Valve Seat uye Seat Ring Material Guide yeCheck Valve & Industrial Control Mavharuvhu 

Chigaro chevhavha uye mhete yechigaro ndizvo zvakakosha zvekuisa chisimbiso zvikamu zvecheki mavharuvhu uye mavharuvhu ekudzora maindasitiri. Kusarudzwa kwezvinhu zvisina kunaka kunotungamira mukukukurwa nguva isati yakwana, kukuvadzwa kwecavitation, simbi galling uye kuenderera kwemukati kuvuza, izvo zvinokonzeresa isina kurongeka yekudzikira kwepombi uye mitengo yakakwira yekuchengetedza. Iri gwara rinovhara chimiro chechigaro chevharuvhu, maitiro ekutadza, kuenzanisa kwezvinhu pakati pesimbi isina tsvina neStellite alloys, mari yekukanda zviyero uye pamusoro pemachining zvinodiwa, kubatsira mainjiniya nezvikwata zvekutenga zvinhu kutora chigaro chevharuvhu chaiyo, mhete yechigaro uye kuisa vharafu yemafuta & gasi, kemikari uye sevhisi yemhepo.

1. Mhedziso yeValve Seat & Seat Ring muCheck Valves

1.1 Tsanangudzo uye Kusiyana Kwemaitiro

Ichi chikamu chinopindura: Ndeupi musiyano uripo pakati pechigaro chevharuvhu, mhete yechigaro uye kuisa valve? Ibasa rei rinoita zvikamu izvi pakuvhara mavharuvhu?

• Chigaro chevhavha: Iyo yakagadziriswa chisimbiso chisimbiso chakabatanidzwa kana kumanikidzwa mukati memuviri wevhavha, iyo inoumba yekutanga chisimbiso kusangana nevhavha disc kana bhora.
• Seat mhete (tarisa valve mhete): A inotsiviwa rin'i-chimiro chinoisa yakaiswa pamusoro pechigaro bore; inoshanda sechibairo chekuisa chisimbiso chepamusoro kuchengetedza muviri wevharuvhu kubva pakupfeka.
• Kuisa valve: Bhandi rakamanikana rekuvharisa rakagadzirwa pachigadziko chechigaro, kazhinji rakaomeswa neStellite alloy yebasa rakaoma.

Swing cheki mavharuvhu uye simudza cheki mavharuvhu tora zvivakwa zvezvigaro zvakasiyana. Simudza cheki mavharuvhu ane bhendi rakati sandara, rakamanikana, ukuwo mavharuvhu echeki anoshandisa chiso chechigaro chakafara chakaita searc. Yese simbi-kune-simbi yekuisa chisimbiso kuita kunoenderana zvachose nemhando yezvinhu uye machining chaiwo ezvikamu zvitatu izvi.

1.2 Mhedzisiro yeKutadza Kwechigaro

Kamwe chigaro chekuisa chisimbiso chepamusoro chakuvadzwa, vharuvhu haigone kuvharira kuyerera kwemashure zvinobudirira. Migumisiro yakajairika inosanganisira kuenderera kwepakati kuvuza, kuderera zvishoma nezvishoma, uye kutsiva yakazara vharafu mukati memwedzi pane makore.

2. Common Failure Modes yeValve Seat & Seat Ring

Ichi chikamu chinotsanangura chete nzira dzekukundikana pasina kuunza zvigadziriso zvezvinhu.

2.1 Erosion Wear (Particle Impingement & Wire Drawing)

High-velocity fluid inotakura zvimedu zvakasimba inocheka mitsetse yemitsetse pachiso chinosunga. Chiitiko ichi chinozivikanwa sekudhirowa kwewaya, uye chinowanzoitika mumhepo-inotsikirira chiutsi uye mapaipi ane slurry. Zvimedu zvakaomarara zvinogadzira abrasive kukanganisa kupfeka, zvishoma nezvishoma kubvisa zvinhu kubva pabhendi rechigaro.

2.2 Kukuvadzwa kweCavitation (Kupenya & Kudonha kweBubble)

Kana dzvinyiriro yemvura inodonha pasi pemhepo yemhute, mvura inopenya mumhute. Mafuro aya anodonha zvine chisimba kana dzvinyiriro ikadzora, zvichigadzira mavhuvhu emumhepo akakwira anokonzeresa kukuvadzwa kwegomba pachigaro chesimbi. Cavitation yakapararira mu throttling control valves uye high differential pressure check valves.

2.3 Galling & Adhesive Wear pane Metal Seiling Surfaces

Kana maviri asina simbi epamusoro achivhurika uye achivharika pasi pekudzvinyirirwa kukuru, kutonhora kunoitika pakati penzvimbo dzekusangana. Material anobvarura kubva pane imwe nzvimbo uye anonamira kuchiso chekubatana, achigadzira kukuvara zvachose kwekubatwa. Stainless simbi pairs vanonyanya kukurumidza kuita galling pasina hardfacing kurapwa.

