What is the function of a check valve?

The primary function of a check valve is to allow flow in one direction only. This is crucial in preventing backflow, which can lead to contamination of the water supply or damage to the system. Check valves are designed to automatically close if the flow attempts to reverse, which ensures that water or other fluids cannot flow backward through the piping system. This one-way operation is essential in various applications, including sprinkler systems, where it helps maintain proper pressure and prevent the mixing of clean and contaminated water, thus ensuring the system operates effectively and safely.