A disk turning on a diametrical axis inside a pipe, used as a throttle valve or damper.
节流阀，减压阀：管道内沿直径中心轴线上的圆片状旋钮，用作节流阀门或阀门。
2
Not new, but the subject of much controversy in Germany, the damper takes the form of a free-moving mass inside a vertical spring.
虽然不算是新闻，但在德国站比赛中引起较多争议的是减震器的使用，其结构是在垂直的弹簧中间加入减震块。
3
After several years' operation, hydraulic medium and sealing elements inside the damper also have different degrees of aging, and abrasion is also caused among relative sliding parts;