What key components should be present on a pressure control?

The correct choice highlights the essential functionality of a pressure control system, which consists of a cut-in and differential mechanism. The cut-in setting refers to the pressure level at which the control activates the boiler to start generating steam or heating, ensuring that there is adequate pressure for safe and efficient operation. The differential, on the other hand, defines the range between the cut-in and cut-out pressures. This range is crucial as it prevents the boiler from continuously cycling on and off, thereby maintaining stable system pressure and improving operational efficiency.

The presence of both cut-in and differential settings ensures that the boiler operates within safe limits. This control not only protects the equipment from pressure-related failures but also enhances efficiency by avoiding unnecessary fuel consumption. Understanding these components is vital for effective pressure control management in high-pressure boiler systems, making this option the most comprehensive and appropriate selection.