ballhead system 球头系统

ballhead flyweight 球头飞锤

ballhead pilot valve 球头导阀

ballhead backup actuator 球头备用致动器

ballhead bushing 球头轴套

ballhead pilot valve bushing 球头导阀轴套

ballhead onion 圆头葱

integral mechanical ballhead governor 整体机械式球头调速器

rotating ballhead 旋转球头