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迷宫式高差压调节阀为降低阀内的流体流速，采用“反向双弯头”组成“曲折流道，多级降压，迷宫密封”的阀芯结构。其流道复杂，工作介质为高温、高压下的未充展的汽水两相流，阻力计算较为困难。该文作者发展了“等（变）差压渐进设计法”，即将复杂流道分解为一系列的阻力环节，选择现有充展两相流理想均匀流阻力计算模型并适当修正，计算每个阻力环节的阻力，从而得出总压降； 随阀杆一步一步前进，根据要求的流量开度特性计算出复杂流道结构尺寸。对复杂流道中未充展的两相流阻力计算进行了有益的尝试。实验结果表明，理论计算值和实际测量值基本相符。
Labyrinth high differential pressure regulating valve In order to reduce the flow rate of the fluid in the valve, the valve structure of “reverse double elbow” composed of “tortuous runner, multistage depressurization and labyrinth seal” is adopted. The flow path is complex, the working medium is unfrozen soda water two-phase flow under high temperature and high pressure, and the calculation of the resistance is difficult. The author of the paper developed a “progressive equal-pressure differential design method”, that is, the complex flow path is decomposed into a series of resistance links. The current uniform flow resistance calculation model of two-phase flow filling is selected and properly corrected, The resistance of the resistance link, so as to obtain the total pressure drop; with the valve stem step by step, according to the required characteristics of the flow opening to calculate the complex flow channel structure size. It is a useful attempt to calculate the resistance of two-phase flow in the complicated channel. The experimental results show that the theoretical calculated value is in good agreement with the actual measured value.