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• Fasten the gear fixing screws
Picture 16: Replacement of O-ring – Step 5
• If necessary, readjust the limit stop of the gear. The limit stop
must only be adjusted when the valve is in closed position.
AUMA worm gear units are adjusted as specified in the AUMA
90° Gear Operation Manual.
8
Trouble-shooting
Caution:
For all repair and maintenance work, please observe the
general safety instructions described in Section 7.1!
Problem
Valve makes noise
Valve cannot be operated
Leaks in the body seat
Cavitation in valve
Leaks at the body
High operating forces
9
Head office
VAG-Armaturen GmbH
Carl-Reuther-Str. 1
68305 Mannheim
Germany
Phone: +49 (621) 749-0
Fax: +49 (621) 749-2153
info@vag-group.com
http://www.vag-group.com
Service
Our service hotline can be reached 24/7 world-wide. In case of
emergency, please contact us by phone.
Service hotline: +49 621 - 749 2222
Service per email: service@vag-group.com
Cause
Unfavourable installation position
causing unfavourable flow around
or inside the valve (e.g. installed too
closely downstream of an elbow etc.)
Valve operating beyond its design limits
Foreign matter jammed in the seat area
Gear blocked
No electrical connection of electric actuator
Unfavourable flow and im-
pairment of movement
Valve not completely closed yet
Valve seal damaged or worn
Valve operating beyond its design limits
Operational data changed
Deterioration of seals
Seat of the valve polluted by deposits
Valve is dry in pipeline, no medium present
How to contact us
Remedial action
Change installation position
Check design and/or operation data, change flow resistance
in the valve, if required, by using different internals
Flush valve, dismantle, if necessary, and remove foreign matter
Undo block
Establish electrical connection
Change installation position
Close valve completely
Replace seal
Butterfly valve not suitable for use as control valve. Re-
place valve by a more suitable valve type.
Replace seals
Flush valve, dismantle, if necessary, and clean seat area
Valve can be operated more easily when wet
VAG Operation and Maintenance Instructions • 15
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