清除阀 meaning in English

furge valve
purge valve
scavenging valve

A canister purge valve is opened periodically to vent the vapor back into induction system .
收集器的清除阀周期性地开启，泄放蒸气使之返回进气系统。
When the new valve is started , before the installation , should remove quakeproof matters between the discs , otherwise the respiration will malfunction
新阀启用时，安装前应清除阀盘间防震物，否则呼吸阀将失灵。