Atlas Copco Minimum Pressure Valve (MPV) Kit Replacement – 2910302900

Atlas Copco 2910302900 – Minimum Pressure Valve (MPV) Kit

The Atlas Copco 2910302900 (2910-3029-00) Minimum Pressure Valve Kit is a service and maintenance kit designed for the minimum pressure valve assembly of compatible oil-injected screw compressors.

The Minimum Pressure Valve (MPV) maintains the required minimum pressure inside the compressor’s air/oil separator system before allowing compressed air to flow freely toward the downstream air network.

Working Process:

During compressor start-up, the MPV remains closed or restricted. This allows pressure to build inside the separator vessel and compressor circuit.

Maintaining sufficient internal pressure is important in an oil-injected screw compressor because the pressure differential supports proper oil circulation, lubrication, cooling and oil separation.

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

During normal loaded operation, the valve remains sufficiently open to provide the required airflow while maintaining suitable compressor internal pressure.

When the compressor unloads or stops, the pressure conditions change and the valve restricts the flow. This also helps limit reverse airflow from the downstream system toward the compressor.

The 2910302900 MPV Kit replaces the sealing and fastening components required to restore the valve assembly’s proper operating condition.

Official Kit Components:

Atlas Copco lists the following components for 2910302900:

• Gasket 17 × 21 × 1.5 – 1 pc
• Flat Gasket – 4 pcs
• Flat Gasket – 1 pc
• Gasket – 1 pc
• Lock Washer (A) 6.4 × 11 × 0.7 – 4 pcs
• O-ring 57.2 × 3 – 1 pc
• Lock Washer – 2 pcs
• Gasket – 1 pc
• Gasket 13 × 20 × 1.5 – 1 pc
• Gasket 33 × 39 × 2 – 1 pc
• Ring Seal – 1 pc
• O-ring 54.5 × 3 – 1 pc

The gaskets, ring seal and O-rings provide leak-tight sealing between the MPV assembly and its mating components.

The lock washers help secure the assembled components against loosening caused by continuous compressor vibration.

Operating Cycle:

1. Start-up: The MPV restricts compressed-air discharge.
2. Pressure Build-up: Pressure rises inside the separator vessel.
3. Minimum Pressure Reached: The valve begins to open.
4. Normal Operation: Compressed air passes through the valve toward the downstream system.
5. Unloading: The valve restricts flow as compressor conditions change.
6. Shutdown: The valve helps limit reverse airflow toward the compressor.

This process ensures that the compressor maintains suitable internal pressure for reliable oil circulation and separation.

Importance of Sealing Components:

The O-rings and gaskets are critical to MPV performance. If they become hardened, flattened, cracked or damaged, air can leak through the valve assembly.

Internal leakage can interfere with the pressure differential required for proper MPV operation.

External leakage can cause compressed-air loss and may allow contaminants to enter the assembly.

The 2910302900 kit therefore renews the sealing interfaces during MPV maintenance and helps restore the valve to a reliable operating condition.

Possible Failure Conditions:

A worn or damaged MPV may produce:

• Incorrect internal compressor pressure
• Air leakage around the valve
• Poor pressure build-up during start-up
• Restricted compressed-air discharge
• Reverse airflow during unloading or shutdown
• Increased energy consumption
• Unstable compressor operation
• Poor oil circulation or separation

If the MPV opens too early, the compressor may not develop sufficient internal pressure.

If it remains excessively restricted, discharge airflow may be reduced and internal pressure may become abnormally high.

Maintenance Procedure:

Before servicing the MPV, 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 leakage, damaged gaskets, worn O-rings, damaged sealing surfaces, loose fasteners and contamination.

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

The components supplied in the 2910302900 MPV Kit should be installed in their specified positions.

All sealing surfaces must be thoroughly cleaned before assembly.

O-rings must be installed without twisting, cutting, overstretching or pinching.

Gaskets must be correctly positioned before the connections are tightened.

Lock washers must be installed correctly to maintain secure fastening.

After assembly, the MPV should be checked for correct seating and leakage.

The compressor should then 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 valve.

A correctly maintained MPV ensures controlled compressed-air discharge while maintaining the minimum internal pressure required for reliable compressor operation.

Using the Atlas Copco 2910302900 Minimum Pressure Valve Kit during the appropriate maintenance operation helps restore sealing performance, reduce leakage, maintain pressure stability and support reliable operation of oil-injected screw compressors.

Part Number: 2910302900
Alternative Number: 2910-3029-00 / 2910 3029 00
Brand: Atlas Copco
Part Description: Minimum Pressure Valve Kit
Official Description: Kit Min. Pressure Valve for Oil-Injected Screw Compressors
Component Type: Minimum Pressure Valve service kit
Official Listed Weight: 94.801 g
Main Components: Gaskets, flat gaskets, O-rings, ring seal and lock washers
Primary Function: Maintains minimum internal compressor pressure
Secondary Function: Controls compressed-air discharge and helps limit reverse airflow
Operating Function: Restricts discharge during pressure build-up and allows airflow after the required minimum pressure is reached
Main Benefits: Reliable pressure control, improved sealing, reduced air leakage, stable oil circulation and dependable compressor operation.

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