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(2) The pump shaft power increases with the discharge pressure increases, the efficiency of the pump also increases, but the pressure exceeds the rated value, due to increased leakage within the pump, the efficiency will decline.
　　
(3) With the increase of liquid viscosity and gas content, the pump flow rate decreases and the efficiency decreases.
　　
(4) gear pump must be equipped with safety valve.
　　
(5) gear pump flow can not be adjusted by the outlet valve, often by-pass adjustment, speed regulation method to regulate the flow.
　　
(6) No need to pump the gear pump before starting, but be sure to open the valve before starting.
　　
(7) The gear pump is commonly used to transport non-corrosive oils and other viscous media with viscosities of 1-1x10mm2 / s (404x10mm abroad). It is not suitable for transporting liquid with solid particles and liquid with high volatility and low flash point.
What is the working characteristic of gear pump?
(1) The theoretical flow Qr of the gear pump has nothing to do with the characteristics of the pipeline, only depends on the pump itself, and the pressure provided depends on the characteristics of the pipeline, and has nothing to do with the pump itself.Extraction loss of the pump when the discharge pressure of the gear pump is increased Increase, so the actual pump flow slightly lower pressure increases (Figure 2-19)