1. What are the key points to pay attention to when operating the dosing device?

The results showed that the working pressure, four stroke frequency, suction rise width ratio, average altitude and chemical corrosion were increased.

2. When the inlet and outlet of the metering pump is at atmospheric pressure, what method can improve the precision of repeated metering verification of the pump? The installation of valve spring yellow in the discharge valve of metering pump can improve the precision of repeated measurement and verification, but the effective improvement method is to install a back pressure valve at the end of the pipeline.

3. How to adjust the back pressure valve?

1) When the metering pump has working pressure at the suction pipe end, the working pressure at the discharge end of the pump is less than that at the suction end, which is 1 bar higher than that at the suction end.

2) Always do not have to exceed the larger pressure of the metering pump

4. If the liquid transported is not water, how to calculate the suction rise width ratio?

Divide the rated suction width ratio of metering pump into the proportion of liquid in metering verification.

5. How to set the working pressure of the valve?

The working pressure of the valve can be adjusted within the rated pressure range of the metering pump, and it is not allowed to exceed the larger pressure of the metering pump. The valve is designed to avoid over-voltage operation of the metering pump. For example, if the larger pressure of the metering pump is 3bar, the working pressure of the valve should be set to 3bar, or lower, so as to ensure the normal operation of the metering pump. Overpressure is one of the key reasons for the damage of metering pump.