Setulo sa valve ea butterflyke karolo e ka tlosoang ka hare ho valve, karolo e ka sehloohong ke ho tšehetsa poleiti ea valve e bulehile ka ho feletseng kapa e koetsoe ka ho feletseng, 'me e etsa motlatsi oa ho tiisa. Hangata, bophara ba setulo ke boholo ba caliber ea valve. Lisebelisoa tsa setulo sa li-valve tsa butterfly li pharaletse haholo, lisebelisoa tse sebelisoang hangata ke ho tiisa EPDM, NBR, PTFE, le lisebelisoa tsa tšepe tse thata tse tiisang carbide. E latelang re tla hlahisa ka bonngoe.
1.EPDM-Ha e bapisoa le rabara e meng e akaretsang, rabara ea EPDM e na le melemo e meholo, haholo-holo e bontšoang ka:
A. E theko e boima haholo, libanana tse sebelisoang hangata, tiiso ea rabara e tala ea EPDM e bobebe ka ho fetisisa, u ka etsa ho tlatsa haholo, ho fokotsa litšenyehelo tsa rabara.
B. EPDM lintho tse bonahalang tse hanyetsanang le botsofali, ho mamella ho pepeseha ha letsatsi, ho hanyetsa mocheso, ho hanyetsa mouoane oa metsi, ho hanyetsa mahlaseli, ho loketse bakeng sa acid e fokolang le mecha ea alkali, thepa e ntle ea ho pata.
C. Mefuta ea mocheso, e tlaase ka ho fetisisa e ka ba -40 ° C - 60 ° C, e ka ba 130 ° C maemo a mocheso bakeng sa tšebeliso ea nako e telele.
2.NBR-oli e hanyetsanang le mocheso, e thibelang mocheso, ho apara 'me ka nako e ts'oanang e na le ho thibela metsi hantle, ho tiisa moea le thepa e babatsehang ea ho tlamahane. Lits'ebetso tse ling liphaepheng tsa oli, bofokoli ke hore ha e hanyetsane le mocheso o tlase, ho hanyetsa ozone, thepa e fokolang ea ho kenya letsoho, elasticity le eona ke kakaretso.
3. PTFE: polasetiki ea fluorine, thepa ena e na le ho hanyetsa ka matla ho acid le alkali, kang tse fapa-fapaneng manyolo solvents tshebetso, ha thepa e phahameng mocheso ho hanyetsa, e ka sebelisoa ka ho tsoelang pele ka 260 ℃, mocheso phahameng ka ho fetisisa ka fihla 290-320 ℃, PTFE a hlaha, ka katleho ho rarolla indasteri ea lik'hemik'hale, peterole, mathata a mangata masimong a indasteri ea meriana le mathata a mang a indasteri.
4. Metal hard seal (carbide): tšepe e thata ea seal valve setulo se na le khanyetso e ntle haholo ho mocheso o phahameng le khatello e phahameng, ho hanyetsa kutu, ho apara litšoaneleho tsa ho hanyetsa, ho molemo haholo ho etsa litšitiso tsa thepa e tiileng ea ho tiisa ha e hanyetsane le mocheso o phahameng le khatello e phahameng, empa thepa ea tiiso e thata mabapi le litlhoko tsa ts'ebetso ea ts'ebetso e phahame haholo, bothata bo le bong feela bo nang le bothata ba nako e telele ea ho tiisa setulo e tla ba bofokoli ba nako e telele. ts'ebetso ea mosebetsi oa ho lutla.