Problems with chemical dosing pumps
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The parameter of the pump is a pressure of 1.0 MPa, which I understand to be the maximum pressure it can achieve. However, the actual pressure reached at the device is 0.1 MPa, or around 1 kg. I would like to know whether, in this case, the outlet pressure of the chemical dosing pump is 10 kg or 1 kg
The specific pressure at the outlet can be measured using a measuring device; definitely, the outlet pressure of the pipeline cannot be used as the pump’s outlet pressure.
What I would like to ask is: which pressure rating should be used for my pump outlet pipeline and valves? Can I understand what you mean as going by my actual value, that is, the pressure required to reach the device? rather than the design pressure of the pump
The poster should follow their own approach (one that is below the pump’s design pressure), and in that case, install a safety valve on the pipeline as well. What is the set value of the backflow pressure relief valve for the metering pump?
Pump meters generally come equipped with their own backflow pressure relief valves; otherwise, how can the design pressure of the pump meter’s housing be determined? Once the valve on the user’s end is closed to stop flow, overpressure will cause the motor to trip.
If the pressure of the metering pump is 1 Mpa, then the pipes should be selected accordingly for 1 Mpa, or an effective pressure relief device should be designed to ensure pressure release. Because when the pump outlet is closed, the metering pump is capable of achieving an outlet pressure of 1.0 Mpa. Mpa is usually written this way; it might be mistaken for MPa, similar to how ml and mm are used. A pressure of 1 kilogram is typically expressed as kgf/cm2
The pump outlet pressure is 1.0 MPa; it is recommended to use pipes with PN1.6 rating. Of course, PN1.0 is generally used. At the equipment inlet, since the pipe diameter is many times larger than that of the drug delivery pipe, the pressure reading is low ； If there is a valve at the device inlet where the medication tube enters, when you close that valve, the pressure gauge on the pump side will increase to 1.0 MPa (without considering pipe losses).
The pressure at the outlet of the metering pump depends on your target pressure plus the losses due to friction along the flow path. If the backpressure is only 1 kilogram and the pressure at the pump’s outlet is 10 kilograms, where do those 9 kilograms of pressure loss go? In your case, the pressure at the pump’s outlet is just a little over 1 kilogram
Is it 10 kg of output minus the pressure loss, and then that is the pressure at the equipment?
Add a return flow control valve, pipeline pressure 1.0 MPa