There are three basic operating components in most regulators: a loading mechanism, a sensing element, and a control element. These three components work together to accomplish pressure
The oxygen regulator is a gas pressure regulator. It is not a gas flow control regulator. It has three parts--the loading, sensing and control mechanisms.
Compressed gas regulators normally operate over a range of delivery pressures above and below 60 psig. Unheated regulators, operating at delivery pressures below 60 psig, are therefore subject to classic freeze up with solid CO2.