卸载阀 meaning in English

feather valve
unload valve
unloading valve

Mine emulsin pump station - technical condition of unloading valve
煤矿用乳化液泵站.卸载阀技术条件
Analysis on the structure and principle of auto - unloading valve of trimax pump
型泵自动卸载阀的结构及原理分析
Steam packing unloading valve
汽封卸载阀
Automatic unloading valve
自动卸载阀
Hydraulic fluid power - pressure - reducing valves , sequence valves , unloading valves , throttle valves and check valves - mounting surfaces
液压流体动力.减压阀顺序阀卸载阀节流阀和止回阀.安装面