Umzekelo wokuqala ufana neivalve yebholayivalve enelungelo elilodwa lomenzi nguJohn Warren ngo-1871. Yivalve ehleli yentsimbi enebhola yobhedu kunye nesitulo sobhedu. Ekugqibeleni uWarren wanika ipatent yakhe yoyilo lwevalve yebhola yobhedu kuJohn Chapman, intloko yeChapman Valve Company. Nokuba siyintoni na isizathu, uChapman akazange abeke uyilo lukaWarren kwimveliso. Endaweni yoko, yena kunye nabanye abavelisi bevalve bebesebenzisa uyilo oludala iminyaka emininzi.

Iivalve zebhola, ezikwabizwa ngokuba ziivalve zeqhude, ekugqibeleni zadlala indima ngexesha leMfazwe yesibini yeHlabathi. Ngeli xesha, iinjineli zayiphuhlisa ukuze isetyenziswe kwiinkqubo zamafutha eenqwelomoya zomkhosi. Emva kwempumelelo yeiivalve zebholakwiMfazwe Yehlabathi II, iinjineli zafaka iivalvu zebhola kwizicelo zamashishini.

Enye yezona zinto zibalulekileyo zihamba phambili ezinxulumene neevalve zebhola kwi-1950s yayikukuphuhliswa kweTeflon kunye nokusetyenziswa kwayo okulandelayo njengempahla yevalve yebhola. Emva kophuhliso oluyimpumelelo lweTeflon, amashishini amaninzi anjengeDuPont alwela ilungelo lokuyisebenzisa, kuba ayesazi ukuba iTeflon inokuzisa inzuzo enkulu kwimarike. Ekugqibeleni, ngaphezu kwenkampani enye yakwazi ukwenza iivalve zeTeflon. Iivalvu zebhola zeTeflon ziyaguquguquka kwaye zinokwenza amatywina afanelekileyo kumacala amabini. Ngamanye amazwi, zimbini. Zikwabubungqina bokuvuza. Ngo-1958, u-Howard Freeman wayengumvelisi wokuqala ukuyila ivalve yebhola enesihlalo seTeflon esiguquguqukayo, kwaye uyilo lwakhe lwalunelungelo elilodwa lomenzi wechiza.

Namhlanje, iivalve zebhola ziye zaphuhliswa ngeendlela ezininzi, kubandakanywa ukuhambelana kwazo eziphathekayo kunye nokusetyenziswa okunokwenzeka. Ukongeza, banokusebenzisa i-CNC machining kunye neprogram yekhompyuter (efana nemodeli yeqhosha) ukwenza iivalve ezilungileyo kakhulu. Kungekudala, abavelisi be-valve yebhola baya kukwazi ukubonelela ngokukhetha okungaphezulu kweemveliso zabo, kubandakanywa ukwakhiwa kwe-aluminium, ukunxiba okuncinci kunye nobuchule obukhulu be-throttling, obuvumela abaqhubi ukuba badlulise inani eliguquguqukayo lolwelo ngevalve ngesantya esincinci sokuhamba.

isicelo

Injongo yevalve yebhola kukulawula ukuhamba kwamanzi. Banokukwenza oku ngeendlela ezininzi. Bangakwazi ukulungelelanisa iintlobo ezithile zeevalve eziphantsi, zibonelela ngokhuseleko lokubuyela umva kwiivalve ezineendibano zokujonga i-swing, zihlukanise inkqubo, kwaye zinikeze ukuvalwa ngokupheleleyo kubaqhubi bezixhobo.

Ngenxa yokuba ziyakwazi ukulawulwa ngesandla okanye ngombane, iivalve zebhola zinokusebenza izicelo kunye nezicwangciso ezahlukeneyo.

Kwiimeko ezininzi, iivalvu zebhola zisetyenziselwa ukuvula nokuvala imibhobho equlethe izinto eziqinileyo, i-slurries, ulwelo okanye iigesi. Ezinye izicelo apho iivalvu zebhola ziqhele ukusetyenziswa ziquka iinkqubo zemibhobho, izixhobo, kunye nezixhobo phantse kuwo onke amashishini ahambisa ulwelo. Ungazifumana naphi na ukusuka kumgangatho wefektri ukuya kwitephu ekhayeni lakho. Amashishini asebenzisaiivalve zebholazibandakanya ukwenziwa, imigodi, i-oyile negesi, ezolimo, ukufudumeza kunye nokupholisa, imibhobho yoshishino neyendlu, amanzi, iimpahla zabathengi, ulwakhiwo, njl.