Air Brake Manual


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Safety valve

The supply reservoir is protected from being over-pressurized and bursting by a safety valve (Fig.17). This valve is pre-set (usually at 150 psi [1,034 kPa]) and will blow off excess pressure. Once pressure is lowered, the safety valve will re-seal until an over-pressurized condition exists again. If a safety valve blows off excess pressure, this indicates a problem with the governor. The problem should be dealt with immediately by a qualified person.

Safety valves
Figure 17. Safety valves

Disclaimer

Rev: 2018