Why is it essential that there be no valve between the safety valve and the boiler?

It is crucial that there be no valve between the safety valve and the boiler to ensure safety functionality. The primary role of a safety valve is to automatically release excess pressure from the boiler to prevent dangerous situations, such as an explosion or a catastrophic failure. If a valve were installed between the safety valve and the boiler, it could be inadvertently closed during operation, preventing the safety valve from functioning properly. This situation could lead to the buildup of pressure within the boiler beyond safe limits, compromising the safety of the entire system. By ensuring a direct and unobstructed path from the boiler to the safety valve, the system can operate safely and respond appropriately to any overpressure conditions.