in-line needle valve 管道针状阀
in-line sampling valve 在管路中的抽样检验阀
in-line relief valve 管道安全阀 ; 管道泄压阀
INV in-line needle valve 管道针形阀
in line check valve 进油单向阀
Any leak or failure results in loss of control line pressure, acting to close the safety valve and render the well safe.
任何的渗漏或损坏都将造成控制管线压力的损失，这时关闭安全阀并确保井的安全。
When the valve is open, it is like a straight piece of pipe in the line.
当阀门处于开启状态时，整个阀门就像管线上的一段管道一样。
Must not be smaller than the pipe size of the relief valve or have any reducing coupling installed in the discharge line.
不能小于安全阀的管道口径，也不能在排泄管上安装任何缩径管接头。
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