30
48. Thoroughly clean the lower diaphragm chamber making sure contact faces are clean.
49. 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.
50. Refit the diaphragms in exactly the same way as when they were dismantled.
51. 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.
52. Retighten the long union nut to ensure a steam tight seal.
53. Refit the main valve head.
54. Replace the main valve return spring.
55. Fit a new gasket.
56. Replace the internal strainer screen.
57. DP27, DP27E and DP27Y
Assemble the pilot valve housing complete with spring housing assembly and tighten
the nuts to the recommended torques shown in Table 1, page 21.
DP27R
Assemble the pilot valve housing complete with air control block and tighten the
nuts to the recommended torques shown in Table 1, page 21.
58. Refit the pipework and retighten the unions to ensure a tight seal.
Bring the valve back into commission, following as many Steps as necessary in Section 4,
page 16.
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