Atlas Copco Non-Return Valve Kit Replacement – 2901200611

The Atlas Copco 2901200611 is a Non-Return Valve Kit used in oil-injected screw compressors. The valve allows oil or air to flow in the intended direction while preventing reverse flow when pressure conditions change. Atlas Copco’s official listing includes the non-return valve together with O-rings, tubing and a pipe fitting.

Working Process

1. Normal Operation – Compressor oil/air flows through the designated circuit toward the required component.
2. Valve Opens – Pressure in the correct direction opens the non-return valve.
3. Controlled Flow – The valve allows the required medium to pass through.
4. Pressure Change – When the compressor unloads or stops, the pressure difference changes.
5. Valve Closes – The non-return valve closes automatically.
6. Backflow Prevention – The closed valve prevents reverse flow into the compressor circuit.
7. System Protection – Preventing backflow helps maintain pressure and protects associated components.
8. Continuous Operation – The valve automatically repeats this function during compressor operating cycles.

Main Functions

• Prevents reverse flow.
• Maintains one-way flow direction.
• Helps maintain system pressure.
• Protects compressor components from backflow.
• Helps prevent unwanted oil/air migration.
• Restores valve sealing during maintenance.

Kit Components

Atlas Copco’s official listing specifies:

Possible Failure Symptoms

A worn or damaged non-return valve can result in:

• Reverse flow.
• Oil or air leakage.
• Pressure loss.
• Improper compressor unloading.
• Oil migration into unwanted areas.
• Increased energy consumption.
• Abnormal compressor operation.

Maintenance Procedure

1. Shut down the compressor according to the applicable Atlas Copco service procedure.
2. Isolate the electrical supply.
3. Fully depressurize the compressor.
4. Allow the equipment to cool.
5. Isolate the relevant oil/air circuit.
6. Remove the existing non-return valve.
7. Inspect the valve seat and connected tubing.
8. Clean the mating surfaces.
9. Replace the valve and sealing components using 2901200611.
10. Install the O-rings correctly without twisting or damaging them.
11. Reconnect the tube and fitting.
12. Check that the valve permits flow only in the correct direction.
13. Restart the compressor.
14. Check for leakage and verify normal pressure operation.

Technical Summary

Recommended catalog title: Atlas Copco 2901200611 – Non-Return Valve Kit for Oil-Injected Screw Compressors, 2901-2006-11.

Atlas Copco’s official catalog confirms the part number, description, 91 g weight and kit components.

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