The G-1 regulator is also known as what type of regulator?

The G-1 regulator is referred to as a pressure demand or demand valve regulator. This type of regulator is designed to supply breathing air to the wearer only when it is needed, responding to the user's inhalation effort. When the user inhales, a diaphragm in the regulator opens a valve that allows air to flow from the SCBA tank to the mask, ensuring that the air is delivered at the user’s inhalation rate.

This mechanism is essential for ensuring efficient use of the air supply, providing breathing air only during inhalation and maintaining a positive pressure in the mask to prevent contaminants from entering. The pressure demand feature allows for a more responsive and adequate supply of air under various physical exertion levels, enhancing safety and performance in environments where breathing air supply is critical.

The other types of regulators mentioned do not apply to the G-1. A constant flow regulator, for example, provides a fixed flow rate irrespective of demand, while a variable flow regulator would adjust based on predefined conditions rather than on user inhalation. An automatic pressure regulator maintains a constant pressure regardless of flow, which differs from the demand-driven function of the G-1's regulator.