I-Valve Seat kanye ne-Seat Ring Material Guide for Check Valve & Ama-Industrial Control Valves 

Isihlalo se-valve nendandatho yesihlalo yizici ezibalulekile zokuvala ama-valve okuhlola kanye nama-valve okulawula izimboni. Ukukhethwa kwezinto ezingalungile kuholela ekugugulekeni ngaphambi kwesikhathi, ukulimala kwe-cavitation, i-metal galling kanye nokuvuza kwangaphakathi okuqhubekayo, okubangela ukuphumula okungahleliwe kwepayipi kanye nezindleko eziphezulu zokulondoloza. Lo mhlahlandlela uhlanganisa ukwakheka kwesihlalo se-valve, izindlela zokwehluleka ezivamile, ukuqhathaniswa kwezinto ezibonakalayo phakathi kwensimbi engagqwali nama-Stellite alloys, izindinganiso zokutshala izimali kanye nezidingo zemishini engaphezulu, ukusiza onjiniyela namathimba okuthengwa kwempahla ukukhetha isihlalo sevalvu esifanele, iringi yesihlalo kanye nokufakwa kwevalvu kuwoyela negesi, amakhemikhali kanye nesevisi yesitimu.

1. Uhlolojikelele Lwesihlalo Sevalve & Nendandatho Yesihlalo Kuma-Check Valves

1.1 Incazelo kanye Nomehluko Wesakhiwo

Lesi sigaba siyaphendula: Uyini umehluko phakathi kwesihlalo sevalvu, iringi yesihlalo kanye nokufakwa kwevalvu? Lezi zingxenye zidlala yiphi indima ekuvaleni ama-valve esheke?

• Isihlalo se-valve: Isisekelo sokuvala esingaguquki esihlanganisiwe noma esicindezelwe emzimbeni we-valve, okwenza ukuthintana okuyisisekelo kokuvala nge-valve disc noma ibhola.
• Indandatho yesihlalo (hlola indandatho yevalvu): Into efakwe emise okwendandatho eshintshwayo efakwe phezu kwesihlalo; isebenza njengendawo yokubeka uphawu yomhlatshelo ukuvikela umzimba we-valve ekugugeni.
• Faka i-valve: Ibhande lokuvala eliwumngcingo elifakwe eringini yesihlalo, ngokuvamile elinobuso obuqinile nge-Stellite alloy ukuze lisebenze kanzima.

Swayipha ama-valve okuhlola futhi uphakamise ama-valve okuhlola thatha izakhiwo zezihlalo ezahlukene. Amavalvu okuhlola aphakamisa afaka ibhande lesihlalo eliyisicaba, eliwumngcingo, kuyilapho amavalvu okuhlola ama-swing esebenzisa ubuso besihlalo obumise okwe-arc. Konke ukusebenza kokutywinwa kwensimbi kuya kwensimbi kuncike ngokuphelele kwikhwalithi yento ebonakalayo kanye nokunemba komshini kwalezi zingxenye ezintathu.

1.2 Imiphumela Yokungaphumeleli Kwezihlalo

Uma indawo yokuvala isihlalo yonakele, i-valve ayikwazi ukuvimba ukugeleza okubuyela emuva ngokuphumelelayo. Imiphumela evamile ihlanganisa ukuvuza okuphakathi okuqhubekayo, ukuncipha kwengcindezi kancane kancane, nokufakwa kabusha kwamavalvu agcwele phakathi nezinyanga esikhundleni seminyaka.

2. Izindlela Zokwehluleka Ezivamile Zesihlalo Sevalve & Nendandatho Yesihlalo

Lesi sigaba sichaza kuphela izindlela zokwehluleka ngaphandle kokwethula izixazululo zezinto ezibonakalayo.

2.1 I-Erosion Wear (I-Particle Impingement & Wire Drawing)

Uketshezi lwejubane eliphezulu oluthwele izinhlayiya eziqinile lusika imisele eqondile ebusweni obuvalekayo. Lesi simo saziwa ngokuthi ukudweba ngocingo, futhi sivamise ukwenzeka esitiyeni esinomfutho ophezulu kanye namapayipi aludaka. Izinhlayiya eziqinile eziqinile zikhiqiza ukuguga komthelela olimazayo, kancane kancane zisuse into ebhande lesihlalo.

