Penlon AV-S, Service Manual, Page: 20 / 94

3.3 Pneumatic System
3.3.1 System Operation
Refer to the pneumatic system diagram on the
previous page.
A) Gas inlet manifold block
The AV-S Ventilator is designed to operate on a
310 - 689 kPa (45 -100 psi) drive gas supply
(oxygen or air - to customer’s requirement).
1. DISS Connector
The gas source is connected to the
DRIVE GAS SUPPLY fitting on the rear of
the ventilator control unit.
The gas supply should be capable of a
flow rate of 80 L/min while maintaining a
minimum pressure in excess of 310 kPa
(45 psi).
2. Filter
The drive gas is filtered with a 40-micron
Input Gas Filter which protects the
pneumatic components from incoming
particulate matter.
3. The Low Supply Pressure Detector
The pressure switch is set at a
predetermined level to detect a loss or
reduction of the input gas source
pressure.
When the pressure falls below 235 kPa
(35 psi ± 1 psi), the LOW SUPPLY
PRESSURE indicator will be displayed
and the high priority audible alarm will
activate.
4. Input Pressure Regulator
Regulates the input drive gas to 260 kPa
± 21 kPa (38 psi ± 3 psi).
5. Cut-off Valve
The valve isolates the the gas supply :
a) when the ventilator is switched off
b) when a fault condition occurs.
6. Airway Pressure Sensor
Connected to expiratory limb of breathing
circuit.
DESCRIPTION
14
B) Pneumatic Control Manifold Block
7. Inspiratory Proportional Valve
8.
Flow Sensor
9. Drive Gas pressure Sensor
10. Low Pressure Regulator
11. Expiratory Proportional Valve
12. PEEP pressure sensor
13. Restrictor
The restrictor allows a flow of up to 2 L/min
(<2 L/min bleeding)
C) Exhaust Manifold Block
14. Check Valve
15. Diaphragm Valve
16. Pressure Relief valve
Set to 100 cmH
2
O
17. Exhaust Port ( to AGSS)
18. Bellows drive gas outlet (to bellows
assembly)