Many processes in the modern world involve the measurement and control of pressurized liquid and gas systems. This monitoring reflects certain performance standards, which must be controlled to produce the desired process results and ensure its safe operation. Boilers, oil refineries, water systems, and compressed gas systems are just a few of the many applications of pressure gauges.

　　Glycerine-filled pressure gauge or pressure gauge consists of an elastic pressure element. The threaded connection method is called "socket"; a sector gear mechanism called "motion"; and the protective cover, dial, and sight glass assembly. An elastic pressure element is a member that actually shifts or moves due to the influence of pressure. If the design is reasonable, the pressure element is both accurate and repeatable. The pressure element is connected to a geared "movement" mechanism, which in turn rotates the pointer throughout the dial. What the viewer uses to determine that the pressure indicates the position of the pointer relative to the scale.

　　The most common pressure gauge design in the pressure gauge manufacturer was invented by French industrialist Eugene Bourdon in 1849. It uses a curved tube design as a pressure sensing element. Less common pressure element designs are diaphragm or disc shapes, which are especially sensitive at lower pressures. This article will focus on the Bourdon tube pressure gauge.

　　design

　　In the Bourdon gauge, the "C"-shaped hollow spring tube is closed and sealed at one end. The other end is tightly sealed and joined to the socket, threaded connection device. When a pressure medium (such as air, oil, or water) enters the pipe through the socket, the pressure difference from the inside to the outside will cause the pipe to move. This movement can be related to the unwinding of the hose when pressurized with water, or the blowing of whistleblowing into the air. The direction of this movement is determined by the curvature of the pipe, the inner radius is slightly shorter than the outer radius. A certain amount of pressure will cause the "C" shape to open or stretch a certain distance.