What is the purpose of the copper tube in the thermal expansion feedwater regulator?

The purpose of the copper tube in the thermal expansion feedwater regulator is to connect the outer tube to the bellows. This is crucial for the operation of the feedwater regulator because it allows for the transfer of thermal expansion or contraction effects. The bellows are designed to respond to changes in temperature and pressure, and the copper tube acts as a conduit for these changes, facilitating the necessary movement or adjustments in the regulating mechanism.

This connection ultimately helps ensure that the regulator responds accurately to varying feedwater temperatures, maintaining the proper boiler water level and ensuring efficient boiler operation. Without this connection, the system could not effectively manage the feedwater flow in response to thermal expansion, leading to inefficient boiler performance.