Control valves
The mentioned proportional valves regulate the gas flow to the patient. The flow control is
able to send flows up to 180 L/min when the gases are from a central-supply system, and of
120 L/min when a portable compressor provides the air.
Two solenoids valves govern the expiratory valve, one for the closing and opening
(beginning and end of the inspiratory phase). The other one is a low flow proportional valve
that regulates the partial closing of the expiratory valve to produce positive pressure at the
end of the expiration (PEEP). The activity of these valves is coordinated by the
microprocessor, synchronizing its actions.
The system of valves has, also, four solenoids valves that act synchronously every 15
minutes to make a system zeroing (atmospheric pressure) of all sensors. At the same time,
another solenoid valve allows to pass a calibrated compressed air flow to purge the lines of
the expiratory pneumotachograph to avoid the entrance of water and humidity to the sensors.
Control panel
The control panel comprises the keys to select the different modes and functions. In the
center there is a LCD screen where the results appear, so much in numeric data as graphic
representations and messages.
Some keys have lamps to indicate activation of the required function. The graphics in real
time of pressure, flow, volume, pressure/volume and flow/volume loops appear in successive
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