What is the primary function of check valves in fire protection systems?

The primary function of check valves in fire protection systems is to prevent backflow. These devices are designed to allow fluid (such as water or fire suppressants) to flow in only one direction. In the context of fire protection, preventing backflow is crucial because it ensures that the water supply does not reverse its flow, which could lead to contamination of the potable water supply or interfere with the operation of the fire suppression system.

Check valves are particularly important in maintaining the integrity and reliability of fire protection systems. When a sprinkler system is activated, for instance, the effective flow of water to each sprinkler head must be ensured without the risk of water flowing back into the source supply. This function is critical in ensuring that fire protection systems operate effectively when needed, allowing them to function as intended during emergencies. The design and operation of check valves are tailored to ensure that they respond appropriately under varying pressure conditions without failing to prevent backflow.