明杆平行式双闸板闸板 Double Disk Parallel Gate Valves ; Double Disk Parallel ; DoubleDiskParallelGateValves

明杆平行式双闸滑阀 rising-stem double-disk parallel slide valve ; disk parallel slide valve

双闸板式防喷器 preventer of double ram type

补偿式双闸板平板闸阀 fcompensation double parallel gate valve

明杆平行式双闸板闸阀 double disk parallel gate valves

电动平行式双闸板闸板 ElectricDoubleDiskParallelGateValves ; Aspirating valves ; Electric Double Disk Parallel Gate Valves ; Electric c Double Disk Parallel Gate Valves

电动平行式双闸板闸阀 Electric Double Disk Parallel Gate Valves