Phakathi kwabasebenzisi abasebenzisa amavalvu eglobhu anobubanzi obukhulu nsuku zonke, bavame ukubika inkinga yokuthi amavalvu eglobhu anobubanzi obukhulu kuvame ukuba nzima ukuvala lapho esetshenziswa kumidiya onomehluko omkhulu wengcindezi, njengesitimu, umfutho ophakeme. amanzi, njll. Uma uvala ngamandla, kutholakala njalo ukuthi kuzoba nokuvuza, futhi kunzima ukuvala ngokuqinile. Isizathu sale nkinga sibangelwa ukwakheka kwesakhiwo se-valve kanye ne-torque enganele yezinga lomkhawulo womuntu.

Ukuhlaziywa Kobunzima Ekushintsheni Amavalvu Amakhulu Obubanzi

Isilinganiso samandla okukhipha umkhawulo ovundlile womuntu omdala singama-60-90kg, kuya ngemizimba ehlukene.

Ngokuvamile, isiqondiso sokugeleza kwe-valve yembulunga yakhelwe ukuba ibe phansi futhi ibe phezulu. Lapho umuntu evala i-valve, umzimba womuntu uphusha isondo lesandla ukuze ujikeleze ngokuvundlile, ukuze i-valve flap iye phansi ukuze ibone ukuvala. Ngalesi sikhathi, kuyadingeka ukunqoba ukuhlanganiswa kwamandla amathathu, okungukuthi:

(1) Axial thrust force Fa;

(2) I-friction force Fb phakathi kokupakisha ne-valve stem;

(3) Amandla okushayisana okuthintana nawo Fc phakathi kwesiqu se-valve kanye nomongo wediski yevalvu

Isamba sezikhathi singu-∑M=(Fa+Fb+Fc)R

Kuyabonakala ukuthi uma ubukhulu be-diameter buba bukhulu, bukhulu amandla we-axial thrust. Uma iseduze nesimo esivaliwe, i-axial thrust force icishe isondele ekucindezelweni kwangempela kwenethiwekhi yamapayipi (ngenxa ye-P1-P2≈P1, P2=0)

Isibonelo, kusetshenziswa ivalvu yeglobhu yezinga le-DN200 epayipini lesitimu eliyi-10bar, i-axial thrust yokuqala yokuvala engu-Fa=10×πr2=3140kg, futhi amandla ayindilinga avundlile adingekayo ukuze kuvalwe aseduze namandla ayindilinga avundlile imizimba yabantu evamile engawenza. okukhiphayo. umkhawulo wokuphoqa, ngakho-ke kunzima kakhulu kumuntu oyedwa ukuvala ngokugcwele i-valve ngaphansi kwalesi simo.

Yiqiniso, ezinye izimboni zitusa ukufaka ama-valve anjalo ngokuphambene, okuxazulula inkinga yokuba nzima ukuvala, kodwa kunenkinga yokuthi kunzima ukuyivula ngemva kokuvala.

Ukuhlaziywa Kwezimbangela Zokuvuza Kwangaphakathi Kwe-Large Diameter Globe Valves

Amavalvu eglobhu anobubanzi obukhulu asetshenziswa ngokujwayelekile kuma-boiler outlets, amasilinda amakhulu, amapayipi omusi nezinye izindawo. Lezi zindawo zinezinkinga ezilandelayo:
(1) Ngokuvamile, umehluko wengcindezi kubhayela mukhulu uma kuqhathaniswa, ngakho izinga lokugeleza kwesitimu nalo likhulu, futhi nomonakalo wokuguguleka endaweni evalekayo nawo mkhulu. Ukwengeza, ukusebenza kahle komlilo we-boiler angeke kube ngu-100%, okuzokwenza ukuthi umusi ekuphumeni kwebhoyili ube nomthamo omkhulu wamanzi, okuzobangela kalula ukulimala kwe-cavitation kanye ne-cavitation endaweni yokuvala i-valve.

(2) Kuvalvu yokumisa eduze nendawo yokuphuma kubhayela kanye ne-sub-cylinder, ngenxa yokuthi isitimu esisanda kuphuma kubhayela sinezinto ezishisa kakhulu, ngesikhathi sokugcwala kwawo, uma ukuthambisa amanzi kubhayela. ayilungile kakhulu, ingxenye yamanzi ivame ukuna. Izinto ze-Acid ne-alkali zizodala ukugqwala nokuguguleka endaweni evalayo; ezinye izinto ezicwebezelayo zingase zinamathele endaweni evalekayo ye-valve futhi zicwebezele, okuholela ekutheni i-valve ingakwazi ukuvala ngokuqinile.

(3) Kumavalvu okungenisa nokuphuma amasilinda angaphansi, ukusetshenziswa kwesitimu ngemva kwevalvu kukhulu futhi ngezinye izikhathi kuncane ngenxa yezidingo zokukhiqiza nezinye izizathu. Idala ukuguguleka, i-cavitation kanye nomunye umonakalo endaweni yokuvala i-valve.

(4) Ngokuvamile, lapho kuvulwa ipayipi eliwububanzi obukhulu, ipayipi lidinga ukushisisa ngaphambili, futhi inqubo yokushisa ngaphambili ngokuvamile idinga ukugeleza okuncane kwesitimu ukuze kudlule, ukuze ipayipi likwazi ukufudumeza kancane futhi ngokulinganayo ngokwezinga elithile. ngaphambi kokuthi i-valve yokumisa ivuleke ngokugcwele ukuze kugwenywe ukulimaza amapayipi. Ukushisa okusheshayo kubangela ukwanda ngokweqile, okulimaza izingxenye ezithile zokuxhuma. Kodwa-ke, kule nqubo, ukuvuleka kwe-valve kuvame ukuba kuncane kakhulu, okwenza izinga lokuguguleka libe likhulu kakhulu kunomphumela ovamile wokusetshenziswa, futhi kunciphisa kakhulu impilo yesevisi yendawo yokuvala i-valve.

Izixazululo Zobunzima Ekushintsheni Ama-Valves E-Diameter Enkulu

(1) Okokuqala, kunconywa ukukhetha i-valve yeglobu enezimbongolo, egwema ithonya lokumelana nokungqubuzana kwe-valve ye-plunger kanye ne-valve yokupakisha, futhi yenza ukushintshwa kube lula.

(2) I-valve core kanye nesihlalo se-valve kufanele senziwe ngezinto ezikwazi ukumelana nokuguguleka nokuguga, njenge-Stellite carbide;

(3) Kunconywa ukuba yamukele isakhiwo se-disc ye-valve ephindwe kabili, engeke ibangele ukuguguleka ngokweqile ngenxa yokuvulwa okuncane, okuzothinta impilo yesevisi kanye nomphumela wokuvala.