Plus and PSS Series - Lung Demand Valve
tm 1285.001 - August 2001
5:15
5.8 Air Transfer Block and Balanced Piston Assembly
Important Note: The Air Transfer Block and Balanced Piston Assembly is a precision
pre-set unit that incorporates a factory set Air Transfer Block Assembly
containing a pre-set and sealed balanced piston unit. These items have
unlimited service life.
The Dräger guarantee is void should any attempt be made by customers to
make adjustment to the balanced piston unit or the associated Injector Pipe.
Following the fitting of a replacement balanced piston unit to an Air
Transfer Block, or the fitting of a replacement Air Transfer Block to an
existing balanced piston unit will require re-adjustment of the main lever
setting height.
5.8.1 Removing Air Transfer Block and Balanced Piston Assembly
Tools required
Plate Spanner R26817
Retractor Tool 3310663
No. 2 Posi-Drive Screwdriver 3331245
Ball End Setting Tool (1.5mm) 3310676
AE and N
Assembly Tool 3310664
Connector Tool 3310679
1 If required disconnect demand valve from female quick release coupling
of equipment.
Refer to Figure 14.
2 Fold rubber cover (1) from front
of lung demand valve. Using
plate spanner inserted into
radial slots of bayonet cap, turn
bayonet cap (2) counter-
clockwise and remove from
body of demand valve.
Note:
Types A and AE - the positive
pressure spring remains attached
to the bayonet cap.
Do Not
remove spring. Take care not to
stretch or distort the spring.
0584
2
3
4
Fig. 14
1
3 Using the thumb and forefinger carefully grip the centre plate of the
diaphragm (3), tilt centre plate and lift the diaphragm from the body of
the lung demand valve. Remove slip ring (4).
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