multi-disc swing check valve的意思|示意

旋启多瓣式止回阀 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 ..

多瓣旋启式止回阀 ... 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 ...