Relief valves open when the pressure behind them exceeds the set figure and close again once it drops, so the circuit cannot be over-pressurised if a regulator fails.

This category lists 7 Büyükdemir references cross-referenced against 22 original equipment numbers. The cross-reference tables cover Knorr-Bremse, Mercedes-Benz, Volvo, Renault, Scania and DAF parts.

Most looked-up references in this group: Relief Valve 4-4820, Relief Valve 1-1147, Relief Valve 4-4821, Relief Valve 1-1149, Relief Valve 4-4822.

Manufactured by Büyükdemir Otomotiv in Istanbul, a producer of truck and trailer air system parts since 1957.

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Relief Valve 1-1057

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Relief Valve 1-1147

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Relief Valve 1-1149

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Relief Valve 4-4820

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Relief Valve 4-4821

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Relief Valve 4-4822

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Relief Valve, Complete 1-1150