2.2 Ukulimala kwe-Cavitation (Ukubanika nokugoqa kwebhamuza)

Lapho umfutho woketshezi wehla ngaphansi komfutho womhwamuko, uketshezi lukhanya kumabhamuza omhwamuko. Lawa mabhamuza adilika ngobudlova lapho ingcindezi ibuya, akhiqize ama-shockwaves asendaweni adala umonakalo we-pitting kanye ne-crater endaweni yesihlalo sensimbi. I-Cavitation isabalele kuma-valve okulawula ukudonsa kanye nama-valve okuhlola ingcindezi ephezulu.

2.3 I-Galling & Adhesive Wear Endaweni Yokuvala Ngensimbi

Lapho izindawo ezimbili zensimbi ezingenalutho zivuleka ngokuphindaphindiwe futhi zivaleka ngaphansi kwengcindezi ephezulu yokuxhumana, ukushisela okubandayo kwenzeka phakathi kwamaphuzu okuxhumana. Impahla idabuka endaweni eyodwa futhi inamathele ebusweni bokukhwelana, yenze umonakalo ongapheli wokuquleka. Amapheya ensimbi engagqwali athambekele kakhulu ekugalweni ngaphandle kokwelashwa kwe-hardfacing.

3. Main Metal Materials for Hlola Valve Seat & Seat Ring

3.1 316L Stainless Steel (CF3M/F316L) – General Corrosion Service

• Ukuqina: Cishe ama-25 HRC asesimweni sokungenwa.
• Izinzuzo: Ukumelana okuhle kakhulu nokugqwala okujwayelekile kanye nokugqwala kwe-chloride; izindleko eziphansi; lula utshalomali Casting kanye machining.
• Ukulinganiselwa: Ukungagugi kahle; ayikwazi ukumelana nokuguguleka, i-cavitation noma i-galling ngaphansi kwengcindezi ephezulu.
• Isevisi efanele: Amanzi ahlanzekile, uketshezi oludlayo oluncane, amapayipi omoya anomfutho ophansi angenazo izinhlayiya eziqinile.

3.2 420 I-Martensitic Stainless Steel – Isevisi Yokugqoka Okumaphakathi

• Ukuqina: 38–42 HRC ngemva kokucisha nokushisa.
• Izinzuzo: Ukuqina okuphezulu kuno-316L; ukusebenza okungcono kwe-anti-wear; ezithengekayo zesevisi ye-medium-duty.
• Ukulinganiselwa: Ukumelana ne-cavitation okulinganiselwe; isajwayele ukuba nenyongo uma ibhangqwe nobunye ubuso bensimbi engagqwali obungu-420.
• Isevisi efanelekile: Uketshezi olungancibilikiyo olunomfutho ophansi, amavalvu okuhlola acishiwe anomjikelezo ophansi.

3.3 I-Stellite Alloys (I-Stellite 6 / I-Stellite 12) – Isevisi Yokuguguleka Okukhulu kanye Nesevisi Yezimbobo

I-Stellite iyingxube ye-cobalt-chromium-tungsten isetshenziswa kabanzi njengembondela yobuso obuqinile kuma-substrates ezihlalo zensimbi engagqwali.

I-Stellite 6 (Ibanga Elijwayelekile Lemboni)

• Ukuqina: 36–45 HRC ngemva kwembondela yokushisela.
• Ukusebenza okubalulekile: Ukumelana okuvelele ku-cavitation, ukuguguleka komhlabathi kanye ne-metal galling; igcina ubulukhuni obuningi obufika ku-500°C isevisi yesitimu esisezingeni eliphezulu.
• Isicelo: Isitimu esinengcindezi ephezulu, i-slurry emaphakathi, ama-valve okuhlola ama-high-cycle modulating kanye nama-valve okulawula.

I-Stellite 12 (Ibanga Le-High-Wear)

• Ukuqina: 45–53 HRC enokuqukethwe kwekhabhoni ephezulu.
• Ukuhwebelana: Ukumelana nokuhuzuka okuphezulu kodwa ukuqina okuphansi kune-Stellite 6; kuthambekele kakhulu ekuqhekekeni ngaphansi komthelela osindayo.
• Isicelo: Udaka olubi olubi nezimo zokuguguleka okukhulu.

