Ivalve yoncedo lokhuseleko, ekwaziwa ngokuba yivalve yokuphuphuma kokhuseleko, sisixhobo sokunceda uxinzelelo oluzenzekelayo oluqhutywa luxinzelelo oluphakathi. Ingasetyenziselwa zombini i-valve yokhuseleko kunye ne-valve yokunceda ngokuxhomekeke kwisicelo.

Xa sicinga ngomzekelo waseJapan, kukho iingcaciso ezimbalwa ezicacileyo zeevalvu zokhuseleko neevalvu zokukhulula. Ngokubanzi, izixhobo zokhuseleko ezisetyenziselwa iinqanawa zoxinzelelo ezinkulu zokugcina amandla ezinje ngeebhoyila zibizwa ngokuba ziivalve zokhuseleko, kwaye ezo zifakwe kwimibhobho okanye ezinye izibonelelo zibizwa ngokuba ziivalve zoncedo. Nangona kunjalo, ngokwemiqathango ye "Imigangatho yobuGcisa yoMveliso woMbane we-Thermal" woMphathiswa wezoRhwebo lwaMazwe ngamazwe kunye neShishini laseJapan, iindawo ezibalulekileyo zokuqinisekisa ukhuseleko lwezixhobo zichaza ukusetyenziswa kweevalvu zokhuseleko, ezifana ne-boilers, superheaters, reheaters, njl. Kwiimeko apho icala elisezantsi levalve yokunciphisa uxinzelelo kufuneka lidityaniswe kwibhoyila kunye ne-injini yomoya, ivalve yokukhulula okanye ivalve yokhuseleko kufuneka ifakwe. Ngale ndlela, i-valve yokhuseleko idinga ukuthembeka ngakumbi kune-valve yokunceda.

Ukongeza, kwimithetho yolawulo lwegesi yoxinzelelo oluphezulu lweSebe lezeMisebenzi yaseJapan, imigaqo yoMphathiswa wezoThutho kunye nemibutho yeenqanawa kuwo onke amanqanaba, ukuchongwa kunye nemigaqo yomthamo okhuselekileyo wokukhupha, sibiza ivalve eqinisekisa ukukhutshwa. umthamo wevalve yokhuseleko, kunye nevalve engaqinisekisi umthamo wokukhupha ivalve yokukhulula. E-China, nokuba ivuliwe ngokupheleleyo okanye ivuleke kancinci, ibizwa ngokuba yivalve yokhuseleko.

1. Isishwankathelo

Iivalve zokhuseleko zizixhobo ezibalulekileyo zokhuseleko kwiibhoyili, iinqanawa zoxinzelelo kunye nezinye izixhobo zoxinzelelo. Ukuthembeka komsebenzi wabo kunye nomgangatho wokusebenza kwabo kuhambelana ngokuthe ngqo nokhuseleko lwezixhobo kunye nabasebenzi, kwaye zihambelana ngokusondeleyo nokugcinwa kwamandla kunye nokukhuselwa kwendalo. Nangona kunjalo, abanye abasebenzisi kunye namasebe oyilo ahlala ekhetha imodeli engalunganga xa ukhetha. Ngenxa yesi sizathu, eli nqaku lihlalutya ukukhethwa kweevalve zokhuseleko.

2. Ingcaciso

Izinto ezibizwa ngokuba ziivalvu zokhuseleko zibandakanya iivalvu zoncedo. Ukususela kwimigaqo yokulawula, ii-valve ezifakwe ngokuthe ngqo kwiibhoyili ze-steam okanye uhlobo lweenqanawa zoxinzelelo kufuneka zivunywe lisebe lokulawula ubugcisa. Ngengqiqo emxinwa, zibizwa ngokuba ziivalvu zokhuseleko, kwaye ezinye zibizwa ngokuba ziivalve zokukhulula. Iivalve zokhuseleko kunye neevalve zokukhulula zifana kakhulu kwisakhiwo kunye nokusebenza. Bobabini bakhupha ngokuzenzekelayo i-medium yangaphakathi xa uxinzelelo lokuvula lugqithiswa ukuze kuqinisekiswe ukhuseleko lwezixhobo zokuvelisa. Ngenxa yoku kufana okubalulekileyo, abantu bahlala bebhidanisa ezi zimbini xa bezisebenzisa. Ukongeza, ezinye izixhobo zokuvelisa zikwachaza ukuba naluphi na uhlobo lunokukhethwa kwimithetho. Ngoko ke, iiyantlukwano phakathi kwezi zibini zihlala zingahoywa. Ngenxa yoko, kuvela iingxaki ezininzi. Ukuba sifuna ukunika inkcazo ecacileyo yezi zimbini, sinokuziqonda ngokwenkcazo kwinxalenye yokuqala ye-ASME Boiler kunye neKhowudi yeVessel yoxinzelelo:

(1)Ivalve yokhuseleko, isixhobo sokunciphisa uxinzelelo oluzenzekelayo oluqhutywa yi-static pressure ye-medium phambi kwevalve. Ibonakaliswe ngesenzo esipheleleyo sokuvula ngokuvula ngokukhawuleza. Isetyenziselwa ukusetyenziswa kwegesi okanye i-steam.

(2)Ivalve yokunceda, ekwabizwa ngokuba yivalve yokuphuphuma, sisixhobo sokunceda uxinzelelo oluzenzekelayo oluqhutywa luxinzelelo lwe-static lwemedium phambi kwevalve. Ivula ngokulingana nokunyuka koxinzelelo oludlula amandla okuvula. Isetyenziswa ikakhulu kwizicelo zolwelo.