Atlas Copco Minimum Pressure Valve Kit Replacement – 2906020100

Atlas Copco 2906020100 – Minimum Pressure Valve Kit

The Atlas Copco 2906020100 (2906-0201-00) is a Minimum Pressure Valve (MPV) service kit designed for compatible oil-injected screw compressors, particularly the GA200/GA315 service range. Its primary purpose is to restore the sealing and mechanical components of the minimum pressure valve so that the compressor can maintain the required internal pressure during operation.

Atlas Copco officially describes the part as “KIT VALVE MINIMUM PRESSURE” for oil-injected screw compressors and lists a weight of 110 g. The official component list contains a seal ring, lock plate, seal ring, O-ring and GA200/315 service-kit instructions.

Working Process:

In an oil-injected rotary screw compressor, compressed air and oil enter the air/oil separator vessel after the compression process. The compressor requires a certain minimum internal pressure for proper oil separation, oil circulation, cooling and sealing.

The Minimum Pressure Valve (MPV) is installed in the compressed-air outlet path. It restricts the outlet flow during compressor start-up, allowing pressure to build inside the separator vessel.

Once the internal pressure reaches the valve’s specified opening pressure, the pressure force acting on the valve overcomes the internal closing force. The MPV then opens and allows compressed air to flow toward the aftercooler and downstream air network.

During normal loaded operation, the valve remains sufficiently open to permit the required compressed-air flow while maintaining the necessary internal pressure.

When the compressor unloads or stops, the pressure conditions change and the valve moves toward its restricted or closed position. This helps prevent uncontrolled reverse airflow from the downstream system toward the compressor.

The 2906020100 MPV Kit provides replacement components required to restore the valve’s sealing and mechanical condition.

Official Kit Components:

• Seal Ring – 1 pc
• Lock Plate – 1 pc
• Seal Ring – 1 pc
• O-ring – 1 pc
• GA200/315 Service Kit Instructions – 1 pc

The seal rings and O-ring maintain leak-tight sealing between the valve components and housing. Proper sealing is essential because leakage can interfere with the pressure differential required for correct MPV operation.

The lock plate provides mechanical retention of the relevant valve components and helps maintain the correct assembly position during continuous compressor vibration.

Operating Cycle:

1. Start-up: The MPV restricts compressed-air discharge.
2. Pressure Build-up: Internal separator pressure rises.
3. Minimum Pressure Reached: Pressure force becomes sufficient to open the valve.
4. Valve Opening: The MPV allows compressed air to flow downstream.
5. Normal Operation: The valve regulates the outlet while maintaining the required internal pressure.
6. Unloading/Shutdown: The valve restricts flow and helps prevent reverse airflow.

Maintaining the correct minimum pressure is particularly important in an oil-injected compressor because insufficient internal pressure can negatively affect oil separation and circulation.

Failure Conditions:

Over time, the sealing components may harden, deform, crack or lose elasticity.

A damaged O-ring or seal ring can cause internal or external air leakage.

A damaged lock plate or incorrectly assembled component can cause movement of the valve components and unreliable operation.

If the MPV opens too early, the compressor may fail to build sufficient internal pressure during start-up. This can interfere with proper oil separation and circulation.

If the valve remains excessively closed, compressed-air discharge can become restricted and internal pressure may rise abnormally.

If the valve does not close correctly during unloading or shutdown, downstream pressure can flow back toward the compressor.

Possible symptoms include unstable pressure, poor compressor performance, increased energy consumption, abnormal oil circulation and premature wear of internal components.

Maintenance Procedure:

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

The MPV assembly should be inspected for:

• Damaged seal rings
• Hardened or damaged O-ring
• Loose or damaged lock plate
• Contamination
• Valve wear
• Air leakage
• Abnormal valve movement

The old sealing components should be removed carefully without damaging the valve housing or mating surfaces.

The 2906020100 service kit should be used to replace the applicable seal rings, O-ring and retaining component.

All sealing surfaces must be cleaned before assembly.

The O-ring and seal rings must be installed in their correct locations without twisting, cutting, overstretching or pinching.

The lock plate must be correctly positioned and securely fitted.

The valve mechanism should be checked for free and unrestricted movement after assembly.

After reassembly, the compressor should be restarted and monitored during start-up, loading, unloading and shutdown.

The technician should verify correct pressure build-up, stable discharge pressure and absence of air leakage around the MPV assembly.

A correctly serviced minimum pressure valve maintains the required internal compressor pressure while allowing controlled delivery of compressed air to the downstream system.

Using the Atlas Copco 2906020100 Minimum Pressure Valve Kit during the appropriate maintenance operation helps restore sealing performance, pressure regulation and reliable compressor operation.

Part Number: 2906020100
Alternative Number: 2906-0201-00 / 2906 0201 00
Brand: Atlas Copco
Part Description: Minimum Pressure Valve Kit
Official Description: Kit Valve Minimum Pressure
Application: Oil-injected screw compressors
Known Application: GA200/GA315 service range
Component Type: Minimum Pressure Valve service/repair kit
Official Listed Weight: 110 g
Main Components: Seal rings, lock plate, O-ring and service instructions
Primary Function: Maintains minimum internal compressor pressure
Secondary Function: Controls compressed-air discharge and helps prevent reverse airflow
Operating Function: Restricts discharge during pressure build-up and opens when the required minimum pressure is reached
Main Benefits: Stable internal pressure, reliable oil separation, reduced leakage, controlled airflow and dependable compressor operation.

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