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两相流动的特性涉及每一相的流量、物理性质及相际之间的相互作用等诸多因素，加之两相可能存在的各种流型，故比单相流动要复杂得多。使用理想喷嘴（流动过程中无摩擦损失，即等熵流动）的概念，以均相平衡模型（HEM）为基础，利用经验公式将繁琐的多次等熵闪蒸计算进行简化，阐述了用于两相流安全阀计算的简捷方法，与严格的等熵闪蒸计算比较，相对误差一般小于5％，并举例进行了说明。
The characteristics of two-phase flow relate to the flow rate, physical properties and the interaction between each phase and many other factors, as well as the various flow patterns that may exist in two phases, so it is much more complicated than single-phase flow. Based on the Homogeneity Equilibrium Model (HEM), using the concept of an ideal nozzle (frictionless loss in flow, ie, isentropic flow), the tedious multiple isentropic flash calculations are simplified using empirical equations, The simple and quick method of two-phase flow safety valve calculation, compared with strict isentropic flash calculation, the relative error is generally less than 5%, and an example is given.