常闭二位三通气控阀的翻译：Normally closed two three pneumatic control valve 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Normally closed two three ventilation control valve

Normally closed two three pneumatic control valve

Often shuts two three ventilations to control the valve

Often closed 2 aeration control valve located 3

Normally closed two three pneumatic control valve