A lift-check valve is a type of check valve designed to control the flow of fluids in a pipeline. It features a disc, often referred to as a "lift," that can be raised from its seat when there is higher pressure on the inlet or upstream side of the valve. This lifting action allows fluid to flow through the valve and into the outlet or downstream side. Prominent manufacturers of lift-check valves include Spirax Sarco and Nibco. These valves are commonly employed in various industrial settings, including chemical processing plants, oil and gas pipelines, water treatment facilities, and HVAC systems, where the prevention of backflow is crucial to maintain the integrity and efficiency of the fluid systems.