4. Izidingo Ezibalulekile Zokukhiqiza Nomshini

4.1 Amaphuzu Abalulekile Wokutshala Utshalomali Okufakwa Kwezihlalo Zevalvu

Amaringi amaningi ezihlalo zama-valve kanye nezinto ezifakwayo akhiqizwa nge i-silica sol investment casting, ikakhulukazi i-316L ne-Stellite alloy components.

• Lawula ukushwabana kwe-porosity kanye nokuklebhuka okushisayo eduze kwebhande lokuvala ngokuthuthukisa i-gating kanye nesakhiwo esibandayo; gwema ukufaka amaphutha endaweni yokuvala okubalulekile.
• Susa ngokuphelele izinsalela zegobolondo le-ceramic ngaphambi komshini; isihlabathi esisele sizodala ukuguga ngaphambi kwesikhathi ngesikhathi sokuxhawula.
• Faka ukwelashwa kokushisa kokunciphisa ingcindezi ngemva kokusakazwa ukuze uvimbele ukuwohloka kwe-dimensional ngaphansi kwezinguquko zezinga lokushisa elijikelezayo.
• Ukuhlolwa kwe-NDT: Yenza ukuhlolwa kwe-penetrant (PT) kanye nokuhlolwa kwe-radiographic (RT) emasongweni ezihlalo aqediwe ukuze kutholwe ukushwabana kwangaphakathi nokuqhekeka kwendawo.

4.2 Izinga Lokuqina Lokuvala Indawo

• Izihlalo zensimbi engagqwali ezingagcotshiwe kufanele zihlangabezane nobulukhuni benqwaba obucacisiwe; i-mating disc face kufanele ibe nomehluko wobulukhuni okungenani obungu-5 HRC ukuze kuncishiswe ingcuphe ye-galling.
• I-Stellite hardfacing overlay ukujiya kulawulwa ku-2-4 mm ngemuva komshini wokuqeda; ubulukhuni kufanele buhlolwe ngqo ebhandeni lokuvala elinobuso obuqinile, hhayi ku-substrate yensimbi engagqwali.
• Isevisi kawoyela omuncu negesi (NACE MR0175): Imikhawulo yokuqina iyasebenza ukuze kugwenywe ukuqhekeka kokucindezeleka kwe-sulfide; I-Stellite 6 ifanelekela isevisi yegesi emuncu ngokulawula ubulukhuni obufanele.

4.3 Izidingo Zokuqedwa Okuphezulu Nezinqenqema Zezihlalo Zensimbi

Ubulukhuni bobuso buthinta ngokuqondile ukuqina kokuvala nempilo yesevisi.

• Ibhendi yezihlalo ezenziwe ngomshini: I-Ra 0.8–1.6 μm yamavalvu okuhlola ahlala ngensimbi evamile.
• Ubuso obuvalekile obufakwe uphawu be-Class V/VI zero-leakage shutoff (isigaba ngasinye sokuvuza kwevalvu ye-API): U-Ra 0.2–0.8 μm onokuvuleka okulawulwa ngaphakathi kwamabhendi okukhanya angu-2 (0.0005 mm).
• Gwema ukuqhunyiswa kobuhlalu noma ukuwa ngemva komshini wokugcina; ukuqhuma kudala ukuthungwa kwendawo engalingani futhi kufinyeze ukuphila kwezihlalo.
• I-Precision lapping iyadingeka I-Stellite Valve Ball kanye namapheya okukhwelana kweSitulo ukuze uthole ukuthintana okufanayo phakathi nobubanzi obugcwele besihlalo.

5. Izimiso Zokukhetha Izinto Ngokwesimo Sesevisi

Lesi sahluko siletha imithetho yokukhetha engenziwa ngaphandle kokuphinda idatha yokusebenza kwezinto ezibonakalayo.

5.1 Hlanza Ukugqwala Okumaphakathi & Okumaphakathi

Okumaphakathi: Amanzi ahlanzekile, i-hydrocarbon ehlanzekile enezinga lokushisa eliphansi, igesi enomfutho ophansi ongenazo izinhlayiya eziqinile.
Izinto ezinconyiwe: Isihlalo sevalvu yensimbi engagqwali engu-316L eqinile neringi yesihlalo. Ayikho i-Stellite hardfacing edingekayo ukuze ulawule izindleko zokuthenga.

