Umzekelo wokuqala ofana noivalvu yebholayivalvu enelungelo lobunikazi nguJohn Warren ngo-1871. Yivalvu ehleli ngentsimbi enebhola yobhedu kunye nesihlalo sobhedu. Ekugqibeleni uWarren wanika uJohn Chapman, intloko yeChapman Valve Company ilungelo lobunikazi loyilo lwakhe lwevalvu yebhola yobhedu. Nokuba siyintoni na isizathu, uChapman akazange afake uyilo lukaWarren kwimveliso. Endaweni yoko, yena nabanye abavelisi beevalvu bebesebenzisa uyilo oludala kangangeminyaka emininzi.

Iivalvu zebhola, ezaziwa ngokuba ziivalvu zebhola, ekugqibeleni zadlala indima ngexesha leMfazwe Yehlabathi yesiBini. Ngeli xesha, iinjineli zayiphuhlisa ukuze isetyenziswe kwiinkqubo zamafutha eenqwelo-moya zomkhosi. Emva kwempumelelo yeiivalvu zebholaKwiMfazwe Yehlabathi yesiBini, iinjineli zasebenzisa iivalvu zebhola kwizicelo zoshishino.

Enye yezona zinto zibalulekileyo eziye zaphuhliswa ezinxulumene neevalvu zebhola ngeminyaka yoo-1950 yayikukuphuhliswa kweTeflon nokusetyenziswa kwayo njengesixhobo sevalvu yebhola. Emva kokuphuhliswa ngempumelelo kweTeflon, amashishini amaninzi afana neDuPont akhuphisana ngelungelo lokuyisebenzisa, kuba ayesazi ukuba iTeflon inokuzisa iingenelo ezinkulu kwimarike. Ekugqibeleni, iinkampani ezingaphezu kwenye zakwazi ukuvelisa iivalvu zeTeflon. Iivalvu zebhola zeTeflon ziguquguquka kwaye zinokwenza izitywino ezintle kwicala elinye. Ngamanye amazwi, zibhekisa kwicala elinye. Zikwangavuzi. Ngo-1958, uHoward Freeman wayengumenzi wokuqala ukuyila ivalvu yebhola enesihlalo seTeflon esiguquguqukayo, kwaye uyilo lwakhe lwanikwa ilungelo lomenzi.

Namhlanje, iivalvu zebhola ziye zaphuhliswa ngeendlela ezininzi, kuquka ukuhambelana kwazo nezinto kunye nokusetyenziswa kwazo okunokwenzeka. Ukongeza, banokusebenzisa i-CNC machining kunye neprogram yekhompyutha (njengemodeli yeButton) ukwenza iivalvu ezilungileyo. Kungekudala, abavelisi beevalvu zebhola baya kuba nakho ukubonelela ngeendlela ezininzi zokukhetha iimveliso zabo, kubandakanya ukwakhiwa kwe-aluminium, ukungonakali kakhulu kunye nokukwazi ukubhoboza kakhulu, okuvumela abaqhubi ukuba badlulise inani eliguquguqukayo lolwelo kwivalvu ngesantya sokuhamba esilinganiselweyo.

isicelo

Injongo yevalvu yebhola kukulawula ukuhamba kolwelo. Banokukwenza oku ngeendlela ezininzi. Banokulungisa iintlobo ezithile zeevalvu ezihamba kancinci, banike uthintelo lokubuyela umva kwiivalvu ezineendibano zokujonga ukujika, bahlukanise inkqubo, kwaye banike ukuvalwa okupheleleyo kwabaqhubi begiya.

Ngenxa yokuba zinokulawulwa ngesandla okanye ngombane, iivalvu zebhola zinokusebenza ngezicwangciso ezahlukeneyo.

Kwiimeko ezininzi, iivalvu zebhola zisetyenziselwa ukuvula nokuvala imibhobho enezinto eziqinileyo ezixhonyiweyo, amaxolo, ulwelo okanye iigesi. Ezinye iindlela apho iivalvu zebhola zisetyenziswa khona ziquka iinkqubo zemibhobho, izixhobo, kunye nezixhobo phantse kuzo zonke iimboni ezithutha ulwelo. Ungazifumana naphi na ukusuka kumgangatho wefektri ukuya kwimpompo ekhayeni lakho. Amashishini asebenzisaiivalvu zebholaziquka ukuveliswa kwemveliso, ukumbiwa kwemigodi, ioyile negesi, ezolimo, ukufudumeza nokupholisa, imibhobho yemizi-mveliso neyasekhaya, amanzi, iimpahla zabathengi, ulwakhiwo, njl.