What function does a check valve perform in a water system?

A check valve is designed specifically to allow fluid to flow in one direction only. This function is crucial in many water systems to prevent backflow, which can cause contamination or other operational issues. By ensuring that water can only travel in the intended direction, the check valve helps maintain the integrity and efficiency of the water supply system.

While the control of pressure within the system, throttling the flow rate, and preventing contamination are important functions in a water system, these are not the primary responsibilities of a check valve. Other components, such as pressure relief valves and flow control valves, are meant for regulating pressure and flow rates, while different types of valves or backflow prevention devices specifically address the issue of contamination.