The model of thermal expand valve is built and the connection of flux, pressuredifference between the front and behind of the valve and cryogen dryness of inlet and outlet.
建立了热力膨胀阀模型，重点建立了流量与阀前后压差及制冷剂进出口干度的关系。
2
Introduces the working principle and the method of the selection about the type ZY47 Valve controlled by the pressuredifference, and analyses its adaption condition.
介绍了ZY 47型自力式压差控制阀的工作原理和选型方法，分析了不同被控环路系统的适用条件。
3
When the pressuredifference changes with time, a phase shift will occur between the transient pressuredifference and displace of valve flap, which could cause leakage and even reverse flow.