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In boiler design, a diagonal stay serves a critical structural function by providing additional support and stability to the boiler components. Specifically, it helps to stabilize right angle surfaces, which can be pivotal in maintaining the integrity of the boiler under pressure and operational stresses. The diagonal stay functions by distributing forces more evenly across the structure, which prevents distortion or failure of the boiler components over time.

The design of boilers often involves a variety of angled surfaces that need to remain sturdy and secure. If these surfaces are not adequately supported, they can buckle or warp under pressure, leading to potential safety hazards and decreased efficiency. Therefore, the presence of diagonal stays is essential for ensuring that the design can withstand the various forces it encounters during operation, thus enhancing the overall safety and functionality of the boiler system.