Titanium bellows manufacturers believe that the bellows are foldable bellows along the folding and stretching direction of the connection of the tube-like elastic sensor. Bellows are widely used in instruments, its main purpose is to convert pressure into displacement or force, as a pressure measuring instrument measuring components. The corrugated tube has thin wall and high sensitivity, and the measuring range is from tens of PA to tens of MPA. The open end is fixed, the sealing end is in a free state, and the elasticity is increased by using an auxiliary spiral spring or spring. When working, under the action of internal pressure along the length of the pipeline stretch, so that the mobiles end has a certain relationship with the pressure displacement. The active end drives the pointer to indicate the pressure directly. Bellows are often combined with displacement sensors to form a pressure sensor that outputs electricity and is sometimes used as an isolation element. Because the expansion of bellows requires a larger volume change, the response speed of bellows is lower than that of Poteng tubes.