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。
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；
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