Plus and PSS Series - Lung Demand Valve
tm 1285.001 - August 2001
5:20
Refer to Figure 23.
6 Fully insert tailpiece through hole
in body of lung demand valve
and into hole in air transfer block
(3) then push and assemble a
new clip (2) over the end fitting
of hose - retaining the hose in
position. Whilst keeping the end
fitting of the hose fully inserted -
slide the clip (2) away from the
air transfer block - insert a new
spacer (1) ensuring that the lugs
of the spacer locate around the
extended pin of the clip (2). See
Fig. 23. Pull on the hose to check
that it is secure.
1136
1
2
3
Fig. 23
1223
Fig. 24
Important Note: If a replacement balanced piston unit has been fitted to an existing
Air Transfer Block, or a replacement Air Transfer Block has been fitted to an
existing balanced piston unit then checking and possible re-adjustment of
the main lever height will be required. Check height setting as follows.
7 Type A and AE demand valves: - press the end of the main pivot lever
to release the positive pressure mechanism.
8 Position and hold the body of
the demand valve as shown in
Fig. 24 then insert the Height
Gauge as shown. Press down
carefully then release the main
lever ensuring it moves freely
between the gauge plate.
Check that when the main lever
is released that the two fingers
of the lever are positioned
between the two engraved
setting-lines on the face of the
gauge plate. If the lever is too
high or too low re-set as follows:
Insert the ball end setting tool
through the slot at the pivot end
of the main lever and insert end
of tool into the slot of the adjusting set screw in the secondary lever. Rotate
the set screw clockwise to increase height and anti-clockwise to reduce
height of the main lever. Following each adjustment remove the tool and
press down carefully then release the main lever and check that when the
main lever is released that the two fingers of the lever are positioned
between the two engraved setting-lines on the face of the gauge plate.
Re-adjust as necessary and when set remove the Height Gauge.
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