Atlas Copco Air Unloader / Inlet Regulator Assembly RH5 NR Replacement – 2202260953

Atlas Copco 2202260953 – Air Unloader / Inlet Regulator Assembly RH5 NR

The Atlas Copco 2202260953 (2202-2609-53) Air Unloader / Inlet Regulator Assembly is a pneumatic control component used in oil-injected rotary screw compressors. Its main function is to control the compressor’s air intake and unloading operation according to the required system pressure.

Working Process:

During compressor start-up, the unloader keeps the inlet system in a closed or restricted condition. This reduces the initial compression load and allows the compressor motor and screw element to reach operating speed with reduced starting resistance.

Once the compressor reaches operating speed, the control system supplies the required pneumatic signal to the unloader assembly. The inlet mechanism opens, allowing atmospheric air to enter the compressor air end.

The screw element then compresses the incoming air and sends the compressed air into the air/oil separation system. During loaded operation, the unloader regulates the inlet airflow according to the compressor’s required capacity.

When compressed-air demand increases and system pressure falls, the control system maintains the inlet valve in the required open position so the compressor can produce more compressed air.

When the required discharge pressure is reached, the controller initiates the unloading sequence. The unloader changes the pneumatic condition of the inlet regulator and moves the inlet mechanism toward the closed or restricted position. This reduces the quantity of air entering the screw element and consequently reduces the compression load.

The compressor can then continue running in an unloaded condition while consuming significantly less power. This load/unload process prevents unnecessary compressed-air production when downstream demand is low.

The 2202260953 assembly therefore performs an important role in compressor capacity regulation, unloading, and pressure control. Atlas Copco officially describes the part as “AIR UNLOADER REG.ASPIR.RH5 NR” and lists it for oil-injected screw compressors. The official listed weight is 269.887 g.

During maintenance, the compressor should be stopped, isolated, and completely depressurized before the unloader assembly is serviced. The valve body, actuator mechanism, seals, air passages, and moving components should be inspected for contamination, wear, damage, and leakage.

The assembly should move freely and seal correctly. Any damaged sealing components or worn internal parts should be replaced according to the applicable Atlas Copco maintenance procedure.

After installation, the compressor should be tested through its complete operating cycle. The unloader should provide a low-load start, allow correct loading, unload when the required pressure is reached, and return to the loaded condition when system pressure decreases.

A faulty unloader can cause difficult starting, failure to load, failure to unload, continuous air intake, excessive power consumption, unstable pressure, or air leakage.

Correct operation of the 2202260953 Air Unloader / Inlet Regulator Assembly helps provide smooth compressor starting, accurate airflow control, efficient load/unload operation, stable pressure, reduced energy consumption, and reliable compressor performance.

Part Number: 2202260953
Alternative Number: 2202-2609-53 / 2202 2609 53
Brand: Atlas Copco / Chicago Pneumatic
Part Description: Air Unloader Regulator ASPIR. RH5 NR / Unloader Assembly
Component Type: Pneumatic inlet-air and unloading control assembly
Application: Oil-injected screw compressors
Official Listed Weight: 269.887 g
Primary Function: Controls compressor inlet airflow and unloading
Secondary Function: Reduces compressor load during unloaded operation
Main Benefits: Smooth starting, stable pressure control, reduced unloaded power consumption, and reliable compressor operation.

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