1) Raws li qhov yuav tsum tau ua, qee qhov yuav tsum tau polished, thiab qhov chaw yuav tsum tsis txhob muaj cov burrs, thiab lwm yam;
2) Txhua qhov chaw yog degreased;
3) Stainless hlau pob valve yog pickled thiab passivated tom qab degreasing (tus neeg saib xyuas tsis muaj phosphorus);
4) Yaug nrog dej ntshiab tom qab pickling thiab passivation, thiab yuav tsum tsis txhob muaj cov tshuaj residue (cov kauj ruam no yog muab tshem tawm rau carbon steel qhov chaw);
5) Qhuav qhov chaw ib los ntawm ib tug nrog ib tug uas tsis yog-woven daim ntaub, thiab tsis txhob tawm ntawm qhov chaw xws li hlau ntaub plaub los yog qhuav nrog huv si nitrogen;
6) Siv cov ntaub ntawv uas tsis yog-woven los yog cov ntawv lim cov ntawv dipped rau hauv cov tshuaj analytical ntshiab cawv los so txhua qhov kom txog thaum tsis muaj xim qias neeg.
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