Atlas Copco Non-Return Valve Kit Replacement – 2901200611

Atlas Copco 2901200611 – Non-Return Valve Kit

The Atlas Copco 2901200611 (2901-2006-11) Non-Return Valve Kit is a service kit used in oil-injected screw compressor systems. Its primary function is to allow compressed air or control flow in the required direction while preventing reverse flow when compressor pressure conditions change.

Working Process:
During normal compressor operation, compressed air flows from the compressor toward the downstream air system. When the pressure on the inlet side of the non-return valve is higher than the downstream pressure, the valve opens and permits the required flow to pass through the circuit.

The valve automatically responds to the pressure difference across it. As forward pressure increases, the internal valve element moves to the open position, allowing compressed air to continue toward the downstream system.

When the compressor unloads or stops, the pressure conditions change. Downstream pressure can become higher than the pressure on the compressor side. The non-return valve then closes automatically, preventing compressed air from flowing backward into the compressor.

This one-way operation helps maintain pressure in the downstream system and protects the compressor from reverse airflow. It can also help prevent downstream air pressure from forcing compressor lubricant back into the air end during shutdown.

The 2901200611 kit restores the valve’s sealing and flow-control function when the original valve or associated sealing components become worn, contaminated, or damaged. Atlas Copco’s official listing shows the kit includes a non-return valve, O-rings, tube, and pipe fitting, with an official listed weight of 91 g.

During maintenance, the compressor should be shut down, isolated, and completely depressurized before the non-return valve is serviced. The existing valve and seals are removed, and the valve body, connection points, and mating surfaces are inspected and cleaned.

The replacement components are then installed in the correct flow direction. Particular attention should be given to the O-rings and pipe connections because proper sealing is necessary to prevent leakage.

After installation, the valve should be checked for correct forward flow and complete closure under reverse-pressure conditions. The compressor should then be tested during starting, loading, unloading, and shutdown.

If the non-return valve becomes stuck open, contaminated, or unable to seal correctly, reverse airflow may occur. This can cause pressure loss, unwanted backflow, oil migration, unstable compressor operation, or difficulty maintaining system pressure.

Correct maintenance of the 2901200611 Non-Return Valve Kit helps maintain one-way airflow, preserve downstream pressure, reduce reverse flow, protect compressor components, and support reliable compressor operation.

Part Number: 2901200611
Alternative Number: 2901-2006-11 / 2901 2006 11
Part Description: Non-Return Valve Kit
Brand: Atlas Copco
Application: Oil-injected screw compressors
Component Type: One-way / check valve service kit
Official Listed Weight: 91 g
Kit Components: Non-return valve, O-rings, tube, and pipe fitting
Primary Function: Allows forward flow and prevents reverse flow
Main Benefits: Maintains pressure, prevents backflow, protects the compressor circuit, and supports reliable operation.

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