29
Table 2 Recommended tightening torques for main valve seat
Size of valve Width across flats Tightening torques
DN15 and DN15 LC 30 mm A / F (External) 110 - 120 N m
DN20 36 mm A / F (External) 140 - 150 N m
DN25 19 mm A / F (Inside) 230 - 250 N m
DN32 24 mm A / F (Inside) 300 - 330 N m
DN40 30 mm A / F (Inside) 450 - 490 N m
DN50 41 mm A / F (Inside) 620 - 680 N m
45. Refit the pushrod assembly.
46. Refit the main valve head, make sure valve locates on seat.
47. Check the valve lift shown in Table 3 using a depth gauge and adjust if necessary by
screwing the pushrod in or out of the diaphragm plate.
Table 3
Size of valve Valve lift
DN15LC 2.5 mm
DN15 2.5 mm
DN20 2.5 mm
DN25 3.0 mm
DN32 3.5 mm
DN40 4.5 mm
DN50 5.0 mm
47
45
Depth gauge
46
47
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