Phakathi kwabasebenzisi abasebenzisa ama-globe valve amakhulu nsuku zonke, bavame ukubika inkinga yokuthi ama-globe valve amakhulu avame ukuba nzima ukuwavala uma esetshenziswa ezindabeni ezinomehluko omkhulu wokucindezela, njengomusi, amanzi aphezulu, njll. Uma uvala ngamandla, kuhlale kutholakala ukuthi kuzoba nokuvuza, futhi kunzima ukuvala ngokuqinile. Isizathu sale nkinga sibangelwa ukwakheka kwe-valve kanye ne-torque enganele yokukhipha yezinga lomkhawulo womuntu.

Ukuhlaziywa Kobunzima Bokushintsha Ama-Valve Angububanzi Obukhulu

Amandla okukhipha ajwayelekile omkhawulo ovundlile womuntu omdala angama-60-90kg, kuye ngemizimba ehlukene.

Ngokuvamile, indlela yokugeleza kwevalvu yomhlaba iklanyelwe ukuba ibe phansi ngaphakathi naphezulu. Uma umuntu evala ivalvu, umzimba womuntu usunduza isondo lesandla ukuze lijikeleze ngokuvundlile, ukuze i-valve flap iye phansi ukuze kufinyelelwe ukuvala. Ngalesi sikhathi, kuyadingeka ukunqoba inhlanganisela yamandla amathathu, okungukuthi:

(1) Amandla okusunduza e-Axial Fa;

(2) Amandla okungqubuzana Fb phakathi kokupakisha kanye nesiqu se-valve;

(3) Amandla okungqubuzana kokuxhumana i-Fc phakathi kwesiqu se-valve kanye ne-valve disc core

Ingqikithi yezikhathi ingu-∑M=(Fa+Fb+Fc)R

Kungabonakala ukuthi uma ububanzi bukhulu, kulapho amandla okusunduza e-axial eba makhulu khona. Uma eseduze nesimo sokuvalwa, amandla okusunduza e-axial acishe asondele kakhulu ekucindezelweni kwangempela kwenethiwekhi yamapayipi (ngenxa ye-P1-P2≈P1, P2=0)

Isibonelo, i-valve ye-DN200 caliber globe isetshenziswa epayipini le-steam elingu-10bar, kuphela i-axial thrust yokuqala yokuvala i-Fa=10×πr2=3140kg, futhi amandla ajikelezayo aqondile adingekayo ukuze kuvalwe aseduze namandla ajikelezayo aqondile imizimba yabantu evamile engawakhipha.

Yiqiniso, amanye amafektri ancoma ukufaka ama-valve anjalo ngokuphambene, okuxazulula inkinga yokuba nzima ukuwavala, kodwa kukhona nenkinga yokuthi kunzima ukuwavula ngemva kokuvala.

Ukuhlaziywa Kwezimbangela Zokuvuza Kwangaphakathi Kwama-Large Diameter Globe Valve

Amavalvu amakhulu ambozwe nge-globe ngokuvamile asetshenziswa ezindaweni zokubeka amabhoyila, amasilinda amakhulu, izinsiza zomusi kanye nezinye izindawo. Lezi zindawo zinezinkinga ezilandelayo:
(1) Ngokuvamile, umehluko wokucindezela endaweni yokukhipha ibhoyila mkhulu kakhulu, ngakho-ke izinga lokugeleza komusi nalo likhulu, kanti umonakalo wokuguguleka kwendawo yokuvala nawo mkhulu. Ngaphezu kwalokho, ukusebenza kahle kokushisa kwebhoyila akukwazi ukuba yi-100%, okuzobangela ukuthi umusi endaweni yokukhipha ibhoyila ube nokuqukethwe kwamanzi amaningi, okuzobangela kalula ukulimala kwe-cavitation kanye ne-cavitation endaweni yokuvala ivalvu.

(2) Nge-valve yokuma eduze kwendawo yokuphuma yebhoyila kanye ne-sub-cylinder, ngoba umusi osanda kuphuma ebhoyila uba nokushisa okukhulu ngezikhathi ezithile, enkambisweni yokugcwala kwawo, uma ukwelashwa kokuthambisa kwamanzi ebhoyila kungalungile kakhulu, ingxenye yamanzi ivame ukukhukhuleka. Izinto ze-asidi ne-alkali zizobangela ukugqwala nokuguguleka endaweni yokuvala; ezinye izinto ezikristalu zingase zinamathele endaweni yokuvala yebhoyila futhi zikristalu, okuholela ekutheni i-valve ingakwazi ukuvala kahle.

(3) Kuma-valve okungena nawokuphuma kwama-sub-cylinder, ukusetshenziswa komusi ngemva kwe-valve kukhulu futhi ngezinye izikhathi kuncane ngenxa yezidingo zokukhiqiza nezinye izizathu. Kubangela ukuguguleka, ukuqhekeka kanye nokunye ukulimala ebusweni bokuvala i-valve.

(4) Ngokuvamile, uma kuvulwa ipayipi elikhulu, ipayipi kudingeka lishiswe, futhi inqubo yokushisa kusengaphambili ngokuvamile idinga ukugeleza okuncane komusi ukuze kudlule, ukuze ipayipi likwazi ukushiswa kancane nangokulinganayo ngezinga elithile ngaphambi kokuba ivalvu yokuma ivulwe ngokugcwele ukuze kugwenywe ukubangela umonakalo wepayipi. Ukushisa okusheshayo kubangela ukwanda ngokweqile, okulimaza ezinye izingxenye zokuxhuma. Kodwa-ke, kule nqubo, ukuvulwa kwevalvu kuvame ukuba kuncane kakhulu, okubangela izinga lokuguguleka libe likhulu kakhulu kunomphumela ojwayelekile wokusetshenziswa, futhi kunciphisa kakhulu impilo yenkonzo yendawo yokuvala ivalvu.

Izixazululo Zobunzima Bokushintsha Ama-Large Diameter Globe Valve

(1) Okokuqala, kunconywa ukukhetha ivalvu yeglobhu evaliwe nge-bellows, egwema ithonya lokumelana nokungqubuzana kwevalvu ye-plunger kanye nevalvu yokupakisha, futhi yenza kube lula ukushintsha.

(2) Ingaphakathi le-valve kanye nesihlalo se-valve kumele kwenziwe ngezinto ezikwazi ukumelana nokuguguleka okuhle kanye nokusebenza kahle kokuguguleka, njenge-Stellite carbide;

(3) Kunconywa ukusebenzisa isakhiwo sediski esine-valve ephindwe kabili, esingeke sibangele ukuguguleka okukhulu ngenxa yokuvulwa okuncane, okuzothinta impilo yesevisi kanye nomphumela wokuvala.