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A non-return valve, also known as a check valve, is used in heating and gas systems to allow flow in one direction only, preventing backflow that could cause contamination or damage. This component is essential for maintaining system integrity and safety, particularly in burner spare parts and boiler installations. It ensures that gases or liquids flow correctly through the system, protecting sensitive components like pumps and control boards. A reliable non-return valve is a must-have for any heating equipment maintenance or repair project.