What is the typical design of a bourdon tube found in a pressure gauge?

The typical design of a bourdon tube used in pressure gauges is the C-shape. This design is advantageous because it allows the tube to be easily compressed or expanded when pressure is applied. As the internal pressure changes, the curvature of the C-shape enhances the sensitivity and accuracy of the gauge by converting the pressure change into a measurable deflection. The more the tube tends to straighten under higher pressure increases, the greater the movement can be translated into a readable measurement on the gauge dial.

The other designs, such as the straight tube, spiral shape, and S-shape, are less common in bourdon tube applications. Though they may function in some contexts, the C-shape is specifically favored for its effective balance between size, sensitivity, and durability in pressure measurement, making it the standard in most pressure gauges.