Bourdon Pressure Gauge Parts

Bourdon Pressure Gauge Parts

The closed end of the bourdon tube is attached to a mechanical linkage. The linkage is connected to a pointer or other output device.


A Bourdon pressure gauge is a device that measures pressure by measuring the amount of flex in a curved tube, known as a Bourdon tube.

Bourdon Pressure Gauge Parts

The primary parts of a Bourdon pressure gauge are:

  1. Bourdon Tube: This is a curved, flexible tube that expands and contracts in response to changes in pressure. The tube is typically shaped like a C, but it can also be spiral or helical in design. The tube is usually made of brass, phosphor bronze, or stainless steel.

  2. Linkage Mechanism: This is a set of levers and gears that translate the movement of the Bourdon tube into rotation of a pointer. The mechanism is designed in such a way that a small movement in the Bourdon tube results in a much larger movement of the pointer.

  3. Dial and Pointer: The dial is the face of the pressure gauge, marked with numbers indicating the pressure. The pointer is a needle-like hand that moves around the dial, pointing at the current pressure reading.

  4. Pressure Connection: This is the part of the gauge that connects to the system whose pressure is being measured. It is often a threaded fitting that screws into a port on the system.

  5. Case: The case houses all the internal components of the pressure gauge, protecting them from damage and environmental conditions. It can be made of various materials including plastic, stainless steel, or aluminum. Some cases are filled with a damping fluid to protect the gauge from vibrations.

  6. Window: This is the transparent part of the gauge through which the dial and pointer can be viewed. It can be made of glass, plastic, or a more durable material such as safety glass or polycarbonate.

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