BS 5163 Gate Valve and BS 5153 Swing Check Valve Gate Valve

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BS 5163 Gate Valve and BS 5153 Swing Check Valve Gate Valve and BS 5153 Swing Check Valve有关阀门
这话中的BS 5163 跟BS 5153 是什么东西啊?

Swing check valve 旋启式止回阀 gate valve 闸式阀,闸门阀

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