A compressor system includes an inlet for receiving a fluid stream, a compressor in communication with the inlet, a separator in communication with the compressor, and a vent. The compressor system also includes a flow diversion control device in communication with the inlet, the compressor, the separator, and the vent, where the flow diversion control device has a first port in fluid communication with the separator, a second port in fluid communication with the inlet, a third port communicatively coupled with the inlet, a fourth port in fluid communication with the vent, and a mechanical valve having a first orientation configured to connect the first port to the second port and the third port to the fourth port for unloading the compressor system, and a second orientation configured to connect the first port to the third port and the second port to the fourth port for loading the compressor system.