操纵的先导安全阀
pilot operated relief valve
操纵的先导单向阀
pilot operated check valve
差动转向先导阀
differential steering pilot valve
车架水平调节先导阀
frame levelling pilot valve
车架水平调节先导系统
frame levelling pilot system
单先导升降单向阀
single pilot elevation check valve
低速先导控制阀
slow speed pilot control valve
电磁操纵先导控制阀
solenoid operated pilot control valve