在安全阀临界压力比分析研究的基础上 ,提出了一种确定安全阀临界压力比的计算公式 安全阀临界压力比主要受喷管临界压力比和阀瓣流阻系数的影响 ,由喷管临界压力比可确定安全阀临界压力比 由于阀瓣流阻系数过大 ,安全阀一般处于亚临界流动状态 Based on the analysis of the critical pressure ratio of the safety valve, a formula to determine the critical pressure ratio of the safety valve is proposed. The critical pressure ratio of the safety valve is mainly affected by the critical pressure ratio of the nozzle and the valve drag coefficient, Pressure ratio to determine the critical pressure ratio of the safety valve As the valve resistance coefficient is too large, the safety valve is generally in the subcritical flow state