Nchumu wo pfalela ti valve i xiphemu xa nkoka xa ku pfalela ti valve. Hi swihi switirhisiwa swo pfalela valve? Ha switiva leswaku switirhisiwa swa ring yo pfala valve swi avanyisiwile hi swiyenge swimbirhi: nsimbi na leswinga riki swa nsimbi. Leswi landzelaka i xingheniso xo koma xa swiyimo swa matirhiselo ya switirhisiwa swohambana hambana swo pfalela, xikan’we na tinxaka ta ti valve leti tirhisiwaka ngopfu.
1. Raba yo endliwa
Swihlawulekisi leswi heleleke swa rhaba ya synthetic swofana na ku tiya ka oyili, ku tiya ka mahiselo xikan’we naku lwisana na corrosion swa antswa kutlula swa rhaba ya ntumbuluko. Hi ntolovelo, mahiselo ya matirhiselo ya rhaba yo endliwa i t≤150°C, naswona mahiselo ya rhaba ya ntumbuluko i t≤60°C.Rubber yi tirhisiwa ku pfala ti globe valves, .valve ya gede leyi tshameke hi rhaba, tivalvu ta diaphragm, .ruber seated phaphatani valve, ruber yi tshamile swing check valve (ti valve to kambela), ti pinch valves na ti valve tin’wana letingana ntshikelelo wa vito PN≤1MPa.
2. Nayiloni
Nylon yina swihlawulekisi swa friction coefficient leyintsongo xikan’we naku tiya ka kahle eka corrosion. Nylon yitirhisiwa ngopfu eka ti ball valves na ti globe valves letingana mahiselo ya t≤90°C na ntshikelelo wa vito PN≤32MPa.
3. PTFE
PTFE yi tirhisiwa ngopfu eka ti globe valve, .ti valve ta gede, ti valve ta bolo, na swin’wana na mahiselo ya t≤232°C na ntshikelelo wa vito PN≤6.4MPa.
4. Nsimbi leyi hoxiweke
Nsimbi leyi hoxiweke yi tirhisiwa ekavalve ya gede, valve ya globe, valve ya plug, na swin’wana swa mahiselo t≤100°C, ntshikelelo wa vito PN≤1.6MPa, gasi na oyili.
5. Xihlanganisi xa Babbitt
Babbitt alloy yitirhisiwa eka ammonia globe valve leyingana mahiselo ya t-70~150°C na ntshikelelo wa vito PN≤2.5MPa.
6. Xihlanganisi xa koporo
Switirhisiwa leswi tolovelekeke swa ti copper alloys i 6-6-3 tin bronze na 58-2-2 manganese brass. Copper alloy yina ku tiya ka kahle ka ku onhaka naswona yi lulamerile eka mati na steam na mahiselo ya t≤200°C na ntshikelelo wa vito PN≤1.6MPa. Hakanyingi yi tirhisiwa ekati valve ta gede, tivalvu ta globe, .ti valve to kambela, ti- valve ta tiplagi, na swin’wana.
7. Chrome ya nsimbi leyi nga riki na swilo swo bola
Ti grade leti tirhisiwaka ngopfu ta chromium stainless steel i 2Cr13 na 3Cr13, letinga timiwa naku titimela, naswona tina ku tiya ka kahle eka corrosion. Yitala kutirhisiwa eka ti valve ta media yofana na mati, steam na petroleum na mahiselo ya t≤450°C na ntshikelelo wa vito PN≤32MPa.
8. Chromium-nickel-titanium nsimbi leyi nga riki na swilo swo bola
Giredi leyi tirhisiwaka ngopfu ya chromium-nickel-titanium stainless steel i 1Cr18Ni9ti, leyingana ku tiya ka kahle ka corrosion, ku tiya ka erosion xikan’we naku lwisana na kuhisa. Yi lulamerile eka steam, nitric acid na swin’wana swa switirhisiwa leswingana mahiselo t≤600°C na ntshikelelo wa vito PN≤6.4MPa, leyi tirhisiwaka eka globe valve, ball valve, na swin’wana.
9. Nsimbi leyi nga ni nitrided
Giredi leyi tirhisiwaka ngopfu ya nsimbi ya nitrided i 38CrMoAlA, leyingana ku tiya ka kahle ka corrosion xikan’we naku lwisana na scratch endzhaku ka vutshunguri bya carburizing. Hi ntolovelo yitirhisiwa eka valve ya gede ya xitichi xa gezi leyingana mahiselo t≤540°C na ntshikelelo wa vito PN≤10MPa.
10. Ku boroniza
Boronizing yi lulamisa hiku kongoma ndzhawu yo pfalela kusuka eka swilo swa miri wa valve kumbe miri wa disc, kutani yi endla vutshunguri bya boronizing surface, ndzhawu yo pfalela yina ku tiya ka kahle ka ku onhaka. Yi tirhisiwa eka valve yo pfurha ya xitichi xa gezi.
Nkarhi wa poso: Jun-10-2022