5.2 I-High-Pressure Steam & Erosive Fluid

Okumaphakathi: Isitimu esigcwele futhi esishise kakhulu, uketshezi olunezinhlawulo eziqinile ezithambile, isivinini sokugeleza okuphezulu.
Izinto ezinconyiwe: I-substrate engu-316L ene-Stellite 6 hardfacing ebhandeni lokuvala, ukumelana nokuguguleka komdwebo wezintambo kanye ne-oxidation yezinga eliphezulu lokushisa.

5.3 Isevisi ye-Cavitation & Flashing

Okumaphakathi: Ukucindezela okuphezulu komehluko, uketshezi olukhanyayo, ukuwa kwebhamuza okuvamile.
Izinto ezinconyiwe: Isihlalo se-Stellite 6 esiyimbondela; I-cobalt-based alloy inikeza ukumelana okungcono kakhulu kwe-cavitation kune-martensitic stainless steel.

5.4 Isevisi ye-Sour Oil & Gas (Imikhawulo ye-NACE MR0175)

Okumaphakathi: I-H₂S equkethe igesi engahluziwe nemvelo emuncu.
Umthetho obalulekile: Lawula ubulukhuni besihlalo ngaphansi komkhawulo ophezulu oshiwo we-NACE; I-Stellite 6 hardfacing ihlangabezana nezinga le-NACE MR0175 / ISO 15156 lokumelana nokuqhekeka kwe-sulfide stress. Gwema izimbondela ze-weld ezinokuqina okuphezulu okungalawuleki.

6. Imibuzo Evame Ukubuzwa

6.1 I-Stellite Valve Seat vs 316L: Iyiphi Enokuphila Okude Kwesevisi?

Izihlalo ezinobuso obuqinile be-Stellite ziletha impilo yesevisi ende kakhulu kunezihlalo ezingenalutho ezingu-316L ngaphansi kwezimo ze-steam, cavitation nezimo zokuguguleka. Ngesevisi ehlanzekile enengcindezi ephansi, i-316L inikeza impilo eyanele ngezindleko zangaphambili eziphansi.

6.2 Ingabe I-Stellite Hardfacing Ingasetshenziswa Ensizakalweni Yegesi Emuncu?

Yebo. I-Stellite 6 ihambisana ne-NACE MR0175 / ISO 15156 lapho ubulukhuni be-weld kulawulwa ngokuqinile, okuyenza ibe yinto evamile yokunquma uwoyela omuncu namavalvu okuhlola igesi.

6.3 Buyini Ukuqina Okudingekayo Kwendandatho Yesihlalo Sevalve?

• Isihlalo esiqinile esingu-316L: 22–28 HRC (isimo esifakiwe).
• 420 isihlalo sensimbi engagqwali: 38–42 HRC ngemva kokwelashwa ukushisa.
• Isihlalo esinobuso obuqinile be-Stellite 6: 36–45 HRC ikalwa endaweni eyimbondela.

7. Isiphetho & Isifinyezo Sokukhetha

Umgomo oyinhloko wesihlalo se-valve nokukhethwa kwezinto zendandatho yesihlalo ufanisa ukusebenza kwe-alloy nemodi yokwehluleka evelele:

1. Ukuze uthole amapayipi ahlanzekile, agqwalile kancane: Khetha ukufakwa kwevalvu yensimbi engagqwali engu-316L eqinile kanye neringi yesihlalo ukuze wonge izindleko.
2. Ngesitimu esinengcindezi ephezulu, ukuguguleka kwezinhlayiyana kanye nesevisi ye-cavitation: Cacisa I-Stellite 6 hardfacing kuma-substrates angu-316L.
3. Ngesevisi yegesi emuncu: Landela imikhawulo yokuqina ye-NACE MR0175 bese ukhetha imbondela ye-Stellite efanelekayo.
4. Njalo qinisekisa ikhwalithi yokusakaza, ukuphela kwendawo kanye nobulukhuni bobuso bokuvala ngaphambi kokwamukelwa.

Lapho uhlola isihlalo sevalvu yokuhlola ngokwezifiso, indandatho yesihlalo kanye ne-Stellite Valve Ball kanye nezihlalo zamasistimu oketshezi lwezimboni, qinisekisa inqubo yokusakaza, ukucaciswa kwe-hardfacing kanye nezindinganiso zokuxega nomphakeli wakho wengxenye ukuze ugweme ukwehluleka ukuvala ngaphambi kwesikhathi.