德标铸铁法兰蝶阀VALVE BUTTERFLY CAST IRON DIN FLANGED TYPE SERIES 55 面议 青铜升降式日标法兰止回阀F-7417 lift check union Bonnet Type Globe 面议 青铜螺丝式闸阀 125LBS GATE VALVE BRONZE SCREWED 面议 青铜日标法兰截止止回角阀F7352 ANGLE SCREW DOWN CHECK BRONZE 面议 铸铁日标法兰截止止回阀 F7375 GLOBE VALVE SCREW DOWN CHECK C-IRON 面议 覆盖式铜日标法兰角形截止阀 F7349 ANGLE VALVE BRONZE FLANGED UNION 面议