What is the primary purpose of a check valve in a piping system?

The primary purpose of a check valve in a piping system is to allow flow in one direction while preventing reverse flow. This is crucial for maintaining the efficiency and safety of various fluid systems, especially in irrigation and water management. By permitting flow only in the intended direction, check valves help to prevent backflow, which can lead to contamination of the water supply, system malfunctions, and inefficiencies.

For instance, in an irrigation system, if water were to flow back into the supply line, it could lead to a mixture of treated and untreated water, compromising the integrity of the potable water system. Additionally, preventing reverse flow helps maintain proper pressure and flow rate in the system, ensuring that the water reaches its intended destination effectively.

In contrast, options suggesting flow in both directions or regulating water temperature do not align with the function of a check valve, as they would defeat the purpose of controlling flow direction. Similarly, a check valve does not increase water pressure; rather, its role is focused solely on flow control.