Chii chinonzi API 609 Butterfly Valve API 609 Butterfly Valve mavharuvhu emuindasitiri akagadzirwa zvinoenderana nezvinodiwa neAmerican Petroleum Institute (API). Anodzivirira ngura zvakanyanya, anodzivirira ngura, uye akavimbika pakumanikidzwa mumapaipi emafuta, gasi, makemikari, uye petrochemical. Aya mavharuvhu anoshanda zvakanyanya...
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