What is the purpose of a siphon on a steam pressure gauge?

The purpose of a siphon on a steam pressure gauge is primarily to protect the gauge from high steam pressure. When steam is directed into the gauge, the siphon acts as a barrier between the high-temperature steam and the sensitive components of the gauge. The design of the siphon allows water to collect inside it, which condenses steam and cools it down before it reaches the gauge. This ensures that the gauge operates accurately and is not damaged by the high temperature and pressure of the steam. By maintaining a safe operational environment within the gauge, the siphon prolongs its lifespan and enhances the reliability of pressure readings.