Double Disc Flat Gate Valves
...Double Disc Flat Gate ales 双闸板平板闸阀 Double Disc Flat Gate Valves 双闸板平板闸阀 ; 双闸板平板 ; 高温高压电站闸阀 ; 双阀板平板 inside screw nonrising stem double disc gate valve 暗杆双闸板...
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短语
双闸板平板闸阀
Double Disc Flat Gate Valves
补偿式双闸板平板闸阀
fcompensation double parallel gate valve