Spirax Sarco DP27 - Recommended Tightening Torques for Main Valve Seat

IM-P470-03 CH Issue 7
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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
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Depth gauge
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