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

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

• Kuoma: Inenge 25 HRC mune annealed mamiriro.
• Zvakanakira: Kupokana kwakanakisa kune general corrosion uye chloride corrosion; mutengo wakaderera; nyore kuisa mari kukanda uye machining.
• Zvisingakwanisi: Kusagadzikana kupfeka kusagadzikana; haigone kuramba kukurwa, cavitation kana galling pasi pekumanikidzwa kwakanyanya.
• Yakakodzera sevhisi: Mvura yakachena, yakapfava inoodza mvura, yakaderera-inotsikirira mhepo pombi isina zvimedu zvakasimba.

3.2 420 Martensitic Stainless Simbi – Medium Wear Service

• Kuoma: 38-42 HRC mushure mekudzima uye kupisa.
• Zvakanakira: Kuoma kwepamusoro kupfuura 316L; zviri nani anti-kupfeka kuita; inokwanisika kubasa repakati-kati.
• Limitations: Limited cavitation resistance; ichiri kuda kuita huturu kana yapetwa neimwe 420 simbi isina tsvina.
• Inokodzera sevhisi: Yakaderera-kudzvanya isina-abrasive fluid, yakaderera-cycle on-off cheki mavharuvhu.

3.3 Stellite Alloys (Stellite 6 / Stellite 12) - Kukura kweErosion & Cavitation Service

Stellite ndeye cobalt-chromium-tungsten alloy Inoshandiswa zvakanyanya seyakaomesesa yakafukidzwa pane Stainless simbi chigaro substrates.

Stellite 6 (Industry Standard Giredhi)

• Kuoma: 36-45 HRC mushure mekuputira pamusoro.
• Kuita kwakakosha: Kupokana kwakasarudzika kune cavitation, kuvhuvhuta uye simbi galling; inochengetedza kuomarara kwakawanda kusvika ku500°C high-tembiricha ye steam.
• Kushandisa: High-pressure steam, moderate slurry, high-cycle modulating check valves uye mavharuvhu ekudzora.

Stellite 12 (High-Wear Giredhi)

• Kuoma: 45–53 HRC ine yakakwira kabhoni yemukati.
• Kutengeserana-kure: Yakakwira abrasion kuramba asi yakaderera kuoma kupfuura Stellite 6; inowanzoita kuputika pasi pesimba rinorema.
• Application: Yakanyanya abrasive slurry uye inorema erosion mamiriro.

4. Key Manufacturing & Machining Zvinodiwa

4.1 Investment Kukanda Mapoinzi Akakosha eValve Seat Insets

Mazhinji mavharuvhu ezvigaro zvindori uye zvinoiswa zvinogadzirwa kuburikidza silica sol investment casting, kunyanya ye316L uye Stellite alloy components.

• Dzora shrinkage porosity uye kupisa kubvarura pedyo nebhendi yekuisa chisimbiso nekugadzirisa gating uye chill marongerwo; dzivisa kukanda kukanganisa panzvimbo yakakosha yekuisa chisimbiso.
• Bvisa zvakazara ceramic shell residue usati wagadzira; jecha rasara rinokonzeresa kupera nguva isati yakwana panguva yekukwenya.
• Isa kushushikana kwekudziya kupisa kurapwa mushure mekukanda kudzivirira dimensional deformation pasi pe cyclic tembiricha shanduko.
• NDT yekuongorora: Ita penetrant test (PT) uye radiographic test (RT) pane zvakapedzwa zvindori zvechigaro kuti uone shrinkage yemukati uye kuputika kwepamusoro.

4.2 Kuoma Chiyero cheKuvharisa Nzvimbo

• Zvigaro zvesimbi zvisina kuvharwa zvinofanirwa kusangana nekuomarara kwakawanda; iyo mating disc face inofanirwa kuve nekuoma kwakasiyana kweinenge 5 HRC kuderedza galling njodzi.
• Stellite hardfacing overlay ukobvu inodzorwa pa 2-4 mm mushure mekupedza machining; kuomarara kunofanira kuedzwa zvakananga pane yakaomeswa chisimbiso bhendi, kwete pane Stainless simbi substrate.
• Oiri yakasvibirira & gasi sevhisi (NACE MR0175): Kuomarara miganhu kunoshanda kudzivirira sulfide kusagadzikana kupaza; Stellite 6 inokodzera kuita sevhisi gasi sevhisi ine kwakaringana kuomarara kutonga.

4.3 Surface Pedzisa & Lapping Zvinodiwa zveSimbi Zvigaro

Kushata kwepamusoro kunokanganisa zvakananga kusimba kwekuvhara uye hupenyu hwesevhisi.

