operating valve foot pedal [铁路] 踏脚板
Double disc swing foot valve 旋启双瓣式底阀
Multi-disc swing foot valve 旋启多瓣式止回阀 ; 旋启多瓣式
cast iron foot valve 铸铁足阀
iron foot valve 铁底阀
foot valve seat 底阀座
foot valve cage 底阀罩
For foot valve, replace inlet end connection with an F. V. screen housing assembly.
对于底阀，用一个F.V。滤网外壳组件更换进口连接管接头。
Correct or replace foot valve.
校正或更换底阀。
By adopting some technology of advanced detection, adding temporary invert, sleeve valve pipe and lock foot bolts, the construction of the tunnel is completed safely and successfully.
暗挖区间隧道通过采用超前探测、增设临时仰拱、袖阀管、锁脚锚管等技术措施，安全、顺利完成了北四环路和北辰桥段的施工。
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