And centrifugal pumps compared with single-screw pump do not need to install the valve, while the linear flow of traffic is stable.
和离心泵相比，单螺杆泵不需要装阀门，而流量是稳定的线性流动。
The system model comprises the dynamic heat exchanger model based on the lumped parameter method and moving phase boundary method, and the stable flow models of compressor and expansion valve.
系统模型中包含了用集总参数和相移动边界法建立的热交换器动态模型，以及压缩机和膨胀阀的稳态流动模型。
Compared with the centrifugal pump without a single screw valve, the flow is stable linear flow.
与离心泵相比单螺杆泵无需安装阀门，流量是稳定的线性流动。
Screw pump has the following advantages: 1. Compared with screw pump and centrifugal pump doesn't need to install the valve flow is stable linear flow;
和离心泵相比螺杆泵无需安装阀们流量是稳定的线性流动；
Screw pump has the following advantages: 1. Compared with screw pump and centrifugal pump doesn't need to install the valve flow is stable linear flow;
和离心泵相比螺杆泵无需安装阀们流量是稳定的线性流动；
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