chain return cylinder 带链传动的液压缸

spring return cylinder 弹簧回程的缸

master cylinder piston return spring 主缸活塞回位弹簧

cylinder return passage 油缸回油道

cylinder return oil 油缸回油

hydraulic cylinder return spring 液压缸回动弹簧

Main cylinder return 主缸回程力

self-return plunger cylinder 自回复柱塞缸

Return circuit on cylinder 上缸回程回路