A resuscitator includes a flow control unit (5). The unit includes: (a) a peak inspirational pressure valve and controller (“PIP valve”) for controlling the pressure of gas delivered to the lungs of a patient, such as an infant, during inhalation so that the pressure does not exceed a selected PIP pressure, (b) a positive end-expiratory pressure valve and flow controller (“PEEP valve”) for allowing gas flow from the lungs through the PEEP valve during exhalation when the pressure in the lungs is above a selected PEEP pressure, and (c) a blow-off pressure relief valve that opens automatically if the gas pressure being delivered to the lungs exceeds a selected safe operation blow-off pressure that is higher than the selected PIP pressure.
