What is the primary purpose of check valves in fire systems?

Check valves serve a crucial function in fire systems by allowing water to flow in one direction only. This unidirectional flow is essential for maintaining system integrity and functionality. In the context of fire protection, a check valve prevents the backflow of water, which could potentially compromise the system's pressurization and efficiency.

When water is pumped through the system, it must reach various components effectively to ensure optimal performance during a fire emergency. Should backflow occur, it could lead to a range of issues, including contamination of the supply line or insufficient pressure for fire suppression.

This design is pivotal in ensuring that water intended for fire suppression does not flow back into other areas of the water system. By maintaining the correct flow direction, check valves contribute to the reliability of fire sprinkler systems and other related equipment. Additionally, they help protect against potential damage caused by pressure fluctuations that backflow could create.

The other options do not accurately describe the function of check valves. They are not intended to increase flow, mix water types, or decrease water pressure, which further emphasizes the correctness of the chosen purpose.