Atlas Copco Intercooler Drain Valve Kit Replacement – 2906017900

The Atlas Copco 2906017900 is an Intercooler Drain Valve Service Kit used on applicable oil-free ZR/ZT compressors. Its purpose is to service the drain-valve assembly associated with the intercooler and maintain reliable removal of condensate from the intercooling system. Atlas Copco lists the kit for ZR/ZT 75–90 and Z45–55 machines and specifies service coverage of up to 4,000 hours.

During compression, air temperature rises and the air is cooled in the intercooler. Cooling can cause moisture to condense. The drain valve allows this accumulated condensate to be discharged while helping prevent unwanted leakage of compressed air.

Working Process

1. Air Compression – Air is compressed in the compressor element.
2. Temperature Increase – Compression increases the air temperature.
3. Intercooling – Hot compressed air passes through the intercooler and is cooled.
4. Condensation – Cooling can cause moisture to condense.
5. Condensate Collection – The condensate accumulates in the appropriate drain area.
6. Drain Valve Operation – The drain valve opens under the required operating conditions.
7. Condensate Discharge – Accumulated moisture is discharged from the intercooler circuit.
8. Valve Closure – The valve closes to prevent unnecessary compressed-air loss.
9. Continuous Operation – The drain system repeats this function during compressor operation.

Main Functions

• Services the intercooler drain valve.
• Removes accumulated condensate.
• Helps prevent water accumulation in the intercooler circuit.
• Maintains proper drainage.
• Helps minimize compressed-air leakage.
• Supports reliable compressor operation.
• Maintains the sealing condition of the drain assembly.

Official Kit Components

Atlas Copco lists these components for 2906017900:

Role of the Components

The membrane and insert form part of the drain-valve mechanism. The O-rings, gasket and Dowty seal washers maintain the required sealing around the valve and its connections.

These components help prevent:

• Compressed-air leakage
• Water/condensate leakage
• Loss of drain-valve performance
• Unwanted pressure loss

Possible Failure Symptoms

A worn or damaged drain-valve assembly may cause:

• Condensate not draining correctly.
• Water accumulation.
• Continuous air leakage.
• Pressure loss.
• Drain valve remaining open.
• Drain valve failing to open.
• Abnormal operating conditions.
• Increased compressor energy consumption.

Maintenance Procedure

1. Shut down the compressor according to the applicable Atlas Copco procedure.
2. Isolate the electrical supply.
3. Fully depressurize the compressor.
4. Allow the intercooler and drain system to cool.
5. Access and remove the drain-valve assembly.
6. Inspect the membrane, insert and sealing surfaces.
7. Remove the old O-rings, gasket and sealing washers.
8. Clean the mating surfaces.
9. Install the replacement components from 2906017900.
10. Ensure O-rings are correctly seated and not twisted.
11. Install the membrane and insert in the correct orientation.
12. Reassemble the drain valve.
13. Restart the compressor according to the applicable procedure.
14. Check that condensate drains correctly.
15. Inspect the assembly for air or water leakage.
16. Monitor compressor operation.

Service Benefits

Using the 2906017900 Intercooler Drain Valve Kit helps:

• Maintain effective condensate removal.
• Reduce water accumulation.
• Restore drain-valve sealing.
• Reduce compressed-air leakage.
• Maintain intercooler performance.
• Improve compressor reliability.
• Reduce unexpected maintenance downtime.

Technical Summary

Recommended catalog title: Atlas Copco 2906017900 – ZR/ZT 75–90 & Z45–55 Intercooler Drain Valve Kit, 2906-0179-00.

Atlas Copco’s official catalog confirms the part number, application, weight and component list.