Atlas Copco Blow-Off Service Kit Replacement – 2910501800

The Atlas Copco 2910501800 is a Blow-Off Service Kit designed for applicable stationary oil-free ZR/ZT compressors. It contains replacement gaskets, O-rings, seals and sealing washers used for servicing the blow-off/cooling-related valve assembly. Atlas Copco specifies the kit for service use of up to 8,000 hours.

The blow-off system is important during compressor unloading and shutdown. When the compressor changes from loaded to unloaded operation, pressure must be safely controlled and discharged from the appropriate internal circuit. The blow-off assembly allows this pressure to be released while helping prevent unwanted leakage and protecting the compressor components.

Working Process

1. Normal Compression – The ZR/ZT compressor compresses atmospheric air through its oil-free compression stages.
2. Loaded Operation – During air demand, the compressor operates normally and delivers compressed air to the system.
3. Unload Command – When the required system pressure is reached, the compressor receives an unload command.
4. Blow-Off Operation – The blow-off system opens the appropriate flow path to release trapped/internal pressure.
5. Pressure Reduction – Internal compressor pressure is reduced to the required unloaded condition.
6. Compressor Protection – Pressure relief during unloading helps reduce mechanical load during transition and restart.
7. Sealing – The gaskets, O-rings and seals in the service kit maintain leak-tight connections.
8. Reloading – When system demand increases, the compressor returns to loaded operation and the blow-off path closes appropriately.
9. Continuous Cycling – The blow-off assembly repeats this function whenever the compressor changes operating state.

Main Functions

• Services the compressor blow-off assembly.
• Provides replacement sealing components.
• Supports correct unloading operation.
• Helps release internal compressor pressure.
• Prevents unwanted air leakage.
• Maintains sealing around blow-off connections.
• Supports reliable compressor starting and unloading.
• Helps protect compressor components during operating transitions.

Official Kit Components

Atlas Copco lists the following components for 2910501800:

Role of the Sealing Components

The O-rings, gaskets and seals maintain the required sealing integrity of the blow-off assembly.

They prevent compressed air from escaping through unintended gaps and help maintain correct pressure control during loading and unloading.

Over time, sealing components can suffer from:

• Thermal ageing
• Compression set
• Hardening
• Cracking
• Pressure cycling
• Vibration
• Contamination
• Incorrect installation

Replacing these components during scheduled service helps restore reliable sealing.

Possible Failure Symptoms

A worn or leaking blow-off assembly may cause:

• Continuous air leakage.
• Improper unloading.
• Excessive pressure during unloading.
• Difficulty starting or restarting.
• Increased compressor energy consumption.
• Abnormal compressor noise.
• Unstable operating pressure.
• Increased running temperature.
• Compressor alarms or shutdown.

Maintenance Procedure

1. Shut down the compressor according to the applicable Atlas Copco service procedure.
2. Isolate the electrical supply.
3. Depressurize the compressor completely.
4. Allow hot components to cool.
5. Isolate the relevant air connections.
6. Remove the blow-off assembly.
7. Inspect the valve and sealing surfaces.
8. Remove old O-rings, gaskets and seals.
9. Clean the mating surfaces.
10. Install the new components supplied in 2910501800.
11. Ensure O-rings are correctly seated and not twisted or pinched.
12. Install gaskets and sealing washers in their correct positions.
13. Reassemble the blow-off system according to the applicable Atlas Copco procedure.
14. Restart the compressor.
15. Verify proper loading and unloading.
16. Check for air leakage.
17. Monitor pressure and compressor operating conditions.

Service Benefits

Using the 2910501800 Blow-Off Service Kit during the appropriate service interval helps:

• Restore blow-off system sealing.
• Maintain correct unloading operation.
• Reduce compressed-air leakage.
• Support reliable compressor starting.
• Maintain pressure-control performance.
• Reduce unnecessary energy losses.
• Improve compressor reliability.
• Reduce unexpected downtime.

Technical Summary

Recommended catalog title: Atlas Copco 2910501800 – Service Kit Blow-Off for ZR/ZT Oil-Free Compressors, 2910-5018-00, 8,000-Hour Service Kit.

Compatibility note: Confirm the compressor model and serial number before ordering. Atlas Copco recommends using the machine serial number to access the applicable Spare Parts Book and verify the exact part.

Disclaimer: All manufacturer names, trademarks, model numbers, and part numbers are used solely for identification and compatibility purposes. Our products are high-quality aftermarket replacement products and are not manufactured, sponsored, endorsed, or authorized by the original equipment manufacturer (OEM). All trademarks remain the property of their respective owners.