The working principle of the pressure gauge is to use an elastic sensitive element (such as a spring tube) to generate elastic deformation under the action of pressure. The size of the deformation amount has a certain linear relationship with the applied pressure. Indicates the measured pressure. According to different elastic sensitive components, pressure gauges can be divided into: spring tube type, diaphragm type, diaphragm type and bellows type.

The pressure gauge is an elastic pressure instrument, and its structural principle: the elastic pressure gauge consists of a measuring system (including joints, elastic elements and transmission mechanisms, etc.), an indicating part (including pointer and dial) and a shell part (including watch case, cover ring) and watch glass, etc.), the instrument has good sealing and is equipped with a sealing device, which can protect its internal measuring mechanism from mechanical damage and contamination. The principle of action of elastic pressure gauges is based on the deformation of the elastic element (the spring tube in the measuring system). Under the pressure of the measured medium, the elastic element is forced to deform (for example, the end of the spring tube produces corresponding elastic deformation)-displacement, and it will be fixed on the gear shaft by means of the rotation of the connecting rod through the gear rotating mechanism and pre-amplified The pointer gradually indicates the measured pressure on the dial.

According to different elastic sensitive components, pressure gauges can be divided into: bourdon tube type, diaphragm type, diaphragm type and bellows type. Most of the ones we usually see are bourdon tube types.