Cov qauv sib txawv li cas ntawm ntau lub rooj vag Wedge cuam tshuam rau kev ua tau zoo sealing thiab siv cov kev pabcuam?

Yuav Ua Li Cas Xaiv Qhov Zoo Qhov Rooj Qhov Rooj Rau Qhov Siab -Qhov Kub Hloov, Corrosive Media, lossis High Differential Pressure Scenarios?

 

I. Function thiab Basic Design Parameters ofNtug rooj vaghauv Gate Valves

Lub rooj vag li qub ua tiav cov dej ntawm / tawm tswj los ntawm kev nqa ntsug thiab txo qis ntawm lub rooj vag npoo. Lub sealing nto ntawm lub rooj vag qhov rooj tsim ib lub kaum ntse ntse nrog lub valve lub cev lub rooj zaum (feem ntau 2℃~ 5 degree, nrog 5℃pom zoo los ntawm API 600 tus qauv), tsim cov sealing tshwj xeeb los ntawm kev siv tshuab wedging force. Cov qauv sib txawv sib txawv ncaj qha cuam tshuam lub valve lub peev xwm los tiv thaiv thermal deformation, kev hloov pauv siab, thiab kev tshaj tawm xov xwm. Raws li 2022 kev tshaj tawm xov xwm ntawm Valve Manufacturers Association (VMA), ntau dua 70% ntawm lub rooj vag valve qhov chaw xau tsis ua haujlwm yog cuam tshuam rau qhov tsis zoo ntawm lub rooj vag qhov rooj xaiv.

 

II. Kev Ntsuam Xyuas Kom Paub Txog Peb Qhov Tseem Ceeb Ntawm Lub Rooj vag Wedge

1. Khoom siv

Cov yam ntxwv zoo: Monolithic wedge-zoo li tus tivthaiv tsim los ntawm casting los yog forging, nrog siab rigidity thiab tsis muaj qhov txav. Cov khoom siv xws li WCB carbon steel (-29℃~ 425 degree) lossis CF8M stainless hlau (-196℃~ 650 degree).

 

Siv tau Parameters:

• Chav Kawm Siab: Chav Kawm 150 ~ Chav Kawm 2500
• Sealing nto hardfaced nrog Stellite #6 (hardness HRC 38 ~ 42), muab kev ua haujlwm zoo heev.
• Lub kaum sab xis kam rau ua: ± 0.5℃(kev ua haujlwm raug raws li ASME B16.34).

 

Kev txwv: Nyob rau hauv cyclic kev khiav hauj lwm tej yam kev mob nrog ib tug kub sib txawv tshaj 100 degree, qhov sib txawv ntawm thermal expansion coefficients ntawm lub valve lub cev thiab wedge yuav ua rau wedging los yog sealing tsis ua hauj lwm. Cov kab nrib pleb yog rhiab heev rau cov kav dej bending kev nyuaj siab thiab tsis pom zoo rau qhov loj - bore (DN Ntau dua los yog sib npaug rau 300) cov kav dej nrog qhov kub thiab txias.

 

Ntev -tail Lo lus tseem ceeb kev koom ua ke: Thaum engineers xa musrooj vag valve wedge xaiv cov txheej txheem, khoom wedges feem ntau tsuas yog haum rau cov xov xwm huv si ntawm qhov kub thiab txias yam tsis muaj thermal shock (xws li dej, khoom siv roj).

 

2. Yooj yim rau wedge

Cov yam ntxwv zoo: Ib qhov nqaim circumferential groove (groove dav 0.8 ~ 1.5 mm) yog machined nyob rau hauv nruab nrab ntawm ib tug khoom wedge, los yog nws yog tsim rau hauv ib tug I-zoo li tus ntoo khaub lig-section, imparting circumferential elasticity rau lub rooj vag. Cov kev taw qhia zawj yog perpendicular mus rau cov kev taw qhia ntws, tso cai rau micro- deformation ntawm lub rooj vag (elastic deformation 0.1 ~ 0.3 mm) thaum kaw kom them nyiaj rau geometric deviations ntawm lub rooj zaum valve los ntawm thermal expansion lossis siab.

 

Cov ntaub ntawv tseem ceeb:

• Elastic them nyiaj muaj peev xwm: Withstands valve lub cev thermal deformation ntawm ± 1.5 mm / m (test standard per MSS SP-91).
• Ua haujlwm kub ntau: -29℃~ 538℃(thaum siv chrome-molybdenum steel).
• Hauv paus fillet vojvoog ntawm qhov zawj R Ntau dua lossis sib npaug li 3 hli kom tsis txhob muaj kev ntxhov siab (lub neej qaug zog> 2000 thermal cycles).

Kev lag luam Journal Citation: Ib qho kev xeem sib piv hauv lub Rau Hli 2021 qhov teeb meem ntawmValve ntiaj tebpom tau tias tom qab 500 thermal voj voog ntawm 200℃thiab ambient kub, sealing nto to ntawm cov wedges saj zawg zog nyob rau hauv qab ISO 5208 Rate A (0.1 ml / min / nti ntawm bore). Yog li ntawd,flexible wedge gate valve applicationstau dhau los ua kev lag luam thawj qhov kev xaiv rau cov kav dej nkev lossis siab - cov roj hluav taws xob kub.

3. Split Wedge / Ob Chav Wedge

Cov yam ntxwv zoo: Ua los ntawm ob lub rooj vag ywj pheej txuas nrog lub pob khawm kheej kheej lossis lub caij nplooj ntoos hlav, txhua lub phaj tuaj yeem ua viav vias ib ncig ntawm pob khawm sib cais. Thaum kaw, lub caij nplooj ntoos hlav los yog nruab nrab siab nias ob lub rooj vag daim hlau tiv thaiv lub rooj zaum ntawm ob sab, ua tiav kev sib dhos tsis siv neeg.

