The Bourdon Tube in a steam pressure gauge is protected by a ________________ .

The Bourdon Tube in a steam pressure gauge is protected by a syphon because the syphon serves to prevent high-temperature steam from directly contacting the gauge itself. When steam enters the gauge, it can reach temperatures that might damage the gauge's internal components, particularly the Bourdon Tube, which is sensitive to heat.

The syphon typically consists of a U-shaped pipe filled with a liquid, often water, which absorbs the heat of the steam before it reaches the gauge. This action not only protects the mechanism but also ensures more accurate readings, as the temperature of the steam could otherwise lead to erroneous pressure readings.

The use of a syphon is essential in maintaining the longevity and functionality of pressure gauges in applications involving high-temperature steam. It is a well-established practice in piping systems to ensure that any measuring instruments remain operational and accurate under challenging conditions.