12317 Differential protection valve

Purpose The differential protection valve prevents both service brakes and secondary brakes applying their full braking force at any one time. The valve is designed to supply secondary line pressure to the spring brake release chambers when the service brakes are operating or to allow the service line pressure supplying the service brake chambers to decrease as the spring brakes are applied. By these means the spring and diaphragm actuator forces are prevented from compounding and overloading the combined spring and diaphragm actuator units and the foundation brakes which absorb the braking loads.

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