What is the primary purpose of a pressure regulator in oxygen therapy?

The primary purpose of a pressure regulator in oxygen therapy is to ensure safe oxygen delivery pressure. In oxygen therapy, it is vital that the oxygen flow remains constant and at a pressure that is safe for the patient. If the pressure is too high, it can lead to discomfort or even injury. By regulating the pressure, the device allows for a controlled flow of oxygen, ensuring that the delivery to the patient meets their therapeutic requirements without the risk of over-pressurization. The pressure regulator manages the high pressure from the oxygen cylinder and reduces it to a manageable level suitable for therapeutic use.

The other options do serve important functions in different contexts related to oxygen therapy but do not describe the main role of a pressure regulator. For example, filtering impurities is generally the function of a specific filtration system, gauging oxygen levels relates to monitoring equipment, and sealing the oxygen cylinder refers to the valve system rather than the regulation of pressure flow.