Atlas Copco Non-Return Valve Kit Replacement – 2901107700

Atlas Copco 2901107700 – Non-Return Valve Kit

The Atlas Copco 2901107700 (2901-1077-00) Non-Return Valve Kit is a service kit used in oil-injected screw compressor systems. The non-return valve controls the direction of oil and air flow within the compressor circuit, allowing flow in the intended direction while preventing reverse flow.

Working Process:
During normal compressor operation, the oil-injected screw element requires a continuous supply and controlled circulation of oil for lubrication, cooling, and sealing. The compressor’s air and oil circuits operate under pressure, creating the pressure difference required to move oil and compressed air through the appropriate passages.

When the pressure on the inlet side of the non-return valve becomes higher than the pressure on the outlet side, the valve opens and allows the required flow to pass. The valve therefore provides a low-resistance flow path during normal operation.

When the compressor unloads or stops, the pressure conditions within the oil and air circuits change. If downstream or residual pressure becomes higher than the pressure on the valve inlet side, the non-return valve closes automatically. This prevents reverse flow of oil or compressed air through the circuit.

The one-way action is important for controlling oil migration during shutdown. It helps prevent oil from moving into areas where it is not required and assists in maintaining the correct oil balance within the compressor system. This also helps protect the compressor from unwanted reverse pressure and supports reliable restarting.

The 2901107700 kit restores the sealing and non-return function when the original valve or sealing components become worn, contaminated, or damaged. According to Atlas Copco’s official parts listing, the kit contains one non-return valve, two 12.3 × 2.4 O-rings, one 3.3 × 2.4 O-ring, and one Dowty seal washer. The official listed kit weight is 9 g.

During maintenance, the compressor should be shut down, isolated, and fully depressurized before the valve assembly is serviced. The old valve and sealing components are removed, and the valve housing and mating surfaces are inspected for contamination, damage, or wear. The replacement components are then installed in the correct orientation.

After installation, the valve should be checked for correct flow direction and leakage. A properly functioning valve opens during forward flow and closes automatically when reverse pressure occurs.

If the non-return valve becomes stuck open, contaminated, or unable to seal correctly, reverse oil or air flow may occur. This can result in oil migration, pressure loss, increased oil consumption, improper compressor shutdown behavior, or difficult restarting.

Regular inspection and replacement of the non-return valve kit helps maintain proper oil and air circulation, prevent reverse flow, protect compressor components, and support efficient and reliable compressor operation.

Part Number: 2901107700
Alternative Number: 2901-1077-00 / 2901 1077 00
Part Description: Non-Return Valve Kit
Brand: Atlas Copco
Application: Oil-injected screw compressors
Component Type: One-way/check valve service kit
Kit Contents: 1 Non-return valve + 2 O-rings 12.3 × 2.4 + 1 O-ring 3.3 × 2.4 + 1 Dowty seal washer
Official Listed Weight: 9 g
Primary Function: Allows forward flow and prevents reverse flow
Main Benefits: Controls oil/air flow, prevents backflow, reduces oil migration, and supports reliable compressor operation.

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