Atlas Copco Non-Return Valve Kit Replacement – 2901990818

Atlas Copco 2901990818 – Non-Return Valve Kit

The Atlas Copco 2901990818 (2901-9908-18) Non-Return Valve Kit is a service kit used to maintain the one-way flow function within the compressor or medical air system. The non-return valve prevents compressed air or gas from flowing backward through the circuit when the pressure conditions change.

Working Process:
During normal operation, compressed air or gas flows from the compressor or supply side toward the downstream medical-air system. When the upstream pressure is higher than the downstream pressure, the non-return valve opens automatically and allows the flow to pass through.

When the compressor stops, unloads, or the downstream pressure becomes higher than the upstream pressure, the valve closes automatically. This prevents the stored compressed air or gas from flowing backward toward the compressor or supply equipment.

The one-way operation helps maintain pressure within the downstream system and protects the compressor and associated components from reverse flow. It also helps prevent pressure loss and unwanted movement of air or gas through the system during shutdown.

The 2901990818 service kit contains the replacement non-return valve and two O-rings. The O-rings provide sealing between the valve and its mating components, while the non-return valve performs the actual one-directional flow-control function. Atlas Copco lists the complete kit weight as 62 g.

During maintenance, the equipment should be isolated and depressurized before the valve is removed. The existing valve and O-rings are inspected and replaced with the components supplied in the service kit. The mating surfaces should be clean and free from contamination before installation.

After installation, the valve is checked for correct flow direction and leakage. When operating correctly, the valve opens with forward pressure and closes when reverse pressure occurs, providing reliable pressure isolation.

A worn, contaminated, or damaged non-return valve can allow reverse flow, resulting in pressure loss, unstable system operation, or unwanted backflow into the compressor or supply circuit. Regular replacement of the valve and sealing O-rings helps maintain system reliability and proper pressure control.

Part Number: 2901990818
Alternative Number: 2901-9908-18 / 2901 9908 18
Part Description: Non-Return Valve Kit
Brand: Atlas Copco
Application: Medical equipment / compressed-air systems
Component Type: One-way / check valve service kit
Kit Contents: 1 Non-return valve + 2 O-rings
Official Listed Weight: 62 g
Primary Function: Allows forward flow and prevents reverse flow
Main Benefits: Maintains pressure, prevents backflow, protects system components, and supports reliable operation.

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