Atlas Copco Inlet / Unloading Valve Assembly Replacement – 1625471002

The Atlas Copco 1625471002 is identified in compressor-parts references as an inlet valve assembly, and other catalogs also describe it as an unloading valve. The part number is also written as 1625-4710-02.

Working Process

The 1625471002 inlet valve controls the flow of atmospheric air entering the compressor’s airend. It is an important part of the compressor’s loading and unloading control system.

When the compressor is required to produce compressed air, the inlet valve opens according to the control signal. Atmospheric air can then enter the screw compression element, where the air is compressed and delivered to the compressed-air system.

When the required pressure is reached or air demand decreases, the control system changes the valve position. The inlet valve restricts or closes the incoming airflow, allowing the compressor to move into an unloaded operating condition. This prevents the compressor from unnecessarily continuing full compression when demand is low.

The valve therefore helps coordinate air intake, compressor loading, unloading and pressure regulation. Proper valve movement is essential for maintaining stable compressor operation and efficient energy use.

A worn, contaminated or damaged inlet valve can cause air leakage, incorrect loading/unloading, unstable pressure, reduced efficiency and abnormal compressor operation. Replacing the valve assembly helps restore the intended inlet-air control.

Key Benefits

• Controls air entering the compressor.
• Supports automatic loading and unloading.
• Helps maintain stable compressor pressure.
• Supports efficient compressor operation.
• Helps reduce unnecessary energy consumption.
• Provides controlled airflow to the compression element.
• Helps prevent inlet-air leakage.
• Supports reliable rotary screw compressor performance.
• Suitable for compressor repair and maintenance.

Compatibility

The 1625471002 is associated with Atlas Copco compressor inlet/unloading valve applications. Available parts references cross-reference it with 1625471000 and 1625810101, while some catalogs also list 1625471085 alongside the part.

Because different catalogs may describe the component as either an inlet valve or unloading valve, verify the compressor model and serial number before ordering.

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