How to Resolve Common Issues of SEKO Mechanical Diaphragm Dosing Pumps

Troubles & Solutions

Understanding and mastering the common issues and solutions of SEKO mechanical diaphragm dosing pumps is crucial for ensuring stable equipment operation, extending its service life, and reducing maintenance costs. Since dosing pumps play a vital role in precise chemical dosing in the fields of water treatment, chemical, and power industries, any malfunction may result in process interruptions or dosing inaccuracies, affecting the overall performance of the system. By promptly identifying root causes and implementing effective measures, unplanned downtime can be minimized, equipment operating efficiency and safety can be enhanced, ensuring continuous, reliable production processes. Additionally, standardized troubleshooting and routine maintenance contribute to enhancing operators' professional competence and reducing long-term operational risks.

Technician is performing inspection on a mechanical diaphragm dosing pump.

Table 1: Common Issues and Solutions for SEKO Mechanical Diaphragm Metering Pump
Fault Description	Possible Causes	Solutions
Pump fails to operate.	Inlet or outlet check valve is damaged or contaminated by fluid.	Clean or replace the check valve.
	Chemical solution level in the dosing tank is too low	Inject the chemical solution into the chemical tank.
	Discharge pipeline is blocked.	Clean and clear the pipeline.
	Motor is disconnected from the power supply.	Reconnect the power supply.
	Motor power cable is disconnected.	Identify the disconnection point and repair it.
	Stroke adjustment is set to the zero position.	Readjust the stroke setting.
	Unstable power supply voltage has caused motor burnout.	Test and calibrate; repair or replace the motor.
Low flow rate	Residual gas in the pump chamber or pipeline.	Discharge the gas.
	Suction filter and suction pipeline are blocked.	Clean the filter or remove the blockage.
	Suction side position is too high.	Refix the pump position to reduce suction lift.
	Fluid temperature is excessively high.	Cool the fluid.
	Fluid viscosity is excessively high.	Reduce viscosity (e.g., by heating or diluting the fluid).
	The pump valve is excessively dirty or damaged.	Clean the valve or replace it with a new one.
	The suction pipeline diameter is too small.	Check the length and diameter of the suction pipeline.
	Stroke length setting is incorrect.	Check and readjust the stroke length.
	Leakage has occurred at the sealing area.	Inspect the seal for damage; replace immediately if necessary.
	Pump operating speed is incorrect.	Ensure the power supply voltage and frequency match the specifications on the motor nameplate.
Flow rate is excessively high.	Discharge pressure is lower than suction pressure.	Install a back pressure valve.
Flow rate is excessively high.	Incorrect stroke length.	Inspect and adjust the stroke length.
Motor overheating.	Excessive discharge pressure.	Check the pressure relief valve setting.
	Improper discharge pipeline size.	Inspect the length and diameter of the discharge pipeline.
	Power supply does not meet the motor's electrical specifications.	Ensure the power supply is properly matched to the motor.
Operational noise.	Incorrect electrical connection.	Inspect and correct the electrical connection.
	Insufficient lubrication of the mechanical assembly or gearbox.	Apply grease.
	Severe damage to the mechanical assembly or gearbox.	Thoroughly repair the mechanical assembly or gearbox.
Pipeline vibration.	Pipeline is too narrow.	Replace with a larger diameter pipeline.
Pipeline vibration.	Pulsation damper malfunction or insufficient pressure.	Repair or recalculate the damper volume.

The above summarizes common issues, possible causes, and solutions for SEKO mechanical diaphragm dosing pumps. If your dosing pump experiences similar issues during operation, you may refer to these maintenance procedures. For unresolved or other issues, please feel free to contact us.