Wilo Yonos MAXO - Page 22

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22 Installation and operating instructions • Wilo-Yonos MAXO/-D/-Z • Ed.01/2022-08
• The use of securing elements (e.g. spring lock washers) can result in leakages at the flange connection. They
are therefore not permissible. Use the washers supplied (scope of delivery) between screw heads/nut heads
and the combination flange!
• The permissible tightening torques listed in the table below must not be exceeded, even if screws of higher
strength (≥4.6) are used, since splintering may otherwise occur at the edges of the long holes. This may
cause the screws to lose their prestress and leakage can occur in the flange connection. Risk of scalding!
• Use screws of sufficient length. The screw thread must project by at least one pitch of screw thread from
the screw nut.
• Perform leakage test at maximum permissible operating pressure!
Screws and tightening torques
Flange-end pump PN6
DN32 DN40 DN50
Screw diameter M12 M12 M12
Strength class ≥4.6 ≥4.6 ≥4.6
Tightening torque 40Nm 40Nm 40Nm
Screw length ≥55mm ≥55mm ≥60mm
DN65 DN80 DN100
Screw diameter M12 M16 M16
Strength class ≥4.6 ≥4.6 ≥4.6
Tightening torque 40Nm 95Nm 95Nm
Screw length ≥60mm ≥70mm ≥70mm
Flange-end pump PN10
DN32 DN40 DN50
Screw diameter M16 M16 M16
Strength class ≥4.6 ≥4.6 ≥4.6
Tightening torque 95Nm 95Nm 95Nm
Screw length ≥60mm ≥60mm ≥65mm
DN65 DN80 DN100
Screw diameter M16 M16 M16
Strength class ≥4.6 ≥4.6 ≥4.6
Tightening torque 95Nm 95Nm 95Nm
Screw length ≥65mm ≥70mm ≥70mm
Installation steps
1. Close the shut-off valves in front of and behind the pump (Fig.III).