How to choose a metering pump
What information is needed to properly select a metering pump?
1. The flow rate of the liquid being metered.
2. The main characteristics of the liquid being metered, such as chemical corrosivity, viscosity and specific gravity.
3. Back pressure of the system. Submersible pump
4. Appropriate suction height.
5. Other options required, such as analog control, pulse volume control, flow monitoring, and timers.
What are the main advantages of electromagnetically driven metering pumps? Horizontal centrifugal pump electric self-priming pump The dynamic metering pump has only one moving part - the armature shaft. In general, the less moving parts, the more reliable the metering pump will work. The metering pump is ideal for low flow, low pressure applications and has good compensation when the supply voltage fluctuates. What are the advantages of a metering pump with a fixed stroke length and a variable frequency compared to a mechanical seal and a metering pump that changes the stroke length? By calibration, the dose per stroke is known. Therefore, the total dosing and metering pump is calculated (the amount of dosing = the amount of dose per stroke * frequency). The total magnetic pump dosage is linear with frequency (50% frequency = 50% dosage). By external pulse or analog control, the sewage pump can be dosed from minimum to maximum within one second. In addition, it is much less expensive than motor-driven small pump length adjustment. How to use the performance curve of the metering pump? 1. Find the performance curve corresponding to the metering pump selected. 2. Grind the current back pressure in the gel below. 3. Determine the correction factor, take the back pressure value in bar, extend up to the curve, and read the correction factor value vertically to the left at the intersection. Rotary vane vacuum pump 4. Divide the required dosing value by the corrected factor value to obtain the value in ml/min. or L/h. 5. Place the calculation result in the middle of the water supply ring vacuum pump. When placing this value on the dosing scale, a ruler can be used to find the stroke length setting and stroke frequency setting.
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