27
57. Thoroughly clean the lower diaphragm
chamber making sure that the contact
faces are clean.
58. Replace the diaphragm plate and
pushrod assembly and loosely fit the
lower diaphragm chamber on to the two
bolts either side of the union connection
to locate the spigot in the recess.
59. Refit the diaphragms in exactly the same
way as when dismantled.
60. 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 75 N m.
61. Retighten the long union nut to ensure
a steam tight seal.
62. Refit the main valve head.
63. Replace the main valve return spring.
64. Fit a new gasket.
65. Replace the screen.
66. DP17, DP17E, DP17G, DP17Y and
DP27G
Assemble the pilot valve housing
complete with the spring housing
assembly and tighten the nuts to the
recommended torques shown in Table
1, page 21.
DP17R
Assemble the pilot valve housing
complete with the air control block and
tighten the nuts to the recommended
torques shown in Table 1, page 21.
67. Refit the pipework and retighten the
unions to ensure a tight seal.
Bring the valve back into commission by
following as many Steps as necessary in
Section 4, page 16.
63
64
60
61
67
67
66
62
DP27G shown
64
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