What is the main function of check valves in pumping systems?

The main function of check valves in pumping systems is to regulate flow direction. Check valves are designed to allow fluid to flow in only one direction, preventing backflow that can cause damage to the pump or system components. By ensuring that the fluid moves in the desired direction, check valves help maintain system integrity and efficiency. This is particularly important in pumping applications where reverse flow could lead to contamination, equipment damage, or operational failures.

The other options do not accurately describe the function of check valves. Increasing pressure is typically managed by pumps or pressure regulators, measuring liquid levels is the role of level sensors or gauges, and stabilizing flow rates is more related to flow control valves or variable frequency drives that adjust pump speeds. Thus, the sole function of check valves is fundamentally about flow direction, which is why the selected answer is correct.