Yushu corrugated steel pipe culvert bridges and culverts corrugated metal pipe culvert @ Shaanxi town Germany factory wholesale 18709187805 bellows refers wrinkled piece foldable telescopic direction along the fold connected tubular elastic sensing element. It is fixed to the open end, the end seal in a free state, and the auxiliary coil spring or springs to increase flexibility. When working under the effect of the internal pressure of the elongation along the longitudinal direction of the tube, the movable end of a displacement of the pressure generated in a certain relationship. Events end led to a direct indication of the size of the pointer pressure. Often in combination with bellows together forming the output of the displacement sensor is a pressure sensor power is sometimes used as a spacer element. Since the corrugated tube requires a larger volume change stretch, so it is lower than the response speed of the Bourdon tube. Bellows suitable for measuring low pressure.