What common device is used to suppress boiler fluctuations and maintain pressure?

A pressure control valve is essential for maintaining stable pressure within a boiler system. This device functions by modulating the flow of steam or water in response to real-time pressure changes. When the pressure exceeds a predefined setpoint, the pressure control valve automatically adjusts to allow steam or water to escape or enter the system, thereby equalizing pressure fluctuations. This ensures consistent and optimal operation of the boiler, which is critical for safety and efficiency.

In contrast, other options serve different purposes: a pressure relief valve is primarily a safety device designed to prevent overpressure situations by releasing pressure but does not actively control pressure fluctuations. A blowoff valve is used to remove sediment and scale, and a feedwater pump is responsible for supplying water to the boiler, both of which do not directly regulate or stabilize pressure within the system. Thus, the pressure control valve plays a direct role in managing boiler pressure fluctuations effectively.