23
32
35
34
33
To renew pilot valve diaphragms
DP17, DP17E, DP17G, DP27G and DP17Y
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.
32. DP17, DP17E, DP17G, DP17Y and DP27G
Unscrew the spring housing nuts and remove
the spring housing, bottom spring plate and old
diaphragms.
DP17R
Unscrew the securing nuts and remove the air
control block and old diaphragms.
33. Ensure that all contact faces are cleaned. New
diaphragms should be fitted such that the
precoated sealant (which is only applied to one
diaphragm) faces down contacting the sealing
face of the diaphragm chamber.
34. DP17, DP17E, DP17G, DP17Y and DP27G
Replace the bottom spring plate.
35. DP17, DP17E, DP17G, DP17Y and DP27G
Assemble the spring housing and tighten the
nuts to the recomended torque shown in Table
1, page 21.
DP17R
Assemble the air control block and tighten the
nuts to the recommended torques shown in
Table 1, page 21.
Bring the valve back into commission by following
as many Steps as are necessary in Section 4,
page 16.
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