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???? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ?????? ??????? ???? ?????? ?????? ??????? ????? ?? ????????? ????????. ???????? ??????? ???????? ?????? ?? ???? ????? ??????? ??????? ??? ?????? ?????? ????????? ?? ????? ???????? ??? ????? ?????? ??????? ?????? ?????? ??????? ???????? ?????? ??????? ?????? ?????? ?????? ??????? ????? ??? ???? ?????? ??????? ??????? ?? ???? ??????? ?? ???????. ??? ???? ????? ?????? PTFE ????? ?????? ?????? ?? ?????? ???????? ?????. ?? ??? ??? ??? ??? 600 WOG (????? ?????? ??????)? ?? ????? ???????? ??????? ???????? ????? ????? ????? ??????? ??? ???? ????? ??????? ????? ?????? ????? ?????? ?????? ?????? ??????? ?????? ????? ???????? ????? ???? ??????? ?????? ??????? ??????? ???????. ?? ??????? ??? ?????? ???? ???????? ????? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ?????? ????? ?????? ????? ?????? ???? ???? ?????? ???????