双闸板 Double disc
双闸板平板闸阀 Double Disc Flat Gate Valves
明杆平行式双闸板闸板 Double Disk Parallel Gate Valves
双口排气球 Double Opening Exhaust Valves
排水阀 Drainage valves
双闸板平板闸阀 Double Disc Flat Gate Valves
明杆平行式双闸板闸板 Double Disk Parallel Gate Valves
双口排气球 Double Opening Exhaust Valves
排水阀 Drainage valves
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