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Spiral and Helical Bourdon Tubes
Pressure Switches

Fluid Power - Intro to Hydraulics, Pneumatics, and how it all works
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Figure 8-6.—Simple bellows gauge. devices have the pressure applied to the outside of  the  bellows  (fig.  8-6). Simple Bellows Elements Bellows  elastic  elements  are  made  of  brass, phosphor    bronze,    stainless   steel,   beryllium- copper, or other metal suitable for the intended service   of   the   gauge.   Motion   of   the   element (bellows) is transmitted by suitable linkage and gears to a dial pointer. Most bellows gauges are spring-loaded—that  is,  a  spring  opposes  the bellows and thus prevents full expansion of the bellows. Limiting the expansion of the bellows in this  way  protects  the  bellows  and  prolongs  its  life. Because of the elasticity in both the bellows and the  spring  in  a  spring-loaded  bellows  element,  the relationship  between  the  applied  pressure  and bellows  movement  is  linear. Dual Bellows Indicators Another type of bellows element is the dual- bellows element. Figure 8-7 is a schematic diagram of this indicator. Dual-bellows element pressure indicators are used throughout the Navy as flow- measuring,  level-indicating,  or  pressure-indicating devices. Figure  8-7.–Differential  pressure  sensor  dual  bellows. 8-4







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