螺旋弹簧加载双坡口油环
coil spring loaded slotted oil control ring
弹簧加载控制阀
spring loaded control valve
弹簧加载火花塞伸长部
spring loaded spark plug extension
弹簧加载风扇皮带张紧轮
spring loaded fan belt tightener pulley
弹簧加载定向控制阀
spring loaded directional control valve
弹簧加载单向阀
spring loaded check valve
弹簧加载安全阀
spring loaded relief valve