Ivalve yesangoyimveliso yenguqu kwezoshishino. Nangona ezinye izivalo zevalvu, ezinje ngeevalvu zeglowubhu kunye neeplagi zeplagi, bezikhona ixesha elide, iivalve zesango zibambe indawo ephambili kushishino kumashumi eminyaka, kwaye kutsha nje baye bancama isabelo esikhulu sentengiso kuyilo lwevalve yebhola kunye noyilo lwebhabhathane. .

Umahluko phakathi kwevalve yesango kunye nevalve yebhola, ivalve yeplagi kunye nebhabhathane ivalve kukuba into yokuvala, ebizwa ngokuba yidiski, isango okanye i-occluder, iphakama ezantsi kwesiqu sevalve okanye i-spindle, iwushiye umgaqo wamanzi kwaye ingene kumphezulu wevalve, ebizwa ngokuba yibhonethi. kwaye ijikeleza kwi-spindle okanye i-spindle ngokujika okuphindaphindiweyo. Ezi zivalo zivula ngokushukuma komgca zikwabizwa ngokuba zii-multi turn or linear valves, ngokungafaniyo neevalvu zekota, ezinesiqu esijikeleza i-90 degrees kwaye aziqhelekanga ukuphakama.

Iivalve zesango zifumaneka kwizinto ezininzi ezahlukeneyo kunye noxinzelelo loxinzelelo. Ziqala ngobungakanani ukusuka kwiNPS elingana nesandla sakho ½ Intshi ukuya kwilori enkulu yeNPS 144 intshi. Iivalvu zesango zibandakanya izinto zokusa, ii-forgings, okanye izinto ezenziwe nge-welding, nangona uyilo lokuphosa lulawula.

Enye yezona zinto zinqwenelekayo zeevalve zesango kukuba zinokuvulwa ngokupheleleyo kunye nokuphazamiseka okuncinci okanye ukungqubuzana kwimingxuma yokuhamba. Ukumelana nokuhamba okunikelwe yi-valve yesango elivulekileyo liphantse lifana necandelo lombhobho kunye nobukhulu obufanayo be-port. Ke ngoko, iivalvu zesango zisaqwalaselwa ngamandla ukuthintela okanye ukuvala/ukuvala izicelo. Kolunye uhlobo lwegama levalvu, iivalvu zesango zibizwa ngokuba ziivalve zeglowubhu.

Iivalvu zesango azifanelekanga ukulawula ukuhamba okanye ukusebenza kulo naliphi na icala ngaphandle kokuvuleka ngokupheleleyo okanye ukuvala ngokupheleleyo. Ukusebenzisa ivalve yesango evuleke kancinane ukunyakamisa okanye ukulawula ukuhamba kungonakalisa ipleyiti yevalve okanye iringi yesitulo sevalve, kuba kwindawo equkuqelayo evuleleke kancinci edala isiphithiphithi, umphezulu wesitulo sevalve uya kungqubana.

Isimbo sevalve yesango

Ukusuka ngaphandle, iivalve ezininzi zesango zibukeka zifana. Nangona kunjalo, zininzi iindlela ezahlukeneyo zokuyila ezinokwenzeka. Uninzi lweevalvu zesango zibandakanya umzimba kunye nebhonethi, equlethe into yokuvala ebizwa ngokuba yidiski okanye isango. Into yokuvala idityaniswe kwisiqu esidlula kwibhonethi kwaye ekugqibeleni kwi-handwheel okanye enye idrayivu yokusebenzisa isiqu. Uxinzelelo olujikeleze i-valve stem lulawulwa ngokupakisha ukunyanzeliswa kwindawo yokupakisha okanye igumbi.

Ukushukuma kwepleyiti yevalve yesango kwisikhondo sevalve kugqiba ukuba isikhondo sevalve siyenyuka okanye izikrufu kwipleyiti yevalve ngexesha lokuvulwa. Le ntshukumo ikwachaza izimbo ezibini eziphambili ze-stem/disc zevalvu yesango: isiqu esinyukayo okanye esinganyukiyo isikhondo (NRS). Isiqu esinyukayo sesona simbo sidumileyo soyilo/idiski yoyilo kwimarike yoshishino, ngelixa isikhondo esinganyukiyo kudala sithandwa ngumsebenzi wamanzi kunye noshishino lwemibhobho. Ezinye izicelo zeenqanawa ezisasebenzisa iivalvu zesango kwaye zinezithuba ezincinci zisebenzisa isimbo se-NRS.

Uyilo oluqhelekileyo lwesiqu / ibhonethi kwiivalvu zoshishino yintambo yangaphandle kunye nejoka (OS & Y). Uyilo lwe-OS&Y lufaneleke ngakumbi kwindawo ezonakalisayo kuba imisonto ibekwe ngaphandle kwendawo yokutywinwa kwamanzi. Ihluke kwezinye iiplani zokuba i-handwheel ifakwe kwi-bushing phezulu kwijoka, kungekhona kwisiqu ngokwayo, ukwenzela ukuba i-handwheel ingavuki xa i-valve ivuliwe.

Ukwahlulahlula kweemarike zevalve yesango

Nangona kule minyaka ingama-50 idlulileyo, iivalvu ezijikelezayo ze-angle ekunene zithathe isabelo esikhulu kwimarike yevalvu yesango, amanye amashishini asathembele kakhulu kuwo, kubandakanywa neshishini le-oyile negesi. Nangona iivalvu zebhola zenze inkqubela kwimibhobho yerhasi yendalo, i-oyile ekrwada okanye imibhobho yolwelo iseyindawo yeevalvu zesango ezihleliyo ezinxuseneyo.

Kwimeko yobukhulu obukhulu, iivalve zesango ziselona khetho oluphambili kwizicelo ezininzi kwishishini lokucoca. Ukuqina koyilo kunye neendleko ezipheleleyo zobunini (kubandakanywa noqoqosho lokugcinwa) ngamanqaku anqwenelekayo kolu yilo lwemveli.

Ngokwesicelo, iinkqubo ezininzi zokucoca zisebenzisa amaqondo obushushu aphezulu kunobushushu bokusebenza obukhuselekileyo beTeflon, eyona nto isesona sihlalo siphambili kwiivalvu zebhola ezidadayo. Iivalve zebhabhathane ezisebenza kakhulu kunye neevalvu zebhola ezitywiniweyo zentsimbi ziqala ukufumana ukusetyenziswa ngakumbi kwizicelo zokucoca, nangona ixabiso labo lilonke lobunini lihlala liphezulu kunelo leevalvu zesango.

Ushishino lwezityalo zamanzi lusalawulwa ziivalvu zesango lentsimbi. Nakwizicelo ezingcwatyiweyo, zibiza ixabiso eliphantsi kwaye zihlala ixesha elide.

Ushishino lwamandla lusebenzisaiivalve zesango lengxubevangekwizicelo ezibandakanya uxinzelelo oluphezulu kakhulu kunye namaqondo obushushu aphezulu kakhulu. Nangona ezinye iivalvu zeglowubhu ezitsha zohlobo lwe-Y kunye neevalvu zentsimbi ezihlala phantsi ezenzelwe inkonzo yokuthintela ziye zafunyanwa kwindawo yombane, iivalvu zesango zisathandwa ngabayili beplanti kunye nabasebenzi.