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 nokungagugi.
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