铲斗控制阀滑阀
bucket control valve spool
吊钩马达控制阀滑阀
hook motor control valve spool
辅助制动阀滑阀
secondary brake valve spool
活塞式滑阀
piston-type sliding valve
piston valve
piston slide valve
减速器控制阀滑阀
retarder control valve spool
减压阀滑阀
pressure reducing valve spool
快速响应阀滑阀
quick-response valve spool
速度传感阀滑阀
speed sensing valve spool