High-pressure steam boilers must have one or more of what safety device?

High-pressure steam boilers must be equipped with a safety valve, which is crucial for preventing dangerous overpressure conditions within the boiler. The primary function of a safety valve is to automatically release excess steam when the pressure exceeds a predetermined limit, effectively protecting against potential explosions or mechanical failures that could result from excessive pressure buildup.

The safety valve is designed to open rapidly when a specific pressure threshold is reached, allowing steam to escape and thus reducing the pressure inside the boiler to a safe level. This device is a critical safety feature that ensures safe operation and compliance with regulations governing high-pressure steam systems.

While pressure relief valves and shut-off valves may also play vital roles in boiler operation and safety, the specific function of controlling excessive pressure is uniquely associated with safety valves. Flow control valves help manage the flow of fluids but do not address safety concerns related to pressure directly. Therefore, the requirement for a safety valve in high-pressure steam boilers is a fundamental component of boiler safety design and operation.