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A set peak inspiratory pressure (PIP) is applied, and the pressure difference between the ventilator and the lungs results in inflation until the peak pressure is attained and passive exhalation follows. The delivered volume with each respiration is dependent on the pulmonary and thoracic compliance.
The pressure regulator  or reducing valve  fits the yoke of the oxygen tank. It reduces the pressure of oxygen flow from 2,000 psi to levels of 40-70 psi, a safe delivery for patients. Positive pressure devices, or demand valve resuscitators, deliver approximately 60 liters of oxygen per minute in short bursts.