crankcase ventilation valve 曲轴箱通风阀

positive crankcase ventilation valve 曲轴箱强制通风阀

Quick Ventilation Valve 放气阀

tank ventilation valve 油箱通风阀

Emergency ram air ventilation valve 应急冲压空气通风活门

PCV Positive Crankcase Ventilation Valve 曲轴箱通风阀

bulkhead ventilation gate valve 舱壁通风闸阀 ; 隔舱通风闸阀

outboard ventilation exhaust valve 船外排风阀

Ventilation outflow valve 通风排放活门