The usage problems of foreign safety valve was introduced, Causes was analyzed, and the redesign was made. Ultimately the conseguence of test and application effect were narrated.

• 摘要介绍了国外进口安全阀在使用中存在的问题，详细分析了发生问题的原因，并进行了改进设计，叙述了改进设计以后的试验情况和应用效果。