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5.6 How to renew the pilot valve diaphragms
DP27, DP27E and DP27Y
Isolate the reducing valve and zero the pressure.
DP27R
Isolate the actuating air supply and zero the pressure.
23. DP27, DP27E and DP27Y
Unscrew the nuts and remove: spring housing, bottom spring plate and old diaphragms.
DP27R
Unscrew the nuts and remove the air control block and old diaphragms.
24. 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.
25. DP27, DP27E and DP27Y
Replace the bottom spring plate.
26. DP27, DP27E and DP27Y
Assemble the spring housing and tighten
the nuts to the recomended torque shown
in Table 1, page 19.
DP27R
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,
following as many Steps as necessary in
Section 4, page 16.
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