Define the operation of the valves of a refrigeration compressor:

The operation of the valves in a refrigeration compressor is primarily based on pressure differences within the system. As the compressor performs its function of compressing refrigerant gas, the pressure varies significantly between the low-pressure side (suction) and the high-pressure side (discharge).

When the pressure in the suction side drops below a certain threshold due to the low-pressure refrigerant gas entering the compressor, this creates a condition that allows the suction valve to open. Conversely, as the refrigerant is compressed and the pressure on the discharge side increases, the discharge valve is actuated to open when the pressure reaches a level sufficient to overcome the force of the spring or other mechanisms keeping the valve closed. Thus, the compressor's valves automatically respond to these pressure changes, allowing for the efficient flow of refrigerant through the system.

In terms of system efficiency and operation, relying on pressure differences rather than electronic means or manual operation enables the compressor to respond flexibly and dynamically to varying load conditions and demands, ensuring that the refrigeration cycle operates effectively.