Atlas Copco Check Valve Kit Replacement – 2906067100

Atlas Copco 2906067100 – Check Valve Kit

The Atlas Copco 2906067100 (2906-0671-00) Check Valve Kit is a service and repair kit used in compatible Atlas Copco oil-free compressor systems. Its primary function is to allow compressed air to flow in the required direction while preventing reverse airflow from the downstream system back toward the compressor.

Working Process:

During normal compressor operation, compressed air generated by the compressor flows through the discharge circuit toward the downstream air network. The check valve opens when the pressure on the compressor side becomes higher than the downstream pressure.

The pressure differential moves the internal valve element away from its sealing seat, creating a flow passage. Compressed air can then pass through the valve toward the receiver, air-treatment equipment, or downstream process system.

During loaded operation, the check valve remains open while sufficient forward pressure is available. It provides a controlled flow path while maintaining pressure separation between the compressor and downstream system.

When the compressor unloads or stops, the pressure differential changes. Downstream pressure can remain higher than the pressure on the compressor side. The valve then returns to its closed position and prevents compressed air from flowing backward toward the compressor.

This non-return function is important during unloading and shutdown because it prevents reverse pressurization of the compressor discharge circuit and unwanted pressure equalization through the compressor.

The 2906067100 is identified by parts references as a Check Valve Kit. One parts catalog specifically lists it as “ZR55-90 CHECK VALVE KIT,” while another identifies it as a Check Valve Repair Kit for ZT75. This indicates that exact application should be confirmed against the compressor model and serial number before installation.

The check-valve assembly contains mechanical and sealing components that work together to provide reliable one-way airflow. The valve element performs the flow-control function, while springs and sealing components provide the required closing action and leak-tight operation.

During continuous operation, the valve is exposed to pressure fluctuations, vibration, temperature changes, contamination, and repeated opening and closing cycles. Over time, the valve seat, moving components, springs, or seals can become worn or damaged.

A defective check valve may fail to close completely, allowing compressed air to flow backward after the compressor unloads or stops. This can result in pressure loss, abnormal shutdown behavior, unwanted pressure equalization, and additional stress on compressor components.

If the valve becomes stuck closed or excessively restricted, it can create additional pressure drop and interfere with normal compressed-air delivery.

During maintenance, the compressor must be stopped, electrically isolated, completely depressurized, and allowed to cool before the check-valve assembly is serviced.

The existing valve assembly should be inspected for worn or damaged valve surfaces, contamination, corrosion, deformation, damaged sealing components, and restricted movement. Internal passages and mating surfaces should be cleaned before installation of the replacement service components.

The components supplied with the 2906067100 Check Valve Kit should be installed in their correct positions and orientations according to the applicable Atlas Copco service documentation.

After reassembly, the valve should be checked for proper movement and leakage. The compressor should then be operated through its start-up, loaded, unloaded, and shutdown cycles.

During testing, the valve should open smoothly during forward airflow and close securely when the pressure differential reverses.

A properly functioning check valve helps maintain pressure stability, prevents reverse airflow, protects the compressor discharge system, and supports reliable oil-free compressor operation.

Using the Atlas Copco 2906067100 Check Valve Kit during scheduled maintenance helps restore one-way airflow control, proper sealing, reliable pressure behavior, and dependable compressor performance.

Part Number: 2906067100
Alternative Number: 2906-0671-00 / 2906 0671 00
Brand: Atlas Copco
Part Description: Check Valve Kit / Check Valve Repair Kit
Component Type: Check / non-return valve service kit
Application: Atlas Copco oil-free compressor systems
Known Applications: ZR55–90; some parts references also associate the kit with ZT75
Primary Function: Allows forward compressed-air flow and prevents reverse flow
Operating Function: Controls one-way airflow during normal operation, unloading, and shutdown
Maintenance Function: Restores worn check-valve and sealing components
Main Benefits: Reverse-flow protection, pressure stability, reduced leakage, compressor protection, and dependable operation.

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