弹簧加载安全阀
spring loaded relief valve
弹簧加载单向阀
spring loaded check valve
弹簧加载定向控制阀
spring loaded directional control valve
弹簧加载风扇皮带张紧轮
spring loaded fan belt tightener pulley
弹簧加载火花塞伸长部
spring loaded spark plug extension
弹簧加载控制阀
spring loaded control valve
弹簧-加载针阀
spring-loaded needle valve
弹簧加载止回阀
spring-loaded check valve