Plus and PSS Series - Lung Demand Valve
tm 1285.001 - August 2001
5:7
1
2
3
4
5
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Fig. 3
0584
6
5.4 Replacing Diaphragm
Tools Required
Plate Spanner
R26817
Refer to Figure 3 - Type A Demand Valve Illustrated.
1 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.
2 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).
Discard defective diaphragm.
3 Carefully locate outer bead of new diaphragm into groove in the body of
the demand valve. Locate tapered side of slip ring into recess in bead of
diaphragm.
Types A and AE - Locate positive pressure spring of bayonet cap into the
recess in centre plate of diaphragm.
Using plate spanner, inserted into radial slots of the bayonet cap, lock
bayonet cap to body then fold rubber cover back over the front of the
demand valve.
4 Press re-set button of type A and AE demand valves. Connect demand
valve to equipment and carry out Leak Test and Functional Test.
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