Umphezulu wokutywina wevalve udla ngokugqwala, ukhukuliswe kwaye unxitywe yi-medium, ngoko ke yinxalenye eyonakaliswa lula kwivalve. Njenge-valve yebhola ye-pneumatic kunye ne-valve ye-butterfly yombane kunye nezinye ii-valve ezizenzekelayo, ngenxa yokuvula nokuvala ngokukhawuleza, umgangatho wabo kunye nobomi benkonzo buchaphazeleka ngokuthe ngqo. Imfuno esisiseko ye-valve yokutywinwa kwendawo kukuba i-valve inokuqinisekisa ukutywinwa okukhuselekileyo nokuthembekileyo phantsi kweemeko zokusebenza ezichaziweyo. Ke ngoko, izinto zomphezulu kufuneka zibe nezi zinto zilandelayo:
(1) Ukusebenza kakuhle kokutywina, oko kukuthi, umphezulu wokutywina kufuneka ukwazi ukuthintela ukuvuza komthombo;
(2) Inamandla athile, umphezulu wokutywina kufuneka ukwazi ukumelana nexabiso elithile loxinzelelo lokutywinwa okwenziwe ngumahluko ophakathi woxinzelelo;
(3) Ukuxhatshazwa kwe-Corrosion, phantsi kwenkonzo yexesha elide ye-corrosion medium kunye noxinzelelo, indawo yokutywina kufuneka ibe nokumelana okuqinileyo kwe-corrosion ehambelana neemfuno zoyilo;
(4) Ukukwazi ukumelana nemikrwelo, ukutywinwa kwevalve zizo zonke izitywina eziguqukayo, kwaye kukho ukungqubana phakathi kokutywinwa ngexesha lokuvula nokuvala;
(5) Ukumelana nokuguguleka, indawo yokutywina kufuneka ikwazi ukuxhathisa ukukhukuliseka kweendaba ze-high-speed media kunye nokungqubana kwamasuntswana aqinileyo;
(6) Uzinzo oluhle lwe-thermal, umphezulu wokutywina kufuneka ube namandla okwaneleyo kunye nokumelana ne-oxidation kwiqondo lokushisa eliphezulu, kwaye kufuneka ube nokuchasana okubandayo okubandayo kwiqondo lokushisa eliphantsi;
(7) Ukusebenza kakuhle kokusebenza, kulula ukwenza kunye nokugcinwa, i-valve isetyenziswe njengenxalenye yenjongo jikelele, kwaye iqinisekisiwe ukuba inexabiso lezoqoqosho.
Iimeko zokusetyenziswa kunye nemigaqo yokukhethwa kwezinto ezingaphezulu zokutywinwa kwevalve. Izinto ezingaphezulu zokutywinwa zihlukaniswe ngamacandelo amabini: isinyithi kunye ne-non-metal. Iimeko ezisebenzayo zezinto ezisetyenziswa ngokuqhelekileyo zezi zilandelayo:
(1) Irabha. Ngokuqhelekileyo isetyenziselwa imeko yokutywinwa kweevalvu zesango ezisezantsi zoxinzelelo oluthambileyo, iivalve zediaphragm, iivalve zebhabhathane, iivalve zokujonga kunye nezinye iivalvu.
(2) Iplastiki. Iiplastiki ezisetyenziselwa ukutywinwa komhlaba ziyi-nylon kunye ne-PTFE, ezineempawu zokuxhathisa okulungileyo kunye ne-coefficient encinci ye-friction.
(3) Babbitt. Ikwaziwa ngokuba yi-alloy ethwalayo, inokumelana ne-corrosion elungileyo kunye nokukwazi ukusebenza kakuhle. Ilungele indawo yokutywina yevalve yokuvala i-ammonia ngoxinzelelo oluphantsi kunye nobushushu be-70-150 ℃.
(4) Ingxubevange yobhedu. Inokumelana nokunxiba kakuhle kunye nokumelana nobushushu obuthile. Ilungele ivalve yeglowubhu, ivalve yesango yentsimbi kunye nevalve yokutshekisha, njl. Ngokuqhelekileyo isetyenziselwa amanzi kunye nomphunga ngoxinzelelo oluphantsi kunye nobushushu obungekho ngaphezulu kwe-200 ℃.
(5) I-Chrome-nickel insimbi engenasici. Inokumelana ne-corrosion, ukumelana nokukhukuliseka kunye nokumelana nobushushu. Ifanelekile kwimidiya efana nomphunga we-nitric acid.
(6) Chrome steel stainless. Inokumelana ne-corrosion elungileyo kwaye idla ngokusetyenziswa kwiivalvu ezinoxinzelelo oluphezulu kunye nobushushu obungekho ngaphezulu kwe-450 ℃ kwi-oyile, umphunga wamanzi kunye nezinye imidiya.
(7) Intsimbi ephezulu yokujonga ichromium. Inokumelana ne-corrosion elungileyo kunye nokusebenza nzima, kwaye ifanelekile kuxinzelelo oluphezulu, i-oyile yobushushu obuphezulu, umphunga kunye neminye imithombo yeendaba.
(8) Intsimbi ene-nitrided. Inokumelana nokugqwala okuhle kunye nokumelana nokukrweleka, kwaye idla ngokusetyenziswa kwizivalo zesango lesikhululo samandla obushushu. Esi sixhobo sinokukhethwa kwi-sphere yeevalvu zebhola ezivaliweyo.
(9) Carbide. Ineempawu ezintle ezibanzi ezifana nokuxhathisa umhlwa, ukuxhathisa ukhukuliseko kunye nokumelana nokukrweleka, kwaye inobomi obude benkonzo. Yinto efanelekileyo yokutywina. Isetyenziswa ngokuqhelekileyo i-tungsten drill alloy kunye ne-drill base alloy surfacing electrode, njl., inokwenza i-ultra-high, i-ultra-high ukutywina indawo yokushisa, ifanele i-oyile, i-oyile, igesi, i-hydrogen kunye nezinye imidiya.
(10) Tshaza ingxubevange ye-welding. Kukho i-cobalt-based alloys, i-nickel-based alloys, kunye ne-chin-based alloys, ezinokumelana nokugqwala okulungileyo kunye nokumelana nokunxiba.
Ukuze kuqinisekiswe ukhuseleko kunye nokuthembeka kwesitywina se-valve, izinto ezikhethiweyo kufuneka zinqunywe ngokwemiqathango ethile yokusebenza. Ukuba i-medium yonakalisa kakhulu, xa ukhetha izinto eziphathekayo, kufuneka ihlangabezane nokusebenza okutshabalalisayo ekuqaleni, kwaye emva koko ihlangabezane neemfuno zezinye iipropati; Isitywina sevalve yesango kufuneka sinikele ingqalelo ekuchaseni kakuhle kokukrwela; Iivalve zokhuseleko, i-throttle valves kunye ne-valve elawulayo zichithwa ngokulula ngumbindi, kwaye izinto ezinokumelana nokubola kakuhle kufuneka zikhethwe; Kwisakhiwo esifakwe kwindandatho yokutywina kunye nomzimba, izinto ezinobunzima obuphezulu kufuneka zithathwe njengento yokutywina; Iivalvu ngokubanzi ezinobushushu obuphantsi kunye noxinzelelo kufuneka zikhethe irabha kunye neplastiki esebenza kakuhle njengokutywinwa; Xa ukhetha izinto zokutywina, kufuneka kuqatshelwe ukuba ubunzima bobuso besihlalo se-valve kufuneka bube buphezulu kunobutywina be-disc ye-valve.
Ixesha lokuposa: Nov-02-2022