I-valve yokusiza ukuphepha, eyaziwa nangokuthi i-valve echichimayo yokuphepha, iyithuluzi lokuzenzakalela lokukhulula ukucindezela eliqhutshwa ukucindezela okuphakathi. Ingasetshenziswa kokubili njenge-valve yokuphepha kanye ne-valve yokusiza kuye ngokuthi isicelo.

Uma sithatha isibonelo saseJapane, kunezincazelo ezimbalwa ngokuqhathaniswa ezicacile zamavalvu okuphepha namavalvu okusiza. Ngokuvamile, izinto zokuphepha ezisetshenziselwa imikhumbi emikhulu yokucindezela ukugcina amandla njengama-boilers zibizwa ngokuthi ama-valve okuphepha, futhi lawo afakwe emapayipini noma kwezinye izinsiza abizwa ngokuthi ama-valve okusiza. Kodwa-ke, ngokuya ngezinhlinzeko "Zezimiso Zobuchwepheshe Zokukhiqiza Amandla Ashisayo" woMnyango Wezohwebo Nezimboni Zamazwe Ngamazwe wase-Japan, izingxenye ezibalulekile zokuqinisekisa ukuphepha kwemishini zicacisa ukusetshenziswa kwama-valve okuphepha, njengama-boilers, ama-superheaters, ama-reheaters, njll. Ezimeni lapho uhlangothi oluphansi lwe-valve yokunciphisa ukucindezela ludinga ukuxhunywa kubhayela ne-turbine, i-valve yokukhulula noma i-valve yokuphepha idinga ukufakwa. Ngale ndlela, i-valve yokuphepha idinga ukwethembeka ngaphezu kwe-valve yokusiza.

Ngaphezu kwalokho, kusukela emithethweni yokuphatha igesi enomfutho ophezulu woMnyango Wezabasebenzi waseJapan, imithetho yoMnyango Wezokuthutha kanye nezinhlangano zemikhumbi kuwo wonke amazinga, ukuhlonzwa nemithethonqubo yevolumu yokuphuma okuphephile, sibiza i-valve eqinisekisa ivolumu yokuphuma nge-valve yokuphepha, kanye ne-valve engaqinisekisi ivolumu yokukhipha i-valve yokusiza. E-China, kungakhathaliseki ukuthi ivuliwe ngokugcwele noma ivuliwe kancane, ihlangene ibizwa ngokuthi i-valve yokuphepha.

1. Uhlolojikelele

Ama-valve okuphepha ayizesekeli ezibalulekile zokuphepha kuma-boilers, imikhumbi yokucindezela nezinye izinto zokucindezela. Ukuthembeka kokusebenza kwazo kanye nekhwalithi yokusebenza kwazo kuhlobene ngokuqondile nokuphepha kwemishini kanye nabasebenzi, futhi kuhlobene eduze nokongiwa kwamandla nokuvikelwa kwemvelo. Nokho, abanye abasebenzisi kanye neminyango yokuklama bahlale bekhetha imodeli engalungile lapho bekhetha. Ngenxa yalesi sizathu, lesi sihloko sihlaziya ukukhethwa kwama-valve okuphepha.

2. Incazelo

Okubizwa ngokuthi ama-valve okuphepha ngokuvamile ahlanganisa ama-valve okusiza. Kusukela emithethweni yokuphatha, ama-valve afakwe ngokuqondile kuma-boilers we-steam noma uhlobo lwemikhumbi yokucindezela kufanele agunyazwe umnyango wokuqondisa wezobuchwepheshe. Ngomqondo omncane, abizwa ngokuthi ama-valve okuphepha, kanti amanye ngokuvamile abizwa ngokuthi ama-valve okusiza. Ama-valve okuphepha kanye nama-valve okusiza afana kakhulu ngesakhiwo nokusebenza. Bobabili bakhipha ngokuzenzakalelayo i-medium yangaphakathi lapho ingcindezi yokuvula idlula ukuze kuqinisekiswe ukuphepha kwemishini yokukhiqiza. Ngenxa yalokhu kufana okubalulekile, abantu bavame ukudida lezi zinto ezimbili lapho bezisebenzisa. Ngaphezu kwalokho, ezinye izinto zokukhiqiza nazo zisho ukuthi noma yiluphi uhlobo lungakhethwa emithethweni. Ngakho-ke, umehluko phakathi kokubili ngokuvamile awunakwa. Ngenxa yalokho, kuphakama izinkinga eziningi. Uma sifuna ukunikeza incazelo ecacile yalokho okubili, singakuqonda ngokuvumelana nencazelo engxenyeni yokuqala ye-ASME Boiler kanye Nekhodi Yomkhumbi Wokucindezela:

(1)I-valve yokuphepha, idivayisi yokusiza ukucindezela okuzenzakalelayo eshayelwa ukucindezela okumile kwendawo ephakathi phambi kwe-valve. Ibonakala ngesenzo sokuvula esigcwele ngokuvuleka okungazelelwe. Isetshenziswa ekusetshenzisweni kwegesi noma umusi.

(2)I-valve yokukhulula, eyaziwa nangokuthi i-valve echichimayo, iyithuluzi lokuzenzakalela lokukhulula ukucindezela eliqhutshwa ukucindezela okumile kwendawo ephambi kwevalvu. Ivula ngokulingana nokwanda kokucindezela okudlula amandla okuvula. Isetshenziswa kakhulu ekufakweni koketshezi.