Mindray WATO EX-55Pro, Service Manual

Page: 78 / 474

2-64
2.2.10 Drive Pressure - High Pressure Regulator (200 kPa, 29
psi)
The drive pressure regulator stabilizes the supply pressure upon the proportional valve.
The flow generated by the proportional valve is therefore independent of pressure variations at the
supply.
Setting the drive pressure regulator at 200 kPa (29 psi) allows for a maximum of inspiratory flow
of 110 L/min at the ventilator.
2.2.11 Drive Gas Assembly
The drive gas assembly comprises the inspiratory circuit and PEEP circuit. The gas flow of the
inspiratory circuit goes through the inspiratory valve, which generates a gas flow of 0 to 110
L/min. The gas flow of the PEEP circuit goes through the PEEP valve, which also generates gas
pressure of 3 to 30 cm H2O. Both the PEEP and inspiratory valves are proportional solenoid
valves controlled by the valve drive board.
2.2.12 Negative Pressure Suction System
This negative pressure suction system is a Venturi negative pressure suction system. Negative
pressure is produced by the Venturi pipe in the negative pressure generator drive d by Air. The
negative pressure value is displayed and adjusted as needed by the negative pressure control pamel
assembly. Drive gas goes through the negative pressure generator, and then is discharged from the
muffler assembly to the air. Negative pressure control pamel realizes the on-off controlling and
adjusting of the negative pressure source.
Negative pressure
generator
Muffler
Drive gas
inlet
Negative pressure
outlet
Negative
pressure
selecting
knob
Negative
pressure
adjusting knob
Negative
pressure gauge