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Instructions for Use: GEV019-100
Page 12
Process Flow Diagram:
R1 = Oxygen regulator 1, controls the pressure of the GeVentor Expiration Valve (GEV) which maintains pressure in the patient
circuit above PEEP pressure.
R2 = Oxygen supply regulator 2, controls Inspiration pressure to the FiO
2
mixing valve. Ensures oxygen pressure is maintained at
350 kPa for equal mixing of the gas.
R3 = Air supply regulator 3, controls Inspiration pressure to the FiO
2
mixing valve. Ensures air pressure is maintained at 350 kPa
for equal mixing of the gas.
R4 = Mixed gas pressure control to the 2 mm orifice to achieve flow (minute flow) control of the inspiration cycle.
V1 = Open/closed control of gas flow/pressure to the GEV.
V2 = open/closed control to the inspiration gas flow through to the built-in 2 mm orifice feeding the manifold
V3 = FiO
2
mixing valve takes 350 kPa pressure from R2 and R3 and mixes it to any desired ratio from 21% oxygen (100% air) up to
100% oxygen
V4/V5 =
Non return valves ensure no mixing of gases can occur in the system and no contamination can occur in the hospital
gas delivery system. Without these valves, backflow occurs in the regulators and it is not possible to set them up to
equal pressures.
V6 = Pressure relief valve (PRV) for main emergency pressure relief. Controls over-pressure from being generated at the
inspiration source.
PT1 = Pressure transducer on the GeVentor for feedback to control system to ensure proper valve operation.
PT2 = Pressure transducer for flow control of the inspiration phase. Pressure from this transmitter X time = inspiration Vti. Feedback
for system pressure and flow rate control valve setting.
PT3 = Gauge pressure for the manifold/ patient circuit pressure control.
PT4 = Differential pressure for the secondary measurement of flow through the manifold.
PT5 = Differential pressure for the measurement of expiratory flow through the expiratory hos
e’s pneumotachograph
.