喷嘴挡板式气动伺服阀
nozzle-flapper type pneumatic servo valve
两级电液压伺服阀
two-stage electrohydraulic servo valve
非对称气动伺服阀
asymmetric pneamatic servovalve
电-气压力伺服阀
electro-pneumatic pressure servo-valve
电动液压伺服阀
Electro-hydraulic Servo Valve
电动液力伺服阀
Electro-hydraulic Servo Valve
点火提前伺服阀
timing advance servo spool
比例伺服阀
servo and proportional valve
proportional servo valve
Proportional-servo valve