiindawo ezinoxinzelelo oluphezulu kunye nobushushu obuphezulu.
• Intsimbi Engagqwaliyo Ephindwe Kabini:Idibanisa amandla aphezulu kunye nokumelana nokugqwala okuphezulu, ingakumbi xa i-chloride ibangela uxinzelelo lokugqwala.
• Ii-Alloys ezikhethekileyo (iMonel, iHastelloy):Isetyenziselwe iinkonzo ezitshisa kakhulu, ezinje ngamanzi olwandle, i-hydrofluoric acid, okanye i-hot sulfuric acid.
• Ii-Alloys ezisekelwe kwiCobalt (iStellite):Isetyenziswa njengesixhobo esiqinileyo kumphezulu wesihlalo ukubonelela ngokuguguleka okukhulu kunye nokumelana nokukhukuliseka.
Urhwebo oluPhambili:Izihlalo ezithambileyo zihlala zitywinwa ngendlela yokuba zingabi namabhamuza kodwa zinomlinganiselo olinganiselweyo wobushushu kunye noxinzelelo. Izihlalo zesinyithi zimelana neemeko ezinzima, ezinobushushu obuphezulu/uxinzelelo kodwa ukufezekisa ukungavuzisi kunokuba nzima ngakumbi.
Imida yoBushushu beSihlalo seValve
Ubuchule besihlalo bokumelana nobushushu buxhomekeke kwizinto ezisetyenziswa kuso.
•Izihlalo ezithambileyo:Ngokwesiqhelo isebenza ngaphakathi kwebhanti yobushushu obuphakathi. I-EPDM idla ngokukhawulelwa kwi ~150°C, i-NBR ukuya kwi ~80°C, ngelixa i-PTFE inokumelana ukuya kuthi ga kwi ~260°C. Ngaphaya kwezi ngongoma, iipolymers ziyawohloka, ziqine, okanye zitshintshe ngokusisigxina, nto leyo ebangela ukungaphumeleli kwetywina.
•Izihlalo zesinyithi:Zenzelwe inkonzo yobushushu obuphezulu, ezikwaziyo ukusebenza ukusuka kumaqondo obushushu acacileyo ukuya kutsho kuma-800°C, kuxhomekeke kwi-alloy. Izinto kufuneka zigcine amandla azo kwaye zimelane ne-oxidation kunye nokurhubuluza kwezi meko zinzima.
Uvavanyo loxinzelelo lweSihlalo seValve
Isihlalo sevalvu kufuneka simelane noxinzelelo lokusebenza kwenkqubo ngaphandle kokuguquka okanye ukungaphumeleli.
• Iinkqubo zoxinzelelo oluphantsi: Zombini izihlalo zesinyithi ezithambileyo nezisemgangathweni zifanelekile.
• Iinkqubo zoxinzelelo oluphakathi ukuya koluphezulu: Kufuneka izihlalo zentsimbi eziqinileyo. Uyilo, olufana nokusebenzisa izitulo ezingasemva okanye izakhiwo eziqinisiweyo, luba lubaluleke kakhulu ukuthintela ukuqhekeka kwezihlalo.
• Iinkqubo zoxinzelelo oluphezulu kakhulu: Funa izihlalo zesinyithi ezenziwe ngokukodwa, ezidla ngokuba zii-alloys ezinamandla aphezulu, ezinemiphetho echanekileyo kakhulu yomphezulu ukuthintela ukuba i-media ingafakwa kwiziphene zomphezulu ezincinci.
Kubalulekile ukukhumbula ukuba amazinga obushushu kunye noxinzelelo axhomekeke kwelinye; ubushushu obuphezulu bunciphisa amandla ento.
Izakhiwo zeSihlalo seValve kwiintlobo ezahlukeneyo zeValve
Uyilo kunye nokusebenza kwesihlalo sevalvu kuyahluka kakhulu ngokuxhomekeke kuhlobo lwevalvu. Nantsi ingqwalasela yezinye zezona zinto zixhaphakileyo.
Isihlalo seValve yeBhola
IIsihlalo seValve yeBholayidiski emile okwesangqa, edla ngokuba mibini, egcinwe emzimbeni wevalvu kumacala omabini ebhola.
