Xa kuthelekiswa neivalvu yesango, ivalvu yeglobe kunye noyilo lwevalvu yokujonga, imbali yevalvu yebhola imfutshane kakhulu. Nangona ilungelo lobunikazi lokuqala levalvu yebhola lakhutshwa ngo-1871, kuya kuthatha iminyaka engama-85 ukuba ivalvu yebhola iphumelele kurhwebo. I-Polytetrafluoroethylene (PTFE, okanye "iTeflon") yafunyanwa ngexesha lenkqubo yokuyila ibhombu yeathomu ngexesha leMfazwe Yehlabathi yesiBini, eya kuba sisixhobo sokuqala ishishini levalvu yebhola. Iivalvu zebhola ziyafumaneka kuzo zonke izinto ukusuka kwibronze ukuya kwintsimbi yekhabhoni kunye nentsimbi engatyiwayo ukuya kwi-zirconium.

Kukho iintlobo ezimbini ezisisiseko: iibhola ezidadayo kunye neebhola ze-trunnion. Ezi zakhiwo zimbini zivumela ukwakhiwa kweevalvu zebhola ezisebenzayo ukusuka kwi-¼” ukuya kwi-60” nangaphezulu. Ngokubanzi, uyilo oludadayo lusetyenziselwa iivalvu ezincinci neziphantsi koxinzelelo, ngelixa uhlobo lwe-trunnion lusetyenziselwa ukusetyenziswa kweevalvu ezinkulu neziphezulu zoxinzelelo.

I-VM SUM21 BALL API 6Divalvu yebholaIvalvu yebhola ye-API 6D isebenzisa ezi ntlobo zimbini zeevalvu zebhola ngenxa yeendlela zazo zokutywina kunye nendlela amandla olwelo ahamba ngayo ukusuka kumbhobho ukuya ebholeni aze asasazeke kwisihlalo sevalvu. Kuyilo lwebhola edadayo, ibhola ingena kakuhle phakathi kwezihlalo ezibini, esinye phezulu kunye nesinye phantsi. Amandla olwelo asebenza ebholeni, ayityhalele kwisihlalo sevalvu esikwi-valve yomzimba we-downstream. Ekubeni ibhola igubungela umngxuma wonke wokuhamba, onke amandla akwi-flow atyhalela ibhola ukuze ayinyanzele kwisihlalo sevalvu. Ukuba ibhola inkulu kakhulu kwaye uxinzelelo lukhulu kakhulu, amandla kwisihlalo sevalvu aya kuba makhulu, kuba i-torque yokusebenza inkulu kakhulu kwaye ivalvu ayinakusebenza.

Iivalvu zebhola ezidadayo zineentlobo ngeentlobo zomzimba, kodwa ezona zidumileyo luhlobo lokungena oluneziqwenga ezimbini. Ezinye iintlobo zomzimba ziquka ukungena okuneziqwenga ezintathu kunye nokungena okuphezulu. Iivalvu zebhola ezidadayo zenziwe ngobukhulu obufikelela kwi-24″ kunye ne-300 grades, kodwa uluhlu lokusetyenziswa kweevalvu zebhola ezidadayo ludla ngokuba luphantsi kakhulu - ubuninzi bumalunga ne-12″.

Nangona iivalvu zebhola zenzelwe ikakhulu njengeevalvu zokuvula/zokucima okanye "zokumisa", ukongezwa kwezinye iivalvu zebhola kunye ne-V-portivalvu yebholauyilo lubenza babe zilungele ukusetyenziswa okulawulwayo.

Isihlalo esithambileyo
Ivalvu yeBhola yeVM SUM21 Flanged Valve Ivalvu yeBhola yeFlanged Iivalvu zebhola ezincinci ezidadayo zingasetyenziswa kwiindlela ezahlukeneyo, ukusuka kwiipayipi zasekhaya ukuya kwiipayipi eziqulethe iikhemikhali ezifuna kakhulu. Izinto ezisetyenziswa kakhulu kwezi valve luhlobo oluthile lwe-thermoplastic, njenge-PTFE. Izitulo zevalvu zeTeflon zisebenza kakuhle kuba zithambile ngokwaneleyo ukuba zivale kakuhle kwiibhola zesinyithi ezikhazimlisiweyo, kodwa zomelele ngokwaneleyo ukuba zingaphumi kwivalvu. Iingxaki ezimbini eziphambili ngezi valve zesihlalo ezithambileyo kukuba zikrweleka lula (kwaye zinokuvuza), kwaye ubushushu bulinganiselwe ngaphantsi kweqondo lokunyibilika kwesihlalo se-thermoplastic-malunga ne-450oF (232oC), kuxhomekeke kwizinto zesihlalo.

Uphawu lweevalvu ezininzi zebhola ezidadayo zesihlalo se-elastic kukuba zinokuvalwa ngokufanelekileyo xa kukho umlilo obangela ukuba isihlalo esiphambili sinyibilike. Oku kubizwa ngokuba yidizayini engatshiyo; inepokotho yesihlalo engagcini nje ngokubamba isihlalo se-elastic endaweni yaso, kodwa ikwabonelela ngomphezulu wesihlalo sesinyithi obonelela ngotywino oluncinci xa ludibana nebhola. Ngokwemigangatho yovavanyo lomlilo ye-American Petroleum Institute (API) 607 okanye 6FA, ivalvu iyavavanywa ukuqinisekisa uyilo lokhuseleko lomlilo.

Uyilo lweTrunnion
I-VM SUM21 BALL API 6D trunnion ball valve API 6D trunnion ball valve Xa kufuneka ivalvu enkulu kunye ne-pressure ball valve ephezulu, uyilo lujika luye kuhlobo lwe-trunnion. Umahluko phakathi kwe-trunnion kunye nohlobo lwe-floating kukuba ibhola ye-trunnion iqiniswe emzimbeni oyintloko yi-trunnion esezantsi (intonga emfutshane yokudibanisa) kunye ne-top rod. Ekubeni ibhola ingenakukwazi "ukudada" kwisihlalo se-valve ukuze ifikelele ekuvalekeni okunyanzelekileyo, isihlalo se-valve kufuneka sidada kwibhola. Uyilo lwesihlalo se-trunnion lubangela ukuba isihlalo sikhuthazwe luxinzelelo oluphezulu kwaye sinyanzeliswe kwi-sphere ukuze sivalwe. Ngenxa yokuba ibhola iqinile endaweni yayo, ngaphandle kokujikeleza kwayo kwe-90o, amandla angaqhelekanga olwelo kunye noxinzelelo aluyi kuyixina ibhola kwisihlalo se-valve. Endaweni yoko, amandla asebenza kuphela kwindawo encinci engaphandle kwesihlalo esidadayo.

Uyilo lwe-VM SUM21 BALL End inlet Ivalvu yebhola yetrunnion yoyilo lwe-end inlet ngumzalwana omkhulu onamandla wevalvu yebhola edadayo, ngoko ke inokusingatha imisebenzi emikhulu - uxinzelelo oluphezulu kunye nobubanzi obukhulu bepayipi. Okwangoku, ukusetyenziswa okudumileyo kweevalvu zetrunnion ball kukwiinkonzo zombhobho.