9.3 Resources for maintenance and repairs
9.3.1 Bolt torques
Unless otherwise stated, the following torques must be used. The specified values
apply to greased bolts.
Valve head screws must be tightened with a torque wrench. Self-locking nuts must
not be re-used, replace them.
Exception related to the following torques: Ensure that the fixing screws for the fi-
nal pressure safety valve (059410, M 8) are only tightened with 10 Nm (7 ft. lbs.).
Type of bolt Thread Max. torque
Hex head bolts, hexagon
socket bolts
M 6 10 Nm (7 ft. lbs.)
Hex head bolts, hexagon
socket bolts
M 8 25 Nm (18 ft. lbs.)
Hex head bolts, hexagon
socket bolts
M 10 45 Nm (32 ft. lbs.)
Hex head bolts, hexagon
socket bolts
M 12 75 Nm (53 ft. lbs.)
Hex head bolts, hexagon
socket bolts
M 14 120 Nm (85 ft. lbs.)
Hex head bolts, hexagon
socket bolts
M 16 200 Nm (141 ft. lbs.)
Pipe connections (cutting ring
screwed fittings)
hand tight + 1/2 turn
Tab. 8 Bolt torques
9 | Maintenance OPERATING MANUAL
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A_002_en
28.08.2019
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