expansion valve with pilot valve导向式自动膨胀阀

Check valve hydraulically pilot operated单向阀

suspension valve pilot cylinder悬挂阀先导油缸

Valve GP-pilot先导阀总成

locomotive valve pilot机车断汽指示记录仪

suspension valve pilot mechanism悬挂阀控制机构

check valve pilot operated液控单向阀

valve pilot valve阀导阀

Valve GP-pilot relief先导安全阀总成

load control valve pilot line负荷控制阀先导管路