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Audio version — Cleaning Air Assembly of an AODD Pump — Step-by-Step Maintenance GuideCleaning the air assembly of an Air Operated Double Diaphragm (AODD) pump is an important maintenance task that ensures pump performance and longevity. A dirty or contaminated air valve is one of the leading causes of AODD pump stalling, erratic cycling, and reduced flow — making regular cleaning essential for reliable operation.
Before performing any maintenance on an AODD pump, follow these safety precautions:
Before starting any maintenance work, ensure that the pump is fully shut down and disconnected from its air supply. Close all inlet and outlet valves to isolate the pump from the process line.
Remove the air supply hose or line from the pump's air inlet. This ensures no accidental air supply reaches the pump during maintenance.
Using an appropriate wrench, carefully remove the air valve from the pump's air inlet. Place all removed parts (bolts, O-rings, spool) in a clean tray to avoid losing small components.
Carefully check the air valve for wear, damage, swelling, cracks, or other signs of degradation — particularly the spool, O-rings, and valve seats.
Clean the air valve thoroughly using an appropriate cleaning solution — isopropyl alcohol, mineral spirits, or a manufacturer-recommended solvent. Remove all dirt, debris, dried oil residue, and contaminants from all internal surfaces and passages.
Apply a light coat of SAE 40 oil to the O-rings and spool before reassembly. Reinstall the air valve and tighten to the appropriate torque specifications per the pump's maintenance manual.
Reconnect the air supply hose or line to the pump's air inlet. Ensure the FRL unit is in place and properly adjusted before starting the pump.
Once the air assembly is cleaned and reassembled, start the pump at low pressure and gradually increase to the required operating pressure. Observe pump cycling, check for air or liquid leaks, and confirm normal flow before returning to full operation.
The air assembly — particularly the air valve and spool — controls the alternating air flow that drives the diaphragms. When these components get contaminated with moisture, debris, or dried lubricant residue, the pump can:
The recommended cleaning frequency depends on your operating environment and pump usage:
Antlia Engineering Works supplies genuine spare parts, diaphragms, air valves, and O-rings for all Antlia AODD pump models. Our engineers also provide technical support for pump maintenance and servicing.
Contact Us for Spare Parts Call +91 9819395995The air assembly should be cleaned every 3–6 months for continuous operation, or more frequently in dusty or humid environments. Clean immediately if you notice stalling, erratic cycling, or reduced flow.
The air valve gets dirty due to moisture and debris in the compressed air supply, insufficient FRL filtration, dried lubricating oil residue, and environmental dust. Using a quality FRL unit with a proper filter prevents most air valve contamination.
Use isopropyl alcohol, mineral spirits, or a manufacturer-recommended solvent compatible with the air valve materials. Avoid harsh acids or alkaline cleaners that could damage rubber O-rings or spool components. Use a soft brush or lint-free cloth.
Always shut down the pump and disconnect the air supply before starting any maintenance. Wear gloves, safety glasses, and protective clothing. If the pump was handling hazardous chemicals, ensure full decontamination and flushing before disassembly.