Atlas Copco Check Valve Kit Replacement – 2901110000

The Atlas Copco 2901110000 Check Valve Kit is a service kit used to restore the correct operation and sealing of a compressor check valve. The check valve allows compressed air to flow in the required direction while preventing reverse flow when the compressor unloads or stops.

Working Process

1. Air Compression – The compressor produces compressed air.
2. Forward Flow – During operation, the check valve opens when upstream pressure is sufficient.
3. One-Way Operation – Compressed air passes toward the receiver/system while reverse flow is restricted.
4. Pressure Differential – When compressor pressure falls, the valve closes automatically.
5. Backflow Prevention – Closing the valve prevents stored compressed air from flowing back toward the compressor.
6. Component Wear – Valve sealing surfaces, spring and internal components can wear over time.
7. Overhaul – During maintenance, worn check-valve components are replaced using 2901110000.
8. Testing – After installation, the valve is checked for correct opening, closing and leakage.

Main Functions

• Provides one-way compressed-air flow.
• Prevents reverse airflow.
• Helps maintain system pressure.
• Protects the compressor during shutdown/unloading.
• Restores proper check-valve sealing.
• Supports reliable compressor operation.

Typical Failure Symptoms

A worn or damaged check valve may cause:

• Reverse airflow.
• Pressure loss after shutdown.
• Compressor difficulty starting.
• Excessive pressure fluctuations.
• Air leakage through the valve.
• Abnormal compressor loading/unloading behavior.

Maintenance Procedure

1. Shut down the compressor according to the applicable Atlas Copco service procedure.
2. Isolate and lock out the electrical supply.
3. Fully depressurize the compressor and connected air system.
4. Allow the equipment to cool.
5. Access and remove the check-valve assembly.
6. Inspect the valve body, seat and internal components.
7. Remove worn service components.
8. Clean the valve and mating surfaces.
9. Install the replacement components from 2901110000.
10. Ensure the valve moves freely and seals correctly.
11. Reassemble the check valve.
12. Reconnect the associated piping.
13. Gradually pressurize the system.
14. Check for leakage and reverse flow.
15. Restart the compressor.
16. Verify normal loading, unloading and pressure retention.

Technical Summary

Recommended catalog title:
Atlas Copco 2901110000 – Check Valve Kit, 2901-1100-00.

The part number is consistently identified as a Check Valve Kit in multiple Atlas Copco parts catalogs and supplier references.

Note: Some third-party catalogs describe the kit as an element exchange LP kit, which conflicts with the more consistent references identifying it as a Check Valve Kit. For that reason, I would use “Check Valve Kit” as the catalog description and verify the exact machine/serial number before ordering.