... 平移因子：shift factor 平行双闸板：double disc parallel seat 平行流程;平行流：parallel flow ...
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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
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