Atlas Copco Z4 Inlet Valve Bearing Block Kit Replacement – 2906035100

Atlas Copco 2906035100 – Z4 Inlet Valve Bearing Block Kit

The Atlas Copco 2906035100 (2906-0351-00) is a Z4 Inlet Valve Bearing Block Kit designed for the inlet-valve mechanism of compatible Atlas Copco oil-free compressor systems.

The bearing block is an important mechanical support component within the inlet-valve assembly. It supports the moving valve mechanism, maintains correct alignment of the valve shaft and associated components, and allows the inlet valve to move smoothly during compressor loading and unloading.

Working Process:

During compressor operation, the inlet valve regulates the quantity of atmospheric air entering the compressor element.

The valve mechanism is connected to moving components supported by the inlet-valve bearing block. The bearing block maintains the correct position and alignment of these components while allowing the required movement.

When the compressor is commanded to load, the inlet-valve mechanism moves toward its operating/open position. This permits the required quantity of atmospheric air to enter the compressor element.

The compressor then compresses the incoming air and supplies compressed air to the system.

When the compressor reaches the required operating condition and unloading is requested, the control system changes the position of the inlet-valve mechanism.

The valve moves toward its restricted position, reducing the amount of air entering the compressor element.

During these repeated load/unload cycles, the bearing block supports the valve mechanism and helps maintain accurate movement.

When compressed-air demand increases again, the control system commands the inlet valve toward the open position. The supported valve mechanism moves smoothly, allowing increased airflow into the compressor element.

Main Functions:

• Supports the Z4 inlet-valve mechanism.
• Maintains correct alignment of moving valve components.
• Supports the inlet-valve shaft/mechanism.
• Allows smooth valve movement.
• Helps maintain accurate inlet-air regulation.
• Supports reliable loading and unloading.
• Reduces mechanical play caused by worn support components.
• Helps restore inlet-valve performance during service.

Operating Cycle:

1. Start-up: The inlet-valve mechanism is placed in its required starting position.
2. Load Command: The control system requests compressor air production.
3. Valve Movement: The inlet-valve mechanism moves toward the open position.
4. Air Intake: Atmospheric air enters the compressor element.
5. Compression: The compressor produces compressed air.
6. Unload Command: The controller requests reduced compressor output.
7. Valve Movement: The inlet valve moves toward the restricted position.
8. Mechanical Support: The bearing block maintains alignment and supports smooth movement of the valve mechanism.
9. Reduced Air Intake: Less air enters the compressor element.
10. Reload Command: System pressure falls as compressed air is consumed.
11. Valve Reopening: The inlet mechanism moves toward the operating position.
12. Normal Production: The compressor resumes the required airflow and output.

This cycle can repeat continuously according to compressed-air demand.

Importance of the Bearing Block:

The inlet valve contains moving mechanical components that must remain correctly aligned.

The bearing block provides structural support and maintains the position of the valve mechanism.

If the bearing block becomes worn or damaged, excessive mechanical clearance can develop.

This can result in:

• Valve misalignment
• Increased mechanical play
• Uneven valve movement
• Increased friction
• Valve sticking
• Delayed valve response
• Incorrect inlet-air control

Replacing a worn bearing block helps restore the correct mechanical relationship between the valve components.

Possible Failure Conditions:

Long-term compressor operation can result in mechanical wear, contamination and deterioration of the bearing-support surfaces.

Possible failure conditions include:

• Worn bearing block
• Excessive mechanical clearance
• Misaligned valve mechanism
• Worn shaft-support area
• Restricted valve movement
• Increased friction
• Valve sticking
• Abnormal mechanical noise
• Incorrect inlet-valve positioning

Typical compressor symptoms may include:

• Compressor fails to load correctly.
• Compressor fails to unload correctly.
• Reduced air delivery.
• Slow response during loading.
• Delayed unloading.
• Unstable compressor capacity.
• Abnormal inlet-valve movement.
• Increased mechanical noise around the valve assembly.
• Excessive mechanical play.

Maintenance Procedure:

Before servicing the inlet-valve assembly, stop the compressor, isolate the electrical supply and completely depressurize the system according to the applicable Atlas Copco safety procedure.

Inspect the inlet-valve bearing block and associated components for:

• Wear
• Cracks or physical damage
• Excessive clearance
• Shaft misalignment
• Contamination
• Restricted movement
• Abnormal mechanical play

Remove the old bearing-block assembly carefully without damaging the valve housing or associated components.

Clean the mounting and mating surfaces.

Install the 2906035100 Z4 Inlet Valve Bearing Block Kit according to the applicable Atlas Copco service documentation.

Ensure that the bearing block is correctly positioned and aligned.

Check that the inlet-valve mechanism moves smoothly and freely after installation.

Verify that there is no excessive mechanical play or binding.

After assembly, restart the compressor and monitor several operating cycles.

Confirm that:

• The inlet valve moves smoothly.
• The compressor loads correctly.
• The compressor unloads correctly.
• Air delivery is normal.
• No abnormal mechanical noise is present.
• No excessive valve movement occurs.
• The compressor responds correctly to changes in air demand.

A correctly installed bearing block provides stable mechanical support and alignment for the Z4 inlet-valve mechanism.

The Atlas Copco 2906035100 Z4 Inlet Valve Bearing Block Kit therefore plays an important role in maintaining smooth valve movement, reliable inlet-air regulation and dependable compressor operation.

Part Number: 2906035100
Alternative Number: 2906-0351-00 / 2906 0351 00
Brand: Atlas Copco
Official Description: Z4 Inlet Valve Bearing Block Kit
Component Type: Inlet valve mechanical support/service kit
Application: Compatible Atlas Copco Z4 compressor inlet-valve assembly
Primary Function: Supports and aligns the inlet-valve mechanism
Secondary Function: Enables smooth and accurate valve movement
Operating Function: Provides mechanical support during repeated inlet-valve load/unload cycles
Main Benefits: Correct valve alignment, reduced mechanical play, smooth valve movement, reliable inlet-air control and dependable compressor operation.

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