In diaphragm pressure gauges, the pressure is transmitted by using a wave-shaped diaphragm to a connection. This then transfers the pressure for the motion. In the event the mechanics of the Bourdon tube are pressurised, the cross-part is altered towards a round shape. The hoop stresses that are developed in http://daltonhhgdc.theideasblog.com/13775714/what-does-pressure-gauge-mean