Atlas Copco ZT110–275 Blow-Off Valve Kit Replacement – 2906069100

Atlas Copco 2906069100 – ZT110–275 Blow-Off Valve Kit

The Atlas Copco 2906069100 (2906-0691-00) Blow-Off Valve Kit is a service kit used in the blow-off/unloading system of Atlas Copco ZT110–275 oil-free compressors. Its primary function is to safely release compressed air from the compressor’s internal circuit during unloading and shutdown, reducing internal pressure and helping the compressor transition smoothly between operating conditions.

Working Process:

During normal loaded operation, the blow-off valve remains closed. The compressor continues producing compressed air, and the compressed air is delivered through the normal discharge path toward the downstream air system.

When the compressor reaches the required operating pressure or the controller determines that the compressor should unload, the control system actuates the blow-off valve. The valve opens and provides a controlled path for compressed air trapped within the compressor circuit to escape.

This pressure-release action reduces the internal pressure acting on the compressor elements. By lowering the internal pressure during unloading, the compressor can continue running with reduced compression load and lower energy consumption.

During compressor shutdown, the blow-off valve is particularly important. Opening the valve allows residual compressed air to be discharged from the internal stages and associated piping. This helps prevent the compressor from restarting against excessive internal pressure and reduces mechanical and starting stress.

When the compressor is commanded to load again, the control system closes the blow-off valve. The internal pressure can then build normally, allowing the compressor to return to full compressed-air production.

The valve therefore performs an important unloading and pressure-release function. Correct timing of opening and closing helps maintain efficient compressor operation and protects the compressor during load, unload, and shutdown cycles.

The 2906069100 service kit is intended to restore the valve’s operating and sealing performance when its internal components become worn, contaminated, or damaged. Atlas Copco officially identifies the kit as “ZT110-275 BLOW OFF VLV KIT” and lists its weight as 128 g.

During maintenance, the compressor must be stopped, isolated, and completely depressurized before the blow-off valve is serviced. The valve assembly should be inspected for damaged sealing surfaces, worn moving components, contamination, restricted passages, and leakage.

The replacement components supplied in the kit should be installed according to the applicable Atlas Copco service procedure. Correct orientation and sealing are essential for reliable blow-off operation.

After installation, the valve should be tested through the compressor’s complete operating sequence. It should remain closed during loaded operation, open correctly during unloading, release internal pressure during shutdown, and close again when the compressor returns to loaded operation.

If the blow-off valve becomes stuck closed, the compressor may retain excessive internal pressure during unloading or shutdown, potentially causing difficult restarting and increased mechanical stress. If it remains open or leaks during loaded operation, compressed air can escape continuously, causing pressure loss, reduced capacity, and unnecessary energy consumption.

Correct maintenance of the 2906069100 Blow-Off Valve Kit helps provide controlled depressurization, smooth unloading, easier restarting, reduced compressor stress, and reliable operation of the ZT oil-free compressor.

Part Number: 2906069100
Alternative Number: 2906-0691-00 / 2906 0691 00
Part Description: ZT110–275 Blow-Off Valve Kit
Brand: Atlas Copco
Application: ZT110–275 oil-free compressors
Component Type: Blow-off / unloading valve service kit
Official Listed Weight: 128 g
Primary Function: Releases internal compressed-air pressure during unloading and shutdown
Operating Function: Controls compressor depressurization
Main Benefits: Smooth unloading, controlled pressure release, easier restarting, reduced mechanical stress, and reliable compressor operation.

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