Description
The Xylem-McDonnell & Miller 310442 Ba-551-05, also known as a bellows assembly, is an essential component of certain HVAC equipment, particularly 551S controls. It functions as a flexible chamber, expanding and contracting in response to pressure changes. This movement results in the opening and closing of a valve, which regulates water flow throughout the system. This bellows assembly is critical for maintaining proper water levels and pressure in hydronic heating systems, which use hot water to generate heat. The bellows assembly helps to ensure accurate water control, which contributes to the heating system’s efficiency and reliability. In this case, the bellows assembly connects the float in a liquid-level control with the valve mechanism.
