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AWWA c504 ???? ????? ???? ??????? ?? ????? ??????

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??? ???? ?? ??????? ??????? ????? ANSI 316

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???? ????? ????? ??? ??????? HDPE (GV-A-4)

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????? Y ?? ?????? ????? DIN PN16

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?????? ?????? Valve World Expo

??? ????? ???? Valve World Expo Asia ???? ??? ?? ???????? ???? 26 ?27 ??????? ??? ??????? ???? ??? ???? ?? ??????? ?? ??????? ??? ???? ??????? ??????? ?????? ??? ?????. ?????? ????? ...