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。
Must not be smaller than the pipe size of the relief valve or have any reducing coupling installed in the discharge line.
从弹簧刚度、整定压力范围，讨论了针对安全阀同一口径，在整定压力和回座压力比较接近的情况下，弹簧的优化设计。
From spring rigidity and range of set pressure, spring optimize design to same diameter's safety valve at set pressure near blow-down pressure are discussed.
排泄管道必须与安全阀出口具有相同的口径，必须从安全阀的下方接到安全排放地点。
The discharge line must be the same size as the valve outlet, and must pitch downward from the valve to a safe place for disposal.
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