Atlas Copco Loading Valve Kit Replacement – 2910360700

Atlas Copco 2910360700 – Loading Valve Kit

The Atlas Copco 2910360700 (2910-3607-00) is a Loading Valve Kit used in compatible Atlas Copco rotary screw compressor systems. It is also referred to as a Loading Valve Service Kit or, in some parts catalogs, a valve unloading/loading kit.

The loading valve forms part of the compressor’s pneumatic control system. Its primary function is to control the compressor’s transition between loaded and unloaded operating conditions by regulating the relevant control-air circuit.

Working Process:

During the unloaded condition, the compressor control system keeps the loading circuit in a position that prevents the compressor from operating at full air-production capacity.

When compressed air demand increases and the system pressure falls to the programmed load pressure, the compressor control system sends a loading command.

The loading valve changes position and allows the required control pressure to reach the compressor’s loading mechanism.

This causes the compressor inlet/control system to move toward the loaded condition.

Atmospheric air is then admitted into the compressor element, allowing the screw element to compress air and supply the compressed-air network.

As system pressure rises and reaches the programmed unload pressure, the controller reverses the control command.

The loading/unloading control circuit changes state, reducing compressor air production and placing the compressor into its unloaded condition.

The process automatically repeats according to compressed-air demand.

Main Functions:

• Controls compressor loading.
• Supports automatic load/unload operation.
• Regulates pneumatic control pressure.
• Helps control compressor inlet operation.
• Allows the compressor to respond to changing air demand.
• Helps maintain stable system pressure.
• Supports efficient compressor operation.

Operating Cycle:

1. Start-up: The control system places the compressor in its required starting condition.
2. Load Demand: System pressure falls below the load set point.
3. Loading Command: The controller activates the loading circuit.
4. Valve Operation: The loading valve changes position and permits the required control pressure to reach the loading mechanism.
5. Compressor Loads: The inlet/control system moves toward the loaded position.
6. Air Compression: The screw element compresses incoming air.
7. Pressure Build-up: System pressure increases.
8. Unload Command: The controller initiates unloading when the unload set point is reached.
9. Reduced Output: The control system changes the valve condition and reduces compressor air production.
10. Cycle Repeats: The compressor returns to loading when air demand causes pressure to fall again.

Role in the Pneumatic Control System:

The loading valve does not normally perform the actual air compression. Instead, it controls the pneumatic signal that determines how the compressor operates.

A correctly functioning valve provides the required control pressure when a load command is received and changes the control circuit correctly when an unload command is given.

Because compressor loading depends on the correct pneumatic signal, valve leakage, sticking or internal wear can directly affect compressor performance.

Possible Failure Conditions:

Long-term operation can result in contamination, seal deterioration, internal wear or restricted valve movement.

If the loading valve does not respond correctly, the compressor may fail to enter the loaded condition.

If the valve leaks, insufficient control pressure may reach the loading mechanism.

If the valve sticks in the wrong position, the compressor may remain unloaded or may not unload correctly.

Typical symptoms may include:

• Compressor fails to load.
• Compressor fails to unload correctly.
• Slow pressure build-up.
• Reduced compressed-air output.
• Unstable system pressure.
• Delayed load response.
• Excessive or abnormal load/unload cycling.
• Pneumatic control-air leakage.
• Valve sticking.
• Compressor operating continuously in an incorrect condition.

Maintenance Procedure:

Before servicing the loading valve, the compressor must be stopped, electrically isolated and completely depressurized according to the applicable Atlas Copco safety procedure.

Inspect the valve and surrounding pneumatic circuit for:

• Air leakage
• Damaged sealing components
• Contamination
• Restricted movement
• Worn internal components
• Damaged connections
• Incorrect control pressure
• Abnormal load/unload response

Remove the worn service components carefully without damaging the valve body or connected pneumatic components.

Install the 2910360700 Loading Valve Kit according to the applicable Atlas Copco service documentation.

Clean all mating and sealing surfaces before assembly.

Replacement seals must be installed correctly without twisting, cutting or damaging them.

Ensure that pneumatic connections are clean and secure.

After assembly, check the valve for correct movement and verify that the control circuit is free from abnormal leakage.

Restart the compressor and monitor several complete loading and unloading cycles.

The technician should verify:

• Correct response to a load command.
• Correct response to an unload command.
• Normal pressure build-up.
• Stable operating pressure.
• No abnormal pneumatic leakage.
• Smooth load/unload transition.
• Correct compressor air delivery.

A properly functioning loading valve allows the compressor control system to respond accurately to changing air demand.

Using the Atlas Copco 2910360700 Loading Valve Kit during appropriate maintenance helps restore pneumatic control, valve response, sealing performance and reliable compressor loading operation.

Part Number: 2910360700
Alternative Number: 2910-3607-00 / 2910 3607 00
Brand: Atlas Copco
Part Description: Loading Valve Kit
Also Referenced As: Loading Valve Service Kit / Loading Valve Kit for Regulator
Component Type: Compressor pneumatic loading/control valve kit
Known Application: Compatible Atlas Copco GA/XA rotary screw compressor systems
Primary Function: Controls compressor loading through the pneumatic control circuit
Secondary Function: Supports automatic load/unload operation and compressor capacity control
Operating Function: Changes the control-air circuit to initiate or release compressor loading
Main Benefits: Reliable compressor loading, stable pressure control, accurate pneumatic response, reduced operating problems and dependable compressor performance.

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