Cov Txheej Txheem ntawm Kev Sib Txuas Ruaj Ntseg: Nkag Siab Txog EN545 Cov Pob Qij Txha Uas Tshem Tau

Cov pob qij txha uas tshem tauUa lub luag haujlwm tseem ceeb hauv kev teeb tsa thiab kev saib xyuas cov kav dej hlau ductile. Lawv muab kev daws teeb meem kev sib txuas uas yooj ywm thiab txhim khu kev qha, tshwj xeeb tshaj yog thaum txuas cov kav dej hlau ductile (DIP) rau lwm yam khoom siv, xws li cov kav dej hlau, cov kav dej PVC, cov li qub, lossis cov dej tua hluav taws. Cov pob qij txha uas tshem tau ua raws li European tus qauv EN545 (Cov kav dej hlau ductile, cov khoom siv, cov khoom siv, thiab cov pob qij txha rau kev muab dej haus) kom ntseeg tau tias cov khoom zoo thiab kev sib xws. Tsab xov xwm no yuav muab kev nkag siab tob txog ob lub ntsiab lus tseem ceeb: kev ntsuas kev ua tau zoo ntawm cov khoom sib koom ua ke thiab ob hom kev sib txuas tseem ceeb.

1. Nkag Siab Txog Lub Npe Khoom Siv:QT500-7

Thaum koj yuav ib lub ductile iron dismantling fitting uas ua raws li tus qauv EN545, koj yuav pom "QT500-7" lossis lwm lub npe zoo sib xws uas muaj nyob rau ntawd. Qhov no tsis yog tsuas yog lub npe xwb; nws qhia ncaj qha txog cov khoom siv ntawm lub fitting thiab yog ib qho cim qhia txog nws qhov zoo.

• QT: Cov lus luv no sawv cev rau "Quenched and Tempered." Cov txheej txheem kho cua sov no hloov cov graphite hauv cov hlau cam khwb cia los ntawm flakes mus rau spheroids (spheroidization), txhim kho cov khoom siv lub zog, toughness, thiab ductility. Yog li ntawd, QT kuj sawv cev rau "Ductile Iron" (lossis "Nodular Iron").
• 500: Tus lej no sawv cev rau lub zog tensile tsawg kawg nkaus ntawm cov khoom siv ntawm 500 megapascals (MPa).Lub zog tensile yog hais txog qhov siab tshaj plaws uas cov khoom siv tuaj yeem tiv taus thaum muaj kev nruj ua ntej tawg. 500 MPa yog tus nqi siab, txhais tau tias cov khoom siv muaj zog heev, muaj peev xwm tiv taus cov kev ntxhov siab siab hauv cov kav dej nrog rau cov av sab nraud thiab kev ntxhov siab ntawm cov khoom siv, ua kom ntseeg tau tias cov qauv thiab kev nyab xeeb ntawm qhov sib koom ua ke.
• 7: Tus lej no sawv cev rau cov khoom siv elongation thaum tawg (Elongation thaum tawg) ntawm 7%.Kev ntev yog qhov ntsuas ntawm cov khoom siv lub zog thiab kev hloov pauv, uas sawv cev rau feem pua ​​​​​​ntawm qhov nce ntawm qhov ntev ntawm cov qauv thaum tawg piv rau nws qhov ntev qub. Kev ntev ntawm 7% qhia tau tias cov khoom siv muaj kev tawv zoo heev. Txawm tias muaj kev hloov pauv me ntsis (xws li kev ntxhov siab los ntawm kev sib tsoo hauv paus lossis kev hloov pauv kub), nws qhia txog qee qib ntawm kev tsim khoom thiab kev hloov pauv, uas yog qhov tseem ceeb rau kev ua kom lub foob sib koom ua ke nyob rau hauv cov xwm txheej ua haujlwm nyuaj.

