Atlas Copco Z 110–145 Inlet Valve Bearing Block Replacement – 2906049700

Atlas Copco 2906049700 – Z 110–145 Inlet Valve Bearing Block

The Atlas Copco 2906049700 (2906-0497-00) is a Z 110–145 Inlet Valve Bearing Block designed for the inlet-valve mechanism of compatible Atlas Copco oil-free compressors.

The bearing block is a precision mechanical support component that maintains the correct alignment and movement of the inlet-valve mechanism. It supports the valve mechanism and associated pivoting components, allowing the inlet valve to move smoothly and accurately during compressor loading and unloading.

Atlas Copco’s official product catalog lists the component weight as approximately 69.853 g. The official component list includes a bearing housing/block, pivot, washer, ring and locknut.

Working Process:

During compressor operation, atmospheric air enters through the compressor inlet system.

The inlet valve controls the quantity of air entering the compressor element according to the operating demand.

The inlet-valve mechanism is mechanically supported by the bearing block. The block maintains the correct position and alignment of the moving components while allowing the mechanism to pivot or move as required.

When the compressor control system requests loading, the inlet valve moves toward its open position.

This movement allows 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 required pressure is reached, the compressor control system initiates unloading or capacity reduction.

The inlet-valve mechanism changes position and restricts the incoming airflow.

During these repeated movements, the 2906049700 bearing block provides stable mechanical support and maintains alignment of the valve mechanism.

When air demand increases again, the control system commands the inlet valve toward the operating/open position.

The valve mechanism pivots smoothly on its supported components, allowing increased airflow into the compressor element.

Main Functions:

• Supports the Z 110–145 inlet-valve mechanism.
• Maintains correct mechanical alignment.
• Supports the valve pivot mechanism.
• Allows smooth inlet-valve movement.
• Helps maintain accurate inlet-air regulation.
• Supports reliable loading and unloading.
• Reduces excessive mechanical play caused by worn support components.
• Helps restore inlet-valve performance during maintenance.

Official Component Configuration:

Atlas Copco’s official catalog identifies the following components:

• Bearing Block / Bearing Housing – 1 pc
• Pivot – 1 pc
• Washer – 1 pc
• Ring – 1 pc
• Locknut – 1 pc

The complete component assembly is listed at approximately 69.853 g.

Component Functions:

The bearing block provides the primary mechanical support for the inlet-valve mechanism and maintains the correct position of the moving components.

The pivot provides the required pivoting connection for the valve mechanism and enables controlled movement.

The washer supports the mechanical connection and helps maintain the correct spacing and load distribution.

The ring retains the relevant mechanical component in its specified position.

The locknut secures the assembly and helps prevent unwanted loosening during repeated compressor operation.

Operating Cycle:

1. Start-up: The inlet-valve mechanism is placed in its required starting position.
2. Load Command: The compressor controller requests air production.
3. Valve Actuation: The inlet-valve mechanism moves toward the open position.
4. Mechanical Support: The bearing block maintains the alignment of the moving components.
5. Air Intake: Atmospheric air enters the compressor element.
6. Compression: The compressor produces compressed air.
7. Unload Command: The controller requests reduced compressor output.
8. Valve Movement: The inlet valve moves toward the restricted position.
9. Bearing Support: The bearing block maintains smooth and controlled mechanical movement.
10. Reduced Air Intake: Less atmospheric air enters the compressor element.
11. Reload Command: Increasing air demand causes the controller to request increased capacity.
12. Valve Reopening: The inlet mechanism moves toward the open operating position.
13. Normal Production: Increased airflow enters the compressor element and compressor output is restored.

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

Importance of the Bearing Block:

The inlet valve is a moving mechanical assembly and must remain accurately aligned during operation.

The bearing block provides the necessary structural support and helps maintain the correct relationship between the valve mechanism and its pivoting components.

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

This can cause:

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

Replacing a worn bearing block helps restore the mechanical accuracy of the inlet-valve assembly.

Possible Failure Conditions:

Long-term operation can result in wear of the bearing block and associated mechanical components.

Possible failure conditions include:

• Bearing-block wear
• Excessive mechanical clearance
• Pivot wear
• Damaged retaining ring
• Loose locknut
• Misalignment
• Restricted valve movement
• Increased friction
• Valve sticking
• Abnormal mechanical movement

Typical compressor symptoms may include:

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

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 bearing-block assembly for:

• Wear
• Excessive clearance
• Pivot condition
• Retaining-ring condition
• Locknut condition
• Mechanical damage
• Contamination
• Misalignment

Remove the existing bearing-block components carefully without damaging the surrounding inlet-valve assembly.

Clean the mounting and mating surfaces.

Install the 2906049700 Z 110–145 Inlet Valve Bearing Block according to the applicable Atlas Copco service documentation.

Ensure that:

• The bearing block is correctly positioned.
• The pivot is correctly installed.
• The washer is correctly positioned.
• The retaining ring is securely seated.
• The locknut is properly secured.
• The valve mechanism is correctly aligned.

Check the inlet-valve mechanism for smooth and unrestricted movement after installation.

There should be no excessive mechanical play, binding or abnormal resistance.

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

Verify:

• Smooth inlet-valve movement.
• Correct compressor loading.
• Correct compressor unloading.
• Normal air delivery.
• Stable operating pressure.
• No abnormal mechanical noise.
• No excessive valve movement.
• Correct response to changes in air demand.

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

The Atlas Copco 2906049700 therefore plays an important role in maintaining smooth inlet-valve operation, reliable airflow regulation and dependable compressor performance.

Part Number: 2906049700
Alternative Number: 2906-0497-00 / 2906 0497 00
Brand: Atlas Copco
Official Description: Z 110–145 Inlet Valve Bearing Block
Application: Compatible Atlas Copco Z 110–145 oil-free compressor systems
Component Type: Inlet valve mechanical support component
Official Listed Weight: Approximately 69.853 g
Primary Function: Supports and aligns the inlet-valve mechanism
Secondary Function: Enables controlled pivoting/movement of the valve mechanism
Main Components: Bearing block, pivot, washer, ring and locknut
Operating Function: Provides mechanical support during repeated inlet-valve load/unload cycles
Main Benefits: Correct alignment, smooth valve movement, reduced mechanical play, reliable inlet-air control and dependable compressor operation.

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