secondary safety valve的意思|示意

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。

The automatic gas-off device of the gas cooker can alarm when the indoor gas reaches an alert concentration, and automatically close the gas secondary valve to get rid of potential safety hazard.

本发明可以在室内煤气达到警戒浓度后报警，并自动将煤气二级阀门关闭，解除安全隐患。