Atlas Copco Inlet Valve Service Kit Replacement – 2906022400

Atlas Copco 2906022400 – Inlet Valve Service Kit

The Atlas Copco 2906022400 (2906-0224-00) is an Inlet Valve Service Kit used for maintenance and servicing of compatible Atlas Copco rotary screw compressor inlet-valve assemblies. Parts catalogs specifically identify the part as “KIT, VALVE INLET SERVICE.”

The inlet valve is responsible for controlling the quantity of atmospheric air entering the compressor element. By regulating the inlet airflow, the compressor can operate according to the required air demand and transition between loaded and unloaded conditions.

Working Process:

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

When compressed air is required, the control system positions the inlet valve toward the open position. This allows the required quantity of atmospheric air to enter the compressor element.

The screw compressor element compresses the incoming air and delivers the compressed air into the downstream air/oil separation and discharge system.

When the required system pressure is reached, the compressor control system initiates the unloading sequence.

The inlet valve moves toward a restricted or closed position. This reduces the amount of air entering the compressor element and consequently reduces compressor air production.

When downstream air consumption causes the system pressure to decrease, the control system commands the inlet valve toward the open position again.

The compressor resumes normal air intake and compression.

This automatic regulation of inlet airflow allows the compressor to respond to changing compressed-air demand while helping reduce unnecessary energy consumption.

Main Functions:

• Controls compressor inlet-air flow.
• Supports compressor loading and unloading.
• Regulates compressor capacity.
• Helps maintain stable operating pressure.
• Reduces unnecessary air intake during unloading.
• Supports efficient compressor operation.
• Restores inlet-valve sealing and operating performance during servicing.

Operating Cycle:

1. Start-up: The inlet-valve mechanism is placed in its required starting position.
2. Loading: The valve opens to permit atmospheric air into the compressor element.
3. Compression: The screw element compresses the incoming air.
4. Pressure Build-up: System pressure increases as compressed air is produced.
5. Unload Command: The controller activates unloading after the required pressure condition is reached.
6. Inlet Restriction: The inlet valve moves toward the restricted/closed position.
7. Reduced Air Intake: Compressor output decreases.
8. Pressure Reduction: Downstream air consumption lowers system pressure.
9. Reload Command: The controller commands the inlet valve toward the open position.
10. Normal Compression: The compressor resumes the required air intake and production.

The cycle repeats automatically according to air demand.

Service Kit Function:

The 2906022400 service kit is used during maintenance when serviceable components of the inlet valve have become worn, damaged, contaminated or deteriorated.

The kit helps restore the valve’s sealing characteristics and correct operating movement.

Replacing worn service components can prevent unwanted air leakage and ensure that the inlet valve responds correctly to the compressor control system.

A properly serviced inlet valve should move smoothly between its operating positions and maintain the required sealing performance.

Possible Failure Conditions:

With prolonged compressor operation, inlet-valve components can experience wear, contamination, seal deterioration or mechanical sticking.

Possible symptoms include:

• Compressor fails to load correctly.
• Compressor fails to unload correctly.
• Reduced compressed-air delivery.
• Slow pressure build-up.
• Excessive power consumption.
• Unstable operating pressure.
• Delayed valve response.
• Air leakage around the inlet valve.
• Valve sticking.
• Abnormal load/unload cycling.

If the inlet valve remains too closed during loading, insufficient air may enter the compressor element and compressor output can decrease.

If the valve remains too open during unloading, the compressor may continue drawing and compressing unnecessary air, increasing energy consumption.

Maintenance Procedure:

Before servicing the inlet valve, the compressor must be stopped, electrically isolated and completely depressurized according to the applicable Atlas Copco safety procedure.

Inspect the inlet-valve assembly for:

• Worn sealing components
• Damaged O-rings or seals
• Contamination
• Mechanical wear
• Valve sticking
• Damaged mating surfaces
• Restricted movement
• Air leakage
• Abnormal load/unload response

Remove the worn service components carefully without damaging the valve housing or associated compressor components.

Install the components supplied with the 2906022400 Inlet Valve Service Kit according to the applicable Atlas Copco service instructions.

Clean all mating and sealing surfaces before assembly.

Replacement sealing components must be installed correctly without twisting, cutting, overstretching or pinching.

Ensure that all valve components are correctly positioned and secured.

Check the valve mechanism for smooth movement before returning the compressor to service.

After assembly, restart the compressor and observe several load/unload cycles.

Verify that:

• The inlet valve opens correctly during loading.
• The valve restricts/closes correctly during unloading.
• Compressor pressure builds normally.
• Air delivery is satisfactory.
• No abnormal air leakage is present.
• Valve movement is smooth.
• The compressor changes correctly between loaded and unloaded operation.

A correctly serviced inlet valve provides reliable control of compressor air intake and supports efficient compressor operation.

Using the Atlas Copco 2906022400 Inlet Valve Service Kit during appropriate maintenance helps restore valve sealing, airflow regulation, movement and reliable load/unload performance.

Part Number: 2906022400
Alternative Number: 2906-0224-00 / 2906 0224 00
Brand: Atlas Copco
Official/Parts Description: Kit, Valve Inlet Service
Also Referenced As: Inlet Valve Service Kit
Component Type: Compressor inlet-valve service kit
Application: Compatible Atlas Copco rotary screw compressors
Primary Function: Controls atmospheric air entering the compressor element
Secondary Function: Supports compressor loading, unloading and capacity control
Operating Function: Regulates inlet airflow according to compressor control requirements
Main Benefits: Reliable inlet-air control, improved sealing, stable pressure control, proper load/unload response and efficient compressor operation.

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