• Ulwakhiwo: Idla ngokuba “idada,” apho uxinzelelo lwenkqubo okanye amandla entwasahlobo atyhala isihlalo nxamnye nebhola ukuze kwenziwe isitywino. Olu yilo lunokubonelela ngokutywinwa okumacala mabini okanye okumacala omabini.
•Indlela Yokuvala: Zombini izihlalo ezithambileyo nezesinyithi zisetyenziswa kakhulu. Kwizakhiwo ezikhuselekileyo emlilweni, isihlalo esithambileyo siya kutsha emlilweni, nto leyo evumela ukuba kubekho isitywino sesibini sentsimbi nesinyithi phakathi kwebhola kunye nesihlalo sesibini.
Isihlalo seValve yeGlobe
Isihlalo seGlobe Valve sihlala sisindandatho esingashukumiyo, esidityaniswe emzimbeni wevalvu, apho iplagi okanye idiski ivaleka khona.
•Ulwakhiwo: Isihlalo sihlala sisindandatho esahlukileyo, esihlaziyekayo esifakwe imisonto, sicinezelwe, okanye sidityaniswe emzimbeni wevalvu. Oku kwenza kube lula ukugcinwa nokutshintshwa.
•Indlela yokutywina: Ngokwesiqhelo kubandakanya ukudibana kweplagi ethe tyaba okanye ekhonkrithi enesihlalo esihambelanayo. Ukudibanisa izinto kungahluka ukusuka kwiintsimbi ezithambileyo ukuya kweziqinileyo, okubonelela ngezakhono ezibalaseleyo zokubhoboza nokutywina.
Isihlalo seValve yeButterfly
AIsihlalo seValve yeButterflyyindandatho ejikelezayo eqhubekayo ehambelana nobubanzi bangaphakathi bomzimba wevalvu.
•Ulwakhiwo: Idiski ijikeleza ikota-turn ngaphakathi kwesi sihlalo. Isihlalo sinokuba yiringi ecinezelweyo, ebotshelelwe (evulcanized) emzimbeni, okanye uyilo olugcinwe ngokupheleleyo, olunokutshintshwa.
•Indlela Yokuvala: Izihlalo ezithambileyo (EPDM, PTFE) zezona zixhaphakileyo, apho umjikelezo wediski ucinezeleka kwisihlalo esiqinileyo. Iivalvu zebhabhathane ezihlala ngentsimbi zisebenzisa iindawo zoqhagamshelwano ezintsonkothileyo ukuze zivale ngokuqinileyo xa kushushu kakhulu.
Ezinye izakhiwo zeSihlalo seValve ezibalulekileyo
•Isihlalo seValve yokujonga: Isebenza ngendlela efanayo nesihlalo sevalvu yeglobe, eyenzelwe ukusebenza ngokuzenzekelayo. Idiski (okanye i-wafer) iyavala isihlalo ukuthintela ukuphuma kwamanzi, ifuna impendulo ekhawulezileyo kunye nokuvalwa okuqinileyo.
•Isihlalo seValve yeSango: Ngokwesiqhelo iqulathe iiringi ezimbini ezihambelanayo, ezingashukumiyo emzimbeni wevalvu. Isango lidibanisa phakathi kwazo. Izihlalo zihlala ziyinxalenye yomzimba okanye zifakwe i-welded ukuze ziqine kwiinkonzo zokwahlukanisa ezinoxinzelelo oluphezulu.
•Isihlalo seValve yePlug: Kwivalvu yeplagi ethanjiswe ngamanzi, ukutywinwa kwenziwa ngokufaka i-sealant phakathi kweplagi nomzimba. Kwinguqulelo engathanjiswe ngamanzi, i-sleeve eyenziwe nge-PTFE okanye izinto ezifanayo isebenza njengesihlalo sevalvu esiqinileyo.
Isiphelo
Ukususela kwimpompo ethobekileyo ukuya kwizityalo zoshishino ezintsonkothileyo kwimizi-mveliso yamakhemikhali, umbane, kunye neenqwelo-moya, isihlalo sevalvu sisisiseko sokuthembeka kwenkqubo yolawulo lolwelo. Ngokuqwalasela ngononophelo izinto zayo, uyilo, kunye nemida yokusebenza, unokuqinisekisa ukhuseleko, ukusebenza kakuhle, kunye nobude bexesha leenkqubo zakho zokuphatha ulwelo.
Ixesha leposi: Okthobha-29-2025