???? ????? ???? ??? ?????? Gg25 ?????? ??? ???? ???? ?????? ??????

?? ???? ??? ?????? Gg25 ?? ???? ???? ?????? ???? ?? ???? Shijiazhuang Deye Piping Industrys Co., Ltd. ??? ?? ????? ???? ??? ?????? ??? ?????? ???? ????? ????? ?? ????? ???????? ????????. ??? ????? ?? ???? GG25? ???????? ????????? ???????? ?????? ???? ?????? ??????? ???? ????? ??? ????? ????????? ?? ????????? ???? ???? ???? ??? ?????? ?????? ????? ???? ???????? ??? ?? ????? ?? ????? ?????? ??????? ?????? ???????? ??????????? ?????? ???????? ???????? . ??? ????? ?? ?????? ?? ??????? ???????? ?????? ?????? ???????? ????? ????????? ??? ?? ????? ???? ?????? Gg25 ?????? ?????? ??????? ????? ????????? ????? ????? ????? ???????. ???? ??????? ???????? ??? ??? ?????? ?????? ???? ???? ?? ???? ??????? ?? ???? ???????? ?????? ???? ??? ???? ???? ????? ?????? ?? ????? ???????? ??? ?????? ???? Shijiazhuang Deye Piping Industrys Co., Ltd. ??????? ???? ???????? ??? Gg25 ??? Check Valve ?????? ??????? ??? ???? ?????? ????? ?? ???? ??? ??????? ???????