Pump Not Working
Check air pressure and line. Air distribution valve may be clogged or frozen; install dehumidifier filter.
Technical Guide
Pump Maintenance
Guide
Preventive maintenance, common failures and troubleshooting steps in diaphragm pumps.
Maintenance Plan
Maximum Pump Lifetime with Regular Maintenance
Air diaphragm pumps are relatively easy and low-maintenance machines, but when neglected they can lead to unexpected downtime such as diaphragm rupture, valve blockage and air valve failure.
Preventive maintenance at regular intervals not only prolongs pump life but also prevents unplanned production downtime. This guide explains maintenance intervals and what to do at each maintenance step by step.
- every 500 hours: valve seal inspection and cleaning
- every 1,000 hours: diaphragm examination
- Every use: air filter and lubricant check
- Long-term storage: flush pump interior with neutral liquid
- If there is a risk of dry running: add automatic stop system
Common Faults
Pump Problems and Solutions
Low Flow Rate
The valve seat or ball may be contaminated. Remove and clean or replace the valves. Air leakage also reduces flow rate.
Fluid Leakage
The diaphragm may be damaged or torn. If fluid is visible on the air side, the diaphragm should be replaced immediately.
Excessive Noise/Vibration
Too high air pressure or loose connections cause vibration. Reduce pressure, check fixing screws.
Maintenance Questions
Pump Maintenance
Questions
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The most obvious symptom is the appearance of fluid in the air exhaust outlet. The pump starts to run erratically, the flow rate drops and the outlet pressure becomes inconsistent. An unexpected increase in air consumption can also be an indication to detect diaphragm rupture.
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Before long term storage, run the pump in clean water or a compatible solvent and clean the internal surfaces from fluid. Store in a cool and dry place to prevent diaphragm cracking. A short run test is recommended every 6 months.
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Humid air cools on pressure drop and forms ice inside the air distribution valve (Joule-Thomson effect). Solution: install a filter-regulator-lubricator (FRL) unit in the inlet line and reduce the air humidity.
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Critical spare parts: diaphragm set (1 piece), ball valves (4 pieces), valve seals, O-ring set and air distribution valve seal. Pumpport spare parts kits are available by series and model.