DQZK-40NM蝶阀 煤气法兰式电动蝶阀 D943H-16C 球阀 执行机构

D341X,D341H,D37SD341X,SD343H伸缩蝶阀

D341X,D341H,D37手动对夹式软密封蝶阀D71X/D371X-10/16 手柄/蜗轮蝶阀

D341X,D341H,D37SD41X,SD43H手动伸缩蝶阀DN50

D341X,D341H,D37SD641X,SD643H气动伸缩蝶阀

D341X,D341H,D37SD941X,SD943H电动伸缩蝶阀

D341X,D341H,D37SD341X,SD343H法兰伸缩蝶阀SD341X,SD343H法兰伸缩蝶阀

D341X,D341H,D37SD341X,SD343H双法兰伸缩蝶阀

D341X,D341H,D37SD341X,SD343H管网伸缩蝶阀

D341X,D341H,D37SD941X,SD943H电动法兰式伸缩

D341X,D341H,D37SD341X,SD343H蜗轮传动伸缩蝶阀

D341X,D341H,D37D973H电动三偏心蝶阀