Atlas Copco Seal Washer Kit Replacement – 2906043200

Atlas Copco 2906043200 – Seal Washer Kit

The Atlas Copco 2906043200 (2906-0432-00) is a Seal Washer Kit designed for compatible ZR/ZT oil-free compressors.

The kit contains replacement sealing components used during compressor maintenance and servicing. These components are installed at various threaded connections, joints and mating surfaces to maintain leak-tight compressor circuits.

During compressor operation, the air system and associated cooling/control circuits are exposed to pressure, temperature variations and vibration. Over time, sealing washers and gaskets can harden, deform or lose their sealing capability.

The 2906043200 kit provides multiple replacement seals and washers so that applicable connections can be restored during scheduled maintenance.

Working Process:

During normal operation, the ZR/ZT oil-free compressor draws atmospheric air into the compression system.

The air passes through the compression stages where its pressure and temperature increase.

Because the compressor is oil-free on the compressed-air side, maintaining the integrity of air connections, valves, coolers and associated circuits is particularly important.

Various components are joined using threaded connections, flanges and mating surfaces. Sealing washers and gaskets are compressed between these surfaces to prevent air or other operating-medium leakage.

When the correct seal is installed and the connection is tightened according to the manufacturer’s specifications, the sealing material conforms to microscopic irregularities between the mating surfaces.

This creates a leak-tight barrier while allowing the connection to withstand normal operating pressure and temperature.

The 2906043200 kit supplies different sizes and types of sealing components for applicable ZR/ZT service points.

Main Functions:

• Provides replacement sealing components.
• Helps prevent compressed-air leakage.
• Maintains pressure integrity.
• Supports reliable compressor operation.
• Helps prevent leakage at serviced connections.
• Restores sealing performance during maintenance.
• Supports proper operation of air and associated circuits.
• Helps reduce maintenance-related downtime.

Official Kit Weight: Approximately 615 g.

Official Kit Components:

Atlas Copco lists the following components:

• Gasket 60 × 68 × 2.5 – 5 pcs
• Gasket – 6 pcs
• Gasket 17 × 21 × 1.5 – 3 pcs
• Gasket 21 × 26 × 1.5 – 6 pcs
• Gasket 48 × 45 × 2 – 4 pcs
• Flat Gasket – 4 pcs
• Seal Washer M32 – 5 pcs
• Washer M26 – 4 pcs
• Gasket 30 × 38 × 2 – 2 pcs
• Washer Channel – 5 pcs
• Gasket 22 × 27 × 1.5 – 2 pcs
• Seal Washer Dowty 3/4 – 4 pcs
• Washer M16 – 8 pcs
• Gasket 13 × 20 × 1.5 – 8 pcs
• Gasket 33 × 39 × 2 – 2 pcs
• Seal Washer – 2 pcs
• Washer M10 – 4 pcs
• Seal Washer Dowty 1/4 – 15 pcs
• Seal Washer Dowty 1/2+ – 12 pcs
• Gasket 42 × 49 × 2 – 2 pcs

The component list is published in Atlas Copco’s official product catalog.

Sealing Operating Principle:

1. Connection Preparation: The applicable compressor components are separated during maintenance.
2. Surface Inspection: Mating surfaces are checked for dirt, corrosion or damage.
3. Seal Selection: The correct gasket or sealing washer is selected from the kit.
4. Seal Installation: The sealing component is positioned between the applicable mating surfaces.
5. Compression: The connection is tightened according to the applicable service procedure.
6. Surface Conformity: The seal fills minor surface irregularities.
7. Leak Prevention: The compressed seal prevents unwanted leakage.
8. Pressure Containment: The connection maintains the required operating pressure.
9. Continuous Operation: The seal remains effective during pressure, temperature and vibration cycles.

Role of Gaskets:

Gaskets are installed between suitable mating surfaces to create a sealing barrier.

During assembly, the gasket is compressed between the surfaces. This prevents air or other operating media from escaping through small imperfections between the surfaces.

