What is the function of a multiple-circuit safety valve in an air brake system?

The function of a multiple-circuit safety valve in an air brake system is crucial for ensuring safe operation. Your selected combination covers the essential functions.

Firstly, sealing off a leaking circuit prevents the loss of air pressure in the other circuits. This is vital because if one circuit fails, the remaining circuits can continue to function, allowing for controlled braking.

Secondly, ensuring the supply of compressed air to intact circuits maintains braking performance even when one circuit experiences an issue. This redundancy is a significant safety feature, as it helps prevent total brake failure.

However, it is also important to consider the third option, which is to protect all circuits from excessive pressure. This feature helps prevent damage to the braking system, which could lead to malfunctions or failures.

In summary, while your selection included key functions of the multiple-circuit safety valve, understanding the importance of comprehensive protection measures in the system, including pressure regulation, is crucial according to German traffic laws and regulations aimed at ensuring vehicle safety.