卸载引导阀 unloader valve: 气压调节阀; 卸荷阀valve unloader: 阀动装置操作阀pilot valve: 操纵阀; 导阀控制阀; 导向阀; 副配压阀; 先导阀; 向导阀; 指挥器expansion valve with pilot valve: 导向式自动膨胀阀a lication pilot valve: 作用导阀下载手机词典可随时随地查词查翻译