1. 止回阀：circulation valve 环流阀 | clack valve 止回阀 | clapper valve 瓣阀
2. 瓣阀：civilian injury 老百姓受伤 | clack valve 瓣阀 | cladding 色层法
3. 翼门阀：护面钢 clad steel | 翼门阀 clack valve | 循环水 circulating water
4. 瓣阀,逆止阀：cistern 槽 | clack valve 瓣阀,逆止阀 | clack digester 复合钢板蒸煮锅
noun
1. a simple valve with a hinge on one side
allows fluid to flow in only one direction
Synonym: clack clapper valve