Spirax Sarco DP17 - Page 26

IM-P100-05 CTLS Issue 17
26
Table 2 Recommended tightening torques for the main seat
Size of valve Width across flats Tightening torques
½" and ½" LC
DN15 and DN15LC
30 mm A/F (External) 110 - 120 N m (81 - 89 lbf ft)
¾" and DN20 36 mm A/F (External) 140 - 150 N m (103 - 111 lbf ft)
1" and DN25 19 mm A/F (Inside) 230 - 250 N m (170 - 184 lbf ft)
DN32 24 mm A/F (Inside) 300 - 330 N m (221 - 243 lbf ft)
DN40 30 mm A/F (Inside) 450 - 490 N m (332 - 361 lbf ft)
DN50 41 mm A/F (Inside) 620 - 680 N m (456 - 502 lbf ft)
54. Refit the pushrod assembly.
55. Refit the main valve head, making sure that the valve locates on the seat.
56. Check the valve lift shown in Table 3 using a depth gauge.
Table 3
Size of valve Valve lift
DN15LC and ½" LC 2.5 mm (0.098")
DN15 and ½" 2.5 mm (0.098")
DN20 and ¾" 2.5 mm (0.098")
DN25 and 1" 3.0 mm (0.118")
DN32 3.5 mm (0.138 ")
DN40 4.5 mm (0.177 ")
DN50 5.0 mm (0.197 ")
Adjust if necessary by screwing the pushrod
in or out of the diaphragm plate.
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Depth gauge
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