Check Valve: A check valve is a mechanical device that allows fluid to flow in one direction while preventing backflow in the opposite direction. It operates automatically, relying on pressure differences across the valve to open or close without the need for external actuation. Check valves are essential components in piping systems to protect equipment, maintain pressure, and prevent contamination or damage caused by reverse flow. There are several types of check valves, including swing, lift,

Tennessee 3-Valve Double Check Valve Assembly Testing Procedures