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15 Annex
15.1 Tightening torques
Note concerning the following specifications:
− All tightening torques specified in Nm
− Tightening torque tolerance: ±10 %
− The tightening torques are based on a friction coefficient of 0.06 with a lubricated seat
thread and facing.
− After long operating times or long periods or use at temperatures above 250 °C, the
breakaway torque may be twice as high as the tightening torque.
15.1.1 Tightening torques to install the seat
Valve size
DN
NPS
15 to 25
½ to 1
32 to 50 1½ to 2
65 to 80 2½ to 3
Torque multiplier with gear ratio 1:12.5
1)
Only use a torque wrench to tighten the seat; do not use an additional torque multiplier.
2)
15.1.2 Tightening torques for connection of body and bonnet
Valve size
DN
15 to 25
32 to 50
65 to 80
EB 8115 EN
Thread
Without torque multiplier
M32x1.5
M58x1.5
M90x1.5
NPS
½ to 1
1½ to 2
2½ to 3
Seats (2) made of 1.4404
160
480
900
Tightening torque for body nut (10)
30
50
100
With torque multiplier
–
2)
38
72
Annex
1)
15-1
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