通过实验研究，观察分析了流量测量管路中空间弯头下游有(或无)整流器时对孔板流量计流量系数的影响。
The flow coefficients of the orifice-plate flowmeters are experimentally studied with or without a rectifier at the lower reach of a space elbow in the measuring pipe of flow.
为了实现润滑脂在管路中输送的无流量脉动，研制了一种低流量脉动泵。
In order to realize the transportation of grease without flux pulse in the tube, a low-flux pulse pump was developed.
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