Pressure switches are actuated by what mechanism?

Pressure switches operate primarily through the use of bellow diaphragms or bourdon tubes. These mechanisms are sensitive to changes in pressure and are designed to flex or move in response to varying pressure levels.

When the pressure in the system reaches a predetermined threshold, the bellow diaphragm or bourdon tube will actuate a switch mechanism. This actuation can either open or close an electrical circuit, indicating that a certain pressure condition has been met or exceeded. This function is crucial for safety and control in various industrial processes, as it enables automatic responses to pressure fluctuations, ensuring system integrity and preventing potential failures or hazards.

The other options suggest elements related to adjustment or configurations, but they do not directly address the fundamental mechanism that causes the pressure switch to operate.