Indawo yokuvala i-valve ivame ukugqwala, iguguleke futhi igqokwe yi-medium, ngakho-ke iyingxenye ewonaka kalula ku-valve. Njenge-valve yebhola ye-pneumatic kanye ne-butterfly valve kagesi namanye ama-valve othomathikhi, ngenxa yokuvulwa nokuvala okuvamile nokushesha, izinga labo kanye nokuphila kwesevisi kuthinteka ngokuqondile. Imfuneko eyisisekelo yendawo yokuvala i-valve ukuthi i-valve ingaqinisekisa ukuvalwa okuphephile nokuthembekile ngaphansi kwezimo zokusebenza ezishiwo. Ngakho-ke, impahla ye-surface kufanele ibe nalezi zici ezilandelayo:
(1) Ukusebenza kahle kokuvala, okungukuthi, indawo yokuvala kufanele ikwazi ukuvimbela ukuvuza kwendawo;
(2) Inamandla athile, indawo yokuvala kufanele ikwazi ukumelana nenani elithile lokucindezela lokuvala okwakhiwa umehluko wokucindezela ophakathi nendawo;
(3) Ukumelana nokugqwala, ngaphansi kwesevisi yesikhathi eside yendawo edlayo kanye nengcindezi, indawo yokuvala kufanele ibe nokumelana nokugqwala okuqinile okuhambisana nezidingo zokuklama;
(4) Ikhono lokumelana nokuklwebheka, ukuvala ama-valve kuyizimpawu eziguquguqukayo, futhi kukhona ukungqubuzana phakathi kokubekwa uphawu ngesikhathi sokuvula nokuvala;
(5) Ukumelana nokuguguleka, indawo evalekayo kufanele ikwazi ukumelana nokuguguleka kwemithombo yezindaba enesivinini esikhulu kanye nokushayisana kwezinhlayiya eziqinile;
(6) Ukuzinza okuhle kokushisa, indawo yokuvala uphawu kufanele ibe namandla anele kanye nokumelana ne-oxidation ezingeni lokushisa eliphezulu, futhi kufanele ibe nokumelana okuhle okubandayo okubandayo ekushiseni okuphansi;
(7) Ukusebenza kahle kokucubungula, ukukhiqiza nokugcinwa kalula, i-valve isetshenziswa njengengxenye yenhloso evamile, futhi iqinisekisiwe ukuthi inenani lezomnotho.
Izimo zokusebenzisa kanye nezimiso zokukhetha ze-valve sealing surface materials. Izinto ezingaphezulu zokuvala uphawu zihlukaniswe izigaba ezimbili: zensimbi nezingezona ezensimbi. Izimo ezisebenzayo zezinto ezisetshenziswa kakhulu zimi kanje:
(1) Irabha. Ngokuvamile isetshenziselwa isimo sokuvalwa kwamavalvu esango anengcindezi ephansi, ama-diaphragm valves, ama-butterfly valves, ama-valve okuhlola namanye ama-valve.
(2) Ipulasitiki. Amapulasitiki asetshenziselwa indawo yokuvala inayiloni ne-PTFE, anezici zokumelana nokugqwala okuhle kanye ne-coefficient encane yokungqubuzana.
(3) Babbitt. Eyaziwa nangokuthi i-bearing alloy, inokumelana nokugqwala okuhle nekhono elihle lokugijima. Ilungele indawo yokuvala yevalve yokuvala i-ammonia enengcindezi ephansi kanye nezinga lokushisa elingu-70-150 ℃.
(4) Ingxube yethusi. Inokumelana okuhle kokugqoka kanye nokumelana nokushisa okuthile. Ilungele i-valve yeglobu, i-cast iron gate valve kanye ne-valve yokuhlola, njll. Ngokuvamile isetshenziselwa amanzi nesitimu ngokucindezela okuphansi kanye nezinga lokushisa elingekho ngaphezu kuka-200 ℃.
(5) Insimbi engagqwali ye-Chrome-nickel. Inokumelana nokugqwala okuhle, ukumelana nokuguguleka nokumelana nokushisa. Ifanele imidiya efana ne-vapor nitric acid.
(6) Insimbi engagqwali ye-Chrome. Inokumelana nokugqwala okuhle futhi imvamisa isetshenziswa kumavalvu anomfutho ophezulu kanye nezinga lokushisa elingekho ngaphezu kuka-450 ℃ kumafutha, umhwamuko wamanzi neminye imidiya.
(7) Insimbi ephezulu ye-chromium engaphezulu. Inokumelana nokugqwala okuhle nokusebenza kokuqina komsebenzi, futhi ifanele ukucindezela okuphezulu, uwoyela okushisa okuphezulu, umusi kanye neminye imidiya.
(8) Insimbi ene-nitrided. Inokumelana nokugqwala okuhle nokumelana nokuklwebheka, futhi imvamisa isetshenziswa kumavalvu esango lesiteshi samandla ashisayo. Lokhu kwaziswa kungabuye kukhethelwe indawo yama-valve ebhola avalwe kanzima.
(9) Carbide. Inezici ezinhle ezihlanganisayo njengokumelana nokugqwala, ukumelana nokuguguleka nokumelana nokuklwebheka, futhi inempilo ende yesevisi. Kuyinto ekahle yokuvala uphawu. I-tungsten drill alloy esetshenziswa ngokujwayelekile kanye ne-drill base alloy surfacing electrode, njll., ingenza i-ultra-high, i-ultra-high sealing surface, ifanele uwoyela, uwoyela, igesi, i-hydrogen neminye imidiya.
(10) Futha ingxubevange yokushisela. Kukhona ama-alloys asekelwe ku-cobalt, ama-alloys asekelwe ku-nickel, nama-alloys asekelwe esilevini, anokumelana nokugqwala okuhle nokungagugi.
Ukuze kuqinisekiswe ukuphepha nokuthembeka kwe-valve seal, into ekhethiwe kufanele inqunywe ngokuvumelana nezimo ezithile zokusebenza. Uma okuphakathi kudla kakhulu, lapho kukhethwa izinto ezisetshenziswayo, kufanele kuhlangabezane nokusebenza okugqwalayo ekuqaleni, bese kuhlangabezana nezidingo zezinye izakhiwo; Isivalo se-valve yesango kufanele sinake ukumelana okuhle nokuklwebheka; Ama-valve okuphepha, ama-throttle valves kanye nama-valve alawulayo aguguleka kalula yi-medium, futhi izinto ezikwazi ukumelana nokugqwala kufanele zikhethwe; Ngesakhiwo esifakiwe sendandatho yokuvala kanye nomzimba, izinto ezinobunzima obuphezulu kufanele zithathwe njengendawo yokuvala; Ama-valve avamile anezinga lokushisa eliphansi nokucindezela kufanele akhethe irabha nepulasitiki esebenza kahle njengokuvala; Uma ukhetha izinto zokuvala, kufanele kuqashelwe ukuthi ubunzima bobuso besihlalo se-valve kufanele bube buphakeme kunobuphezulu bokuvalwa kwe-valve disc.
Isikhathi sokuthumela: Nov-02-2022