 

Advantage Parameters:

• Kev kam rau cov kav dej thermal deformation: ± 3 hli kab rov tav offset (tso cai tus nqi hauv API 600 Cov Ntawv Ntxiv E).
• Cov xov xwm siv tau: Particle- cov kua dej ua kua (xws li slurry, cov roj av xuab zeb), tso cai rau cov khoom hla dhau ntawm lub qhov rooj tshem tawm (1 ~ 2 hli) txhawm rau tiv thaiv kev sib tsoo.
• Adjustable sealing tshwj xeeb siab: Caij nplooj ntoos hlav preload feem ntau yog teem ntawm 15 ~ 30 N / mm².

 

Hom Failure Hom: Yog hais tias qhov nruab nrab yog corrosive heev, pob khawm pins yuav raug kev hnyav hnyav hnyav. Yog li ntawd,cais wedge corrosion{0}}cov ntaub ntawv tiv tausxws li duplex stainless hlau (2205) hinges yuav tsum tau xaiv.

 

III. Logical Progression rau xaiv Wedge Gates Raws li Cov Kev Pabcuam

Kauj Ruam 1: Txiav txim seb puas muaj qhov kub thiab txias hloov pauv

• ΔT < 80℃uas tsis muaj kev pib sai - nres → Khoom siv (tus nqi qis tshaj, zoo tshaj plaws rigidity).
• ΔT nruab nrab ntawm 80℃~ 300 degree, lossis lub sijhawm ua haujlwm purging → Flexible wedge. Paub meej tias qhov sib txawv ntawm kev nthuav dav coefficients ntawm lub valve lub cev thiab cov khoom siv wedge yog tsawg dua lossis sib npaug li 10%.
• ΔT> 300℃lossis radial pipeline hloov chaw → Split wedge, siv lub peev xwm hloov tau ntawm ob lub rooj vag.

Kauj Ruam 2: Txheeb xyuas qhov huv huv nruab nrab thiab Corrosiveness

• Cov xov xwm huv si (dej, nkev, roj av, hydrogen) → Tag nrho peb hom yog siv tau, nrog cov khoom siv wedges muab qhov kev sib khi siab tshaj plaws.
• Media uas muaj cov khoom nyuaj (particle loj> 0.5 hli) → Split wedge tso cai rau cov khoom kom dhau los ntawm lub rooj vag clearance, tsis txhob khawb ntawm qhov chaw sealing. Cov khoom khov thiab hloov tau yooj yim yuav tsis kaw tag nrho vim muaj cov khoom sib txuam.
• High corrosive los yog qaub xov xwm (NACE MR0175) → Flexible wedge grooves yog nquag muaj kev ntxhov siab corrosion cracking; Kev sib cais los yog cov kab nrib pleb yog qhov zoo dua, nrog cov khoom sib khi hardfaced nrog Inconel 625.

Kauj Ruam 3: Txheeb xyuas cov chav kawm siab thiab cov kav dej rigidity

• Siab - cov xwm txheej siab ntawm Chav Kawm 600 thiab siab dua: Cov kab txuas yooj yim tau txo lub rooj vag lub zog vim yog grooving; Lub rooj vag buckling lub zog yuav tsum raug txheeb xyuas (qhov kev txheeb xyuas qhov kawg qhia tau hais tias qhov kev ntxhov siab ntawm qhov zawj hauv qab ntawm cov npoo hloov tau yog 35% siab dua li ntawm cov khoom sib txuas ntawm Chav Kawm 900).
• Loj -ntev (DN Ntau dua lossis sib npaug li 500) nrog kev ua haujlwm nquag: Cov kab sib cais muaj qhov txav ntau dua thiab ncua sij hawm ua haujlwm luv dua (kev tshuaj xyuas pob khawm xav tau tom qab kwv yees li 5000 lub voj voog). Cov wedges yooj yim tsis muaj qhov txav txav thiab tsim nyog rau kev ua haujlwm siab - zaus.

 

IV. Summary and Professional Recommendations

Hom kab	Kub Adaptability	Particle Resistance	Thermal Cycle Life	Tej yam kev thov Scenarios
Khoom Wedge	Tsawg	Tsawg	Nruab nrab	Ib txwm- cov kav dej kub, qis- cua siab
Flexible Wedge	Siab	Nruab nrab	Siab	Chav kav dej, siab -kub kub hloov roj, hydrogenation units
Split Wedge	Siab heev	Siab	Nruab nrab	Sandy crude roj, coking ntauwd hauv qab, thermal voj voog tawg roj

 

Core Xaiv Logic: Ua ntej txiav txim seb qhov yuav tsum tau uarooj vag valve wedge hom rau kub kublos yogabrasive media wedge xaiv, ces xa mus rau cov lus parameter saum toj no. Rau cov xwm txheej uas muaj qhov kub thiab txias, qhov sib cais wedge yog tib txoj kev xaiv; rau qhov kub thiab txias yam tsis muaj cov khoom, qhov hloov pauv tau muab cov nqi zoo tshaj plaws.

 

Rau qhov kawg tsim, nws raug nquahu kom xa mus rau daim ntawv qhia txog kev xaiv lub voj voog nyob rau hauv Cov Ntawv Ntxiv 12th Edition ntawm API 600, ua ke nrog qhov tseeb valve qhib / kaw torque testing (tus qauv xav kom wedging torque tsis tshaj 70% ntawm qhov tso cai qia torque).