n. head gate
misc. master valve
方井的深度是这样设计的，圣诞树的总闸门从地表水平容易到达。
The depth of the cellar is such that the master valves of the Christmas tree are easy to reach from ground level.
一种水下采油树，它在水平轴线上装有总闸门和流动控制设备，以便最大限度地降低装置的高度。
Christmas tree design for subsea applications, configured with the master valves and flow-control equipment on a horizontal axis to minimize the assembly height.
上部总闸门用于日常运行，而下部总闸门用于在正常使用的闸门发生渗漏并需要更换的情况下提供备用或应急的功能。
The upper master valve is used on a routine basis, with the lower master valve providing backup or contingency function in the event that the normal service valve is leaking and needs replacement.
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