controllable check valve meaning in Chinese

可控单向阀

Valves and taps for water supply in buildings . controllable check valves class a . general technical specifications
建筑物水管阀门. a级可控止回阀.通用技术规范
Valves and taps for water supply in buildings . non controllable check valves class b . general technical specifications
建筑物水管阀门. b级非控制非止回动阀.一般技术规范
Valves and taps for water supply in buldings . controllable check valves ea , with flanges . general technical specifications
建筑物水管阀门.带法兰可调ea止回阀.通用技术规范