Control Valves

How Does a Genie Unloader Valve Work?

On a suitable engine-driven compressor, the unloader valve responds to pressure in the air receiver. When the upper pressure setting is reached, the compressor is unloaded so the engine can continue running without compressing air against the full system load.

As receiver pressure falls to the lower operating setting, the valve allows the compressor to return to loaded operation.

Choosing the Correct Control Valve

1/2" Genie Unloader Valve Features

• 1/2" compressor unloader valve
• Adjustable cut-in and cut-out pressure settings
• Integrated non-return valve
• Additional port for accelerator or actuator connection
• Suitable for compatible petrol and diesel driven piston compressors
• Stated airflow range of 0.18 m³/min to 3 m³/min

Integrated Non-Return Valve

The 1/2" PUV170 incorporates a non-return valve as part of its control arrangement. This helps prevent receiver air flowing back towards the compressor pump when the compressor is unloaded.

Because the non-return and unloading functions form part of the compressor operating system, the replacement valve should be correctly matched rather than substituted by physical appearance alone.

Control Valve Maintenance

• Check for persistent air leakage
• Inspect fittings and threaded connections
• Check that unloading occurs at the intended pressure
• Confirm the compressor returns to load correctly
• Inspect accelerator or actuator connections where fitted
• Replace worn valve service components as required

Need Help Identifying a Genie Control Valve?

• Existing valve reference
• Compressor manufacturer and model
• Engine type
• Receiver operating pressure
• Connection size
• Photographs of the existing valve and pipework arrangement