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?? ???? ????? Bolted Bonnet ?????? ?? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?? ???? ????? ???? ?????? ???? ????? ????? ?? ?? ????? ?????????. ?????? ??? ????? ?? ?????? ??????? ???? ???? ?? ?????? ????? ?????? ??????????? ??????? ?????? ?? ???????? ????????. ????? ?????? ?????? ???? ???? ???? ???????? ??? ???? ????? ????? ????? ??????? ??? ????? ??????? ????? ?????? ?????? ??????? ???????. ???????. ???? ?????? ????? ??????? ??????? ????????? ?? ??????? ????????? ??? ????? ?????? ????? ?????? ?? ???????? ???? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ?? ??????? ????? ????? ????? ????? ???? ?????? ?????? ???????? ??? ???? ??????? ?????? ??????? ??????? ???????? . ???? ????? ???????? ????? ????????? ?????? ????? ??????? ????? ????? ??????? ?????? ????? ?? ???????? ???? ???????. ???? ????? ?????? ????????? ??? ???? ??????? Bolted Bonnet ?? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ???? ??????? ???????? ?????? ?? ?????? ??????? ?????? ??