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The by-pass non-return valve serves the same function as other check valves in a heating system, allowing flow in one direction and blocking reverse flow in a by-pass loop. This particular valve is a spare part for boiler and burner systems, helping to maintain correct hydraulic balance and protect components from backpressure. When you need to replace a worn or stuck valve, this by-pass non-return valve ensures smooth operation and prevents system inefficiencies. It is a practical choice for routine maintenance or repair.