VAG Operation and Maintenance Instructions • 10
6.3.3 Replacement of the seals (3.2 and 8)
• Unfasten the cylindrical screws (9) crosswise
• Lift off cover (2) of the valve
• The seals, float, shell and shut-off device can now be removed
• The seal (3.2) is attached to the float (part 3.1) by cyanoacrylate
adhesive (rapid set adhesive). When replacing the seal, pull it off
the float and then glue the new seal to the float.
• For subsequent reassembly, place the shell into the body. Place
the float into the shell, insert the seal (part 8) as well as the
retaining washer (part 7) into the cover and centre it. Insert the
shut-off device into the guide screw (part 6) and place the cover
onto the body. Fasten the hexagon socket screws crosswise.
Cylinder screw (9)
M 12
M 16
M 20
30 Nm
10 Nm
20 Nm
Table 1: Cylinder screw tightening torques
Plug (11)
G½“
30 Nm
For all repair and maintenance work, please observe
the general safety instructions described in Section 6.1!
7 Trouble-shooting
Table 2: Plug tightening torques
Problem
Cause
Remedial action
Leaking main air valve
Foreign matter stuck in seat
area
Flush valve, possibly disassemble and remove foreign
matter
Internal pressure too low
To achieve tightness internal pressure must be at least
3 m water column. Replace gasket with a low pressure
gasket (0.1 - 1 bar)
Deposits from medium on the
seat
Open cover, clean seat section
Sealing damaged
Replace sealing (recommendation: replacement after a
maximum of 5 years) see 6.3.3
Improper installation position
Change installation position
Leaky air release orifice
Foreign matter stuck in air
release orifice
Flush valve, possibly disassemble and remove foreign
matter
Sealing defective
Replace sealing (recommendation: replacement after a
maximum of 5 years) see 6.3.3
Air release orifice rate too small
Operational characteristics
were changed
Check layout and operational characteristics, if neces-
sary, install special air release orifice with larger release
bore
Outlet clogged
Insect infestation
Clean valve and attach insect protection
6.3.4 Bolt tightening torques
8 How to contact us
Head office
VAG GmbH
Carl-Reuther-Str. 1
68305 Mannheim
Germany
Telephone: +49 (621) 749-0
Fax: +49 (621) 749-2153
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
