Every minute counts when your pump is offline.
In many process plants, a worn diaphragm can stop production until it’s replaced.
Fortunately, Tapflo’s modular air-operated diaphragm pumps (AODD) are designed for quick maintenance.
With the right preparation and genuine parts, you can replace your diaphragm faster, minimize downtime, and restore full flow safely.
Key Takeaways
- Tapflo’s modular design allows fast diaphragm change without full disassembly.
- Use genuine spare kits to ensure sealing accuracy and performance.
- Regular inspection prevents sudden failure or leakage.
- Always depressurize and isolate the pump before maintenance.
Why Diaphragm Replacement Matters
Diaphragms flex continuously during pumping.
Over time, they wear out due to chemical exposure, air pressure, or abrasive media.
Replacing them at the right interval prevents leakage, air loss, and costly shutdowns.
“A properly maintained diaphragm pump can run for years. Replacing diaphragms on schedule is the easiest way to keep uptime high.”
Tapflo Aftermarket and Service
Tools and Materials You’ll Need
- Genuine Tapflo diaphragm kit (includes diaphragms and seals)
- Soft-face spanner or torque wrench
- Clean lint-free cloths
- Neutral cleaning solution
- Air filter-regulator and safety gear (gloves, goggles)
Step-by-Step Diaphragm Replacement Procedure
- Isolate and Depressurise
- Turn off the compressed air supply and disconnect the line.
- Drain and flush the pump with neutral fluid to remove residue.
- Allow all pressure to release before opening the pump.
- Disconnect Fluid Lines
- Remove suction and discharge hoses carefully.
- Wipe ports clean to prevent contamination during reassembly.
- Open Pump Chamber
- Place the pump on a clean, flat surface.
- Loosen the bolts evenly to relieve pressure on the chambers.
- Remove one side cover to access the diaphragm and air chamber.
- Remove Old Diaphragm
- Unscrew the diaphragm shaft carefully.
- Inspect for cracks, bulging, or chemical swelling.
- Clean the surrounding area with a mild detergent or neutraliser.
- Install New Diaphragm
- Fit the new diaphragm from the Tapflo kit, aligning it with the shaft and spacer.
- Tighten evenly using the torque recommended in the service manual.
- Ensure both sides are balanced for smooth stroke operation.
- Reassemble Pump
- Refit chamber covers, tightening bolts crosswise to ensure even sealing.
- Reconnect suction and discharge hoses securely.
- Test Run
- Reconnect the air line and start at low pressure.
- Check for leaks, vibration, or irregular flow.
- Gradually increase air pressure to normal operating range.
Maintenance Tips for Faster Replacement
- Keep spare diaphragm kits ready near the installation area.
- Log running hours and replace diaphragms every 12–18 months.
- Train maintenance teams with Tapflo’s service videos or manuals.
- Inspect air valve and seals while replacing the diaphragm.
- Avoid using non-original parts that may affect alignment and flow.
Common Mistakes to Avoid
- Reassembling with dirty sealing surfaces.
- Mixing old and new diaphragms.
- Over-tightening bolts or shaft connections.
- Forgetting to reconnect grounding straps (for conductive models).
Frequently Asked Questions
- How do I know it’s time to replace the diaphragm?
If you notice loss of flow, air bubbles in discharge, or air leakage, the diaphragm may be worn or punctured. - Can I replace just one diaphragm?
Always replace both diaphragms at the same time to ensure balanced operation. - What materials are available?
Tapflo offers PTFE, EPDM, Santoprene, and NBR diaphragms for different fluids. - How long does a diaphragm last?
Typically 12–18 months depending on pressure, chemical, and operating conditions. - Do I need special tools?
No special tools—just a torque wrench, soft spanner, and genuine Tapflo spares.
Next Steps
Keep your process running smoothly by maintaining a Tapflo diaphragm pump service plan.
Our Aftermarket & Service team provides spare kits, training, and on-site maintenance support to help Indian plants minimise downtime.
Visit Aftermarket & Service for manuals, videos, and service assistance.