Pressure Gauge Parts

In this article we will learn about Pressure gauge parts. pressure gauge is a device that measure the pressure . it come in different type and size according to demand of  pressure measurement.


The case holds all the moving parts of the pressure gauge in one place and prevents damage to the components. Cases can be made from a variety of materials depending on the demands of the application. For industrial applications, cases may need to be made of a more rigid material, such as polypropylene or stainless steel, while commercial applications may require only steel or aluminum cases.


Bourdon tube

The Borden tube is one of the most important parts of a pressure gauge, as it is the means by which a gauge can detect pressure. Also known as the sensing element, the Borden tube flexes when it is subjected to pressure. The resulting motion is then transmitted to the pointer. The material that makes up a Borden tube depends on the pressure medium it receives. A bronze or brass Bourdon tube is satisfactory for pressure gauges receiving air, gas, steam, water and other non-corrosive media. For pressure gauges designed to handle corrosive media or media that may freeze or form solids easily, a diaphragm seal is included to protect the Borden tube.

bourdon tube



As its name suggests, the linkage of Borden tube connects the tube to the gear mechanism. As the Borden tube flexes upon application of pressure, the linkage transmits the motion of the Borden tube to the gear mechanism to activate the gear.


Gear mechanism

The gear mechanism is the recipient of movement from the Borden tube and linkage, and is the part that controls the movement of the pointer. Each gear in the pressure gauge gear mechanism is precision-built to move the pointer accurately. The ANSI accuracy rating required for a particular pressure gauge ultimately determines how the gear mechanism is designed. More complicated gear mechanisms are needed for pressure gauges that read pressure in smaller increments.


Pointer, Dial Face, Window and Ring

The pointer is the visible part of the pressure gauge that you see moving when you measure pressure. It “reads” the measurement as it points to a value upgrade or increment on the dial face. This part is directly connected and controlled by a gear mechanism to indicate pressure within the ANSI accuracy rating of the gauge. The dial face holds various pressure measurements. Dial faces can have kilogram force per square centimeter format, pound force per square inch, standard atmosphere, torr (mmHg) and other units of pressure. The window is made of clear plastic or glass. It acts as a protection for the pointer and dial face, and it provides a means by which you can view the pressure readings.

pointer of pressure gauge

Hair spring

Hair spring is a part of gear assembly. It is very thin and in spiral shape. Hair spring is connected to pinion and play role to remove pointer play.

hair spring


Socket is important part of a pressure gauge. It is a part in which pressure entered and will be measured. Socket comes in different – different size and standard according to demand.


Read Also

Pressure Sensing elements 

Pressure Gauge working principle