multi-disc swing check valve
旋启式止回阀：swing check valve 旋启多瓣式止回阀：multi-disc swing check valve 蝶式微阻缓闭止回阀：butterfly check valve with little hinder and slow closing ..
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... 单瓣旋启式止回阀 Single disc swing check valve 多瓣旋启式止回阀 Multi-disc swing check valve 升降式止回阀 Lift check valve ...
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