Hais yooj yim xwb, QT500-7 txhais tau tias qhov sib koom ua los ntawm cov hlau ductile uas muaj zog thiab tawv heev. Nws yog ob qho tib si "nyuaj" thiab "tawv," es tsis yog "nkig," ua rau nws yog qhov kev xaiv zoo tshaj plaws rau cov khoom siv txuas yeeb nkab.

2. Ob hom kev sib txuas tseem ceeb: Tyton Joint thiab Flanged Joint

EN545 cov pob qij txha uas tshem tau feem ntau yog siv los txuas cov kav hlau ductile rau cov khoom siv / cov khoom siv ntawm ntau txoj kab uas hla lossis cov ntaub ntawv sib txawv. Cov hom feem ntau thiab sawv cev yog Cantonese (T-hom) thiab stepped (F-hom).

1. T-Joint/ Tyton Joint

• Cov yam ntxwv ntawm cov qauv:Lub qhov (socket) ntawm qhov sib koom ua ke muaj ib qho groove tapered sab hauv.Ib lub gasket roj hmab stepped-lip yog siv ua lub sealing element.
• Txoj Cai Ua Haujlwm:Thaum lub sijhawm teeb tsa, lub gasket raug muab tso rau hauv qhov zawj ntawm lub qhov (socket), tsim kom muaj ib qho "cheeb tsam xauv" ntuj.Tom qab ntawd, qhov kawg ntawm lub qhov (txawm tias yog hlau ductile, hlau, lossis lwm yam yeeb nkab du) raug ntxig rau hauv lub qhov (socket).Nyob rau hauv kev cuam tshuam ntawm cov kua dej sab hauv lossis lub zog sab nraud, lub gasket raug nias thiab nias rau ntawm phab ntsa sab nraud ntawm lub spigot thiab lub qhov (socket groove), tsim ib qho kev sib khi zoo. Kev siab siab dua feem ntau ua rau lub foob zoo dua.
• Cov txiaj ntsig:Kev teeb tsa yooj yim thiab ceev, tsis tas yuav muaj cov cuab yeej tshwj xeeb thiab tuaj yeem ua tiav manually.
• Muaj qee qib kev hloov pauv tau tso cai rau kev hloov pauv me me hauv lub hauv paus.
• Nws yog ib qho ntawm cov txheej txheem txuas uas tus qauv tshaj plaws thiab siv tau ntau yam hauv cov kav dej hlau ductile.

2.F-Hom Sib Koom Tes

• Cov yam ntxwv ntawm cov qauv:Ib kawg ntawm qhov sib koom ua ke muaj tus qauv EN1092-2 B1 series flange (feem ntau yog PN10 lossis PN16 qhov ntsuas siab), thaum lwm qhov kawg tuaj yeem ua ntau hom (xws li Cantonese, vuam, thiab lwm yam).
• Ntawm no, peb tab tom tham txog cov pob qij txha uas tshem tau nrog lub flange ntawm ib kawg.
• Txoj Cai Ua Haujlwm:Cov ntsia hlau thiab cov txiv ntoo ruaj ntseg qhov kawg ntawm qhov sib koom ua ke rau ntawm qhov flange mating ntawm lwm lub cuab yeej (xws li lub valve, twj tso kua mis, lossis lub tshuab tua hluav taws) lossis yeeb nkab (xws li yeeb nkab hlau).
• Ib lub flange gasket tau teeb tsa ntawm ob lub ntsej muag flange los muab lub foob.
• Cov txiaj ntsig:Qhov sib koom ua ke no ruaj khov heev thiab tuaj yeem tiv taus lub zog tensile siab heev thiab lub sijhawm khoov.Nws yooj yim rau disassemble los ntawm kev loosening cov bolts, ua rau yooj yim rau kev saib xyuas thiab hloov cov khoom siv tom qab.Nws muaj ntau yam siv tau thiab ua tus qauv thoob ntiaj teb rau kev txuas cov khoom siv ntawm ntau yam kev ntsuas siab thiab cov ntaub ntawv (xws li txuas cov yeeb nkab hlau ductile rau cov hlau li qub).