When the chemical pump dosing system is run, the following matters should be paid attention to:
A. pressure point pressure
B. stroke frequency
C. lift height
D. altitude
The corrosivity of E. chemicals
When the outlet of the metering pump is atmospheric pressure, what is the way to improve the precision of the repeated metering of the pump?
The installation valve spring of the metering pump discharge valve can improve the accuracy of repeated metering, but the most effective way to improve it is to install a back pressure valve at the end of the pipeline.
How to adjust the back pressure valve of the chemical pump?
1. never exceed the maximum working pressure of the metering pump.
2. when the pump has pressure at the suction end, the pressure of the discharge end of the pump is at least 1bar higher than the pressure at the suction end.
How to choose the appropriate volume of pulse dampers?
By multiplying the metering capacity (ML) of each stroke of the metering pump by 26, the minimum volume (ML) of the pulse dampers needed to reduce the 90% pulsation can be obtained.
How to set the pressure of the safety valve?
The pressure of the safety valve can be adjusted within the rated operating pressure range of the metering pump, and it is not allowed to exceed the maximum working pressure of the metering pump. The safety valve is designed to prevent the overvoltage operation of the metering pump. For example, if the maximum working pressure of the metering pump is 3bar, the pressure of the safety valve should be set to 3bar or lower, so as to ensure the normal operation of the metering pump. Overpressure is one of the main causes of the damage of the metering pump.
If the conveyed liquid is not water, how to calculate the height of the lift?
The rated suction height of the metering pump is divided by the proportion of the measured liquid.
Under what circumstances do you use a self filled suction fluid?
It can be used in the following case with self filling suction:
1. the liquid is easy to volatilize.
2. the specific gravity of the liquid is larger.
3. when higher stroke frequency is needed;
4. when working in a high altitude area;
5. the large storage tank is needed in the field application, and it depends on the self imbibition of the metering pump.
Can you give some suggestions about the selection of the pump head? What are the usual problems in the corrosion of the pump head / seal, and how to avoid them?
In relation to the pump head of a metering pump, the common problem is when it occurs in the case of acid, chlorine, fluoride and hydrogen peroxide. Because of the difference of drug concentration and operating temperature, it is difficult to determine the material of the concrete pump head. In the measurement of fluoride, we recommend the selection of Viton®, and the sealed PVC pump head. For most applications of chlorination, it is best to choose the EPDM sealed NP (organic glass) pump head. The PTFE sealed PTFE pump head or stainless steel pump head can only be used for the measurement of hydrogen peroxide mixture. Viton® is usually used for the measurement of concentrated hydrochloric acid; the sealed organic glass pump head is used. The measurement of concentrated sulfuric acid can select the PTFE seal PTFE pump head. The chemical maker will give the relevant recommendations, or look up the ProMinent® Chemical Anticorrosion charts to determine the compatibility of the chemicals and the contact materials.
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