The kit contains several gasket dimensions because different compressor connections require different sealing sizes.

Role of Seal Washers:

Seal washers provide sealing around applicable threaded or bolted connections.

When the connection is tightened, the washer is compressed against the mating surface and creates a pressure-resistant seal.

The kit contains multiple sizes of seal washers to accommodate different service locations.

Role of Dowty Washers:

Dowty washers combine a metallic support ring with an elastomer sealing element.

When tightened, the elastomer forms a seal against the mating surface while the metal portion provides mechanical support.

The kit contains:

• Dowty Seal Washer 3/4 – 4 pcs
• Dowty Seal Washer 1/4 – 15 pcs
• Dowty Seal Washer 1/2+ – 12 pcs

These components help provide reliable sealing at applicable connections.

Role of Channel Washers:

Channel washers provide sealing/support at designated compressor connections.

They help maintain the correct sealing condition when the corresponding connection is tightened.

Possible Failure Conditions:

Sealing components can deteriorate due to:

• High temperature.
• Pressure cycling.
• Vibration.
• Normal ageing.
• Incorrect installation.
• Over-tightening.
• Under-tightening.
• Contamination.
• Corrosion.
• Damaged mating surfaces.
• Repeated reuse of old seals.

Possible symptoms include:

• Compressed-air leakage.
• Pressure loss.
• Hissing noise.
• Oil or moisture accumulation around connections.
• Reduced compressor efficiency.
• Increased operating temperature.
• Increased energy consumption.
• Unstable compressor operation.

Similar symptoms can originate from valves, piping, coolers or other components, so proper diagnosis is required.

Maintenance Procedure:

Before servicing the compressor, perform the normal shutdown procedure.

Isolate the electrical supply and applicable pneumatic energy sources.

Completely depressurize the compressor and allow hot components to cool to a safe working temperature.

Identify the connection requiring service.

Inspect the connection for:

• Leakage.
• Damaged gasket.
• Damaged washer.
• Corrosion.
• Dirt.
• Scratches.
• Damaged mating surfaces.

Remove the old gasket or seal washer.

Clean the mating surfaces thoroughly.

Remove oil, dirt, corrosion residue and foreign material.

Select the correct replacement component from the 2906043200 Seal Washer Kit.

Install the new seal in the correct position and orientation.

Ensure:

• The correct size is selected.
• The seal is not twisted or damaged.
• The gasket is correctly seated.
• Mating surfaces are clean.
• Washers are correctly positioned.
• Connections are tightened according to the applicable Atlas Copco service procedure.

After assembly, inspect the connection.

Restart the compressor and gradually return it to normal operating conditions.

Check for:

• Air leakage.
• Pressure stability.
• Abnormal noise.
• Temperature changes.
• Connection leakage.
• Overall compressor performance.

Service Benefits:

Using the Atlas Copco 2906043200 Seal Washer Kit during appropriate maintenance helps:

• Restore sealing performance.
• Reduce compressed-air leakage.
• Maintain pressure integrity.
• Improve compressor reliability.
• Protect serviced connections.
• Reduce energy losses caused by leakage.
• Support stable compressor operation.
• Reduce unexpected maintenance and downtime.

Part Number: 2906043200
Alternative Number: 2906-0432-00 / 2906 0432 00
Brand: Atlas Copco
Official Description: Seal Washer Kit for ZR/ZT Oil-Free Compressors
Component Type: Compressor sealing/service kit
Official Listed Weight: Approximately 615 g
Application: Compatible ZR/ZT oil-free compressors
Primary Function: Replacement of gaskets, seal washers and associated washers during compressor maintenance
Operating Function: Provides leak-tight sealing at applicable compressor connections
Main Components: Gaskets, flat gaskets, seal washers, Dowty washers, channel washers and standard washers
Main Benefits: Reduced leakage, maintained pressure integrity, reliable compressor operation and reduced maintenance downtime.

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