在发生事故或系统不稳定的状况下，当管内燃气压力降低时，燃烧点的火会通过管道向气源方向蔓延，称作回火。防止并阻断这种回火的装置称作回火防止器。
基于氢氧焰的燃烧特性，设计了一种用于氢氧焊割设备的新型氢氧焰回火防止器。
Based on the combustion characteristics of oxyhydrogen flame, a new flash-back arrestor faced on oxyhydrogen flame applied for oxyhydrogen welding and cutting equipment is designed.
应用可靠案件技术分析了回火防止丧失阻火作用的原因，提出了确保回火防止器安全可靠性的具体措施。
The reliability technique is used to analyse why the back fire preventer failed to stop the fire. Specific measures have been proposed to guarantee the safety reliability of the back fire preventer.
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