Which component performs the loading function in a gas regulator?

The spring plays a crucial role in the loading function of a gas regulator. It provides the necessary force to balance the pressure of the gas within the regulator against the pressure applied downstream. When gas enters the regulator, it pushes the diaphragm, which in turn compresses the spring. This interaction ensures that the outlet pressure remains stable and is regulated according to the set point. The spring's tension influences how much pressure is allowed to pass through, enabling precise control over the gas flow to the intended application.

The other components, while essential to the overall functionality of the regulator, do not perform the loading function. The valve seat is primarily responsible for sealing off the gas flow when the regulator is not in use. The pressure gauge provides a visual representation of the pressure levels but does not actively influence the pressure regulation. The regulator body houses all these components and facilitates the gas flow path, but it does not directly engage in the loading function like the spring does.