Using this feature with the Purge Valve closed can result in over pressurizing the system or exceeding the Pressure Safety Relief Valve setting.

在放气阀关闭时使用这个功能，可能会导致系统压力过大或超过压力安全阀的设置压力。

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The main reasons were due to the defect in the design of safety valve secondary circuit and the overlap of the service rating and the setting for safety valve popping and reseating.

主要原因是锅炉安全阀二次保护回路设计有缺陷，再加上安全阀起跳和回座的整定值与运行额定值相重叠造成的。

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This paper introduces the structure, setting principle, orifice diameter calculation, selection and installation requirement for safety valve.

介绍了安全阀的结构、设计原则、喉径计算、选用和安装要求。

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