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目前多数关于控制阀计算的文献中，对气体、液体和蒸汽在调节阀中流量系数Ｋｖ的计算都进行了一定的探讨。只是对两相流的计算处理为气体和液体的Ｋｖ值相加。这种简单的处理没有考虑到两相间存在能量和质量传递。由于国际上对两相流尚无统一计算标准，这里参考国内外的资料，采用有效密度法和管件形状修正对两相流的Ｋｖ值计算作一次探索。这里采用膨胀系数修正求得修正后的气体密度，然后再与液体部份的密度一起求出两相流体的有效密度。但所采用的公式较为复杂，求有效密度的简便方法有待进一步探讨。
Most of the current literature on control valve calculation, the gas, liquid and steam in the control valve flow coefficient Kv calculations are discussed. Only the two-phase flow is calculated as the sum of the Kv values for gas and liquid. This simple treatment does not take into account the energy and mass transfer between the two phases. Because there is no uniform standard for the two-phase flow in the world, reference is made to the data both at home and abroad here, and the Kv value calculation of the two-phase flow is explored using the effective density method and the shape correction of the pipe. Here, the corrected gas density is obtained by using the expansion coefficient correction, and then the effective density of the two-phase fluid is obtained together with the density of the liquid portion. However, the formula adopted is rather complicated and the simple method of obtaining effective density needs to be further explored.