Spirax Sarco DP27T Installation And Maintenance Instructions Manual page 26

5.7 How to renew or clean main diaphragms:
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Isolate the valve and zero the pressure.
Remove the sensor bulb and allow it to
cool, otherwise the control system may
be strained.
30. Undo the long union nut and pull away.
31. Undo the M12 nuts and bolts.
32. D r o p a w ay t h e l o we r d i a p h r a g m
c h a m b e r, t h e t w o d i a p h r a g m s ,
diaphragm plate and pushrod assembly.
33. Thoroughly clean the lower diaphragm
chamber making sure that the contact
faces are clean.
34. Replace the diaphragm plate and
pushrod assembly and loosely fit the
lower diaphragm chamber on two bolts
either side of the union connection to
locate the spigot in the recess.
35. Bring the two new diaphragms together
(where precoated sealant is applied
this should face outwards) and slide
into position.
If the diaphragms are not renewed, but
cleaned only care must be taken not to
turn diaphragms over.
36. Push the lower diaphragm chamber
home to locate in recess and refit the
M12 nuts and bolts. Progressively and
evenly tighten to a torque of 75 N m.
37. Retighten the long union nut to ensure
a steam tight seal.
Bring the valve back into commission by
following as many Steps as necessary in
Section 4.
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