What is true regarding cylinder head bypass in multi-cylinder compressor systems?

In multi-cylinder compressor systems, the mechanism for managing the operation of active and inactive cylinders is crucial for maintaining efficiency and performance. The correct choice, which states that a check valve is used to separate inactive cylinders from active ones, highlights the role of this component in preventing backflow and ensuring that only the desired flow of refrigerant enters the active cylinders.

The check valve allows refrigerant to flow in one direction, ensuring that the inactive cylinders are isolated from the system's active operation. This allows the system to adjust its capacity according to the load demands efficiently, maximizing energy efficiency and preventing potential issues that could arise from mixing pressure or flow among different cylinders.

Other choices do not accurately describe the mechanism of cylinder head bypass. For instance, a valve separating active from inactive cylinders is more broadly associated with different compressor configurations, rather than specifying the function of a check valve. A filter's role is related to ensuring clean refrigerant flow, particularly to avoid liquid refrigerant entering components that require gaseous refrigerant, but this does not correlate with bypassing or managing cylinder operation. Finally, while a controller can regulate temperature in a broader system context, it does not specifically manage the direct separation of active and inactive cylinders, which is the key function of the check valve