Problem 1: Excessive Flow Without Outlet Pressure
- Issue: When there is no outlet pressure, the actual flow rate exceeds the rated flow rate, and adjusting the flow has little effect.
- Solution: Install a back pressure valve at the pump outlet. This stabilizes the flow rate and pipeline pressure, ensuring metering accuracy.
Problem 2: Outlet Piping Vibrations
- Issue: Significant vibration occurs in the outlet piping when the pump starts.
- Solution: Install a pulsation dampener at the pump outlet. When there is no outlet pressure, combine it with a back pressure valve. This mitigates the pulsating impact caused by the sudden acceleration of fluid, reducing pipeline vibration.
Problem 3: Flow Instability or Inability to Discharge Fluid
- Issue: Fluid cannot be discharged, pressure cannot increase, or flow is unstable.
- Solution: Common causes include a damaged diaphragm, blocked pipeline, or impurities preventing valve sealing. Install a filter to prevent impurities from entering and blocking the pipeline.
Problem 4: Self-Flow or Siphoning
- Issue (a): Liquid flows from the pump head after stopping due to the storage tank's liquid level being higher.
- Issue (b): Siphoning occurs during dosing.
- Solution: Install a back pressure valve at the outlet to prevent self-flow and siphoning by maintaining consistent outlet pressure.
Problem 5: Pressure Fluctuations Affecting Accuracy
- Issue: Large pressure fluctuations at the outlet affect metering accuracy and precision instruments.
- Solution: Install a pulsation dampener near the pump outlet, preferably with a back pressure valve. A properly sized pulsation dampener reduces over 90% of pulsations, ensuring smooth fluid flow.