24
40. Replace the diaphragm plate and
pushrod assembly and loosely fit the
lower diaphragm chamber on the two
bolts either side of the union connection
to locate the spigot in the recess.
41. 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 to
replace the diaphragms in their original
order.
42. Push the lower diaphragm chamber
home to locate in the recess and refit
the M12 nuts and bolts.
Progressively and evenly tighten to a
torque of 80 - 100 N m (59 - 74 lbf ft).
43. Retighten the long union nut to ensure
a steam tight seal.
Bring the valve back into commission by
following as many Steps as are necessary
in Section 4, page 16.
To service or renew the main
valve and seat
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.
44. Unscrew the unions and release the
pipework.
45. Unscrew the spring housing nuts.
46. DP17, DP17E, DP17G, DP17Y and
DP27G
Remove the pilot valve housing,
complete with the spring housing
assembly.
41
40
42
43
45
44
44
46
DP27G shown
47
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