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A non-return valve, also known as a check valve, is a crucial component in heating systems that prevents backflow of water or gas. This part ensures that flow moves in only one direction, protecting pumps, boilers, and other equipment from damage caused by reverse flow. Whether used in a boiler feed line or a burner gas supply, a non-return valve enhances system safety and reliability. Replacing a faulty valve is a common repair task that can prevent costly system failures and maintain proper operation.