19
To renew or change the control spring
It is not necessary to isolate the valve in order to change
the spring.
1. Release the lock-nut.
2. Turn the adjustment screw anticlockwise. Ensure there
is no compression on the pressure adjustment spring.
3. For the DP17 and derivatives only - Slide out the
'C-shape' washer.
4. Remove the cover.
5. For the DP17 - Remove the pressure adjustment spring
and top plate.
For the DP27G - Firstly undo the 4 off spring housing
securing nuts and remove the spring housing. Then
remove the pressure adjustment spring and the top
spring plate.
6. Reassemble in reverse order.
To renew the pilot valve assembly
DP17, DP17E, DP17G , DP17Y and DP27G
Isolate the pressure reducing valve and zero the pressure.
Follow Steps 1 to 5 then proceed.
DP17R
Isolate the actuating air supply and zero the pressure.
7. Unscrew the unions and release the pipework.
8. DP17, DP17E, DP17G and DP17Y
Unscrew the spring housing nuts and remove the spring
housing, bottom spring plate and diaphragms.
DP27G
Undo the 4 off spring housing securing nuts and
remove the spring housing. Then removethe pressure
adjustment spring, top spring plate, bottom spring plate
and diaphragms.
DP17R
Unscrew the securing nuts and remove the air control
block and diaphragms.
DP17
DP27G
DP17
2
1
3
5
4
8
7
7
1
4
5
7
7
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