• Bandi rechigaro rakagadzirwa: Ra 0.8–1.6 μm kune general metal-seated check valves.
• Chiso chakavharwa chisimbiso cheClass V/VI zero-leakage shutoff (per API valve leakage classification): Ra 0.2–0.8 μm nekudzika kunodzorwa mukati me2 mabhendi emwenje (0.0005 mm).
• Dzivisa kuputika kwebhedhi kana kudonha mushure mekugadzira kwekupedzisira; kuputika kunogadzira kusaenzana kwepamusoro uye kunopfupisa hupenyu hwechigaro.
• Precision lapping inosungirwa Stellite Valve Bhora uye Seat mating pairi kuwana yunifomu kuonana mhiri yakazara chigaro upamhi.

5. Kusarudzwa kwezvinhu Mitemo neMamiriro Ebasa

Ichi chitsauko chinopa maitiro ekusarudza mitemo pasina kudzokorora yakazara data performance performance data.

5.1 Yakachena Pakati & Mild Corrosion

Pakati: Mvura yakachena, yakadzika-tembiricha yakachena hydrocarbon, yakaderera-kudzvanywa gasi isina zvidimbu zvakasimba.
Zvinokurudzirwa zvinhu: Solid 316L Stainless simbi valve chigaro uye chigaro mhete. Hapana Stellite hardfacing inodikanwa kudzora mutengo wekutenga.

5.2 High-Pressure Steam & Erosive Fluid

Pakati: Yakazara uye yakanyanyisa kupisa mupfu, mvura ine zvinyoro zvinyoro zvifaindi, kuyerera kwakanyanya.
Zvinhu zvinokurudzirwa: 316L substrate ine Stellite 6 hardfacing pabhendi rekuvharisa, kudzivirira kukukurwa kwewaya uye kupisa kwepamusoro oxidation.

5.3 Cavitation & Flashing Service

Pakati: Yakakwirira mutsauko kudzvinyirirwa, mvura inopenya, inogaroputsika bubble.
Zvinokurudzirwa zvinhu: Stellite 6 overlay chigaro kuisa; cobalt-based alloy inopa zvirinani cavitation kuramba pane martensitic Stainless simbi.

5.4 Sour Oiri & Gasi Service (NACE MR0175 Restrictions)

Pakati nepakati: H₂S-ine inovava isina kukora uye gasi rechisikigo.
Mutemo wakakosha: Kudzora kuoma kwechigaro pazasi peNACE inotsanangurwa yepamusoro muganhu; Stellite 6 hardfacing inosangana neNACE MR0175 / ISO 15156 yakajairwa ye sulfide kusagadzikana kupaza kuramba. Dzivisa kusingadzoreki yakakwirira-kuoma weld overlays.

6. Mibvunzo Inowanzo bvunzwa

6.1 Stellite Valve Seat vs 316L: Ndeipi Iine Hupenyu Hurefu Hwebasa?

Zvigaro zveStellite hardfaced zvinopa hupenyu hurefu hwesevhisi pane zvigaro zve316L zvisina zvigaro pasi peutsi, cavitation uye erosive mamiriro. Kune yakachena yakaderera-kudzvanywa sevhisi, 316L inopa hupenyu hwakakwana nemutengo wakaderera wepamberi.

6.2 Ko Stellite Hardfacing Inogona Kushandiswa muSour Gasi Sevhisi?

Hongu. Stellite 6 inoenderana neNACE MR0175 / ISO 15156 kana weld kuomarara kwakanyatso kudzorwa, zvichiita kuti ive yakajairwa trim zvinhu zveakavava oiri & gasi cheki mavharuvhu.

6.3 Chii Chinodiwa Kuoma Kwekutarisa Valve Seat Ring?

• 316L yakasimba chigaro: 22–28 HRC (annealed state).
• 420 chigaro chesimbi isina tsvina: 38-42 HRC mushure mekupisa kurapwa.
• Stellite 6 hardfaced seat: 36–45 HRC yakayerwa pamusoro pepamusoro pepamusoro.

7. Mhedziso & Sarudzo Summary

Iyo yakakosha musimboti wechigaro chevharuvhu uye chigaro chemhete yekusarudza zvinhu inoenderana nealloy kuita kune yakanyanya kutadza maitiro:

1. Kwemapaipi akachena, akaderera-asina ngura: Sarudza yakasimba 316L simbi isina tsvina yekuisa vharafu uye mhete yechigaro kuchengetedza mutengo.
2. Kune yakakwirira-kudzvanywa chiutsi, particle erosion uye cavitation service: Taura Stellite 6 hardfacing pane 316L substrates.
3. Yevhisi gasi sevhisi: Tevera NACE MR0175 kuomarara miganho uye sarudza inokwanisa Stellite overlay.
4. Gara uchiongorora kunaka kwekukanda, kupera kwepasi uye kuvharisa kuoma kwechiso usati wagamuchirwa.

Paunenge uchiongorora chigaro chekutarisa chevhavhavha, mhete yechigaro uye Stellite Valve Bhora uye Seat magungano emaindasitiri emvura masisitimu, simbisa maitiro ekukanda, kuomesesa kuomesesa uye kurovha zviyero nemupi wechikamu chako kudzivirira kutadza kuiswa chisimbiso nguva isati yakwana.