Series 541
REPAIRS
291187ED
Edition 2015-07-09
17/25
7.1
Replacement of dynamic seal – FLEX VATRING
In case of a seat seal leak caused by environmental influences, the FLEX VATRING seal
can be replaced twice without the need for re-machining the valve seat.
Three seal rings of different diameters enable leak tight sealing on three different levels of
pre-prepared sealing surface provided in the valve body. If there is damage on one level,
the replacement seal ring, of a different diameter, will seal at the next level.
VAT offers a range of service kits; see «Table 11-1» on page 25. The seal exchange is
easily carried out by the user.
Initial sealing system
(maximum seal ring diameter)
Sealing system after installation of the
service kit 1
(intermediate seal ring diameter)
Sealing system after installation of the
service kit 2
(minimum seal ring diameter)
21/1
Valve gate
36/1
Maximum seal ring diameter (Initial seal)
Y1
Intermediate seal ring diameter (Service kit 1)
Y2
Minimum seal ring diameter (Service kit 2)
36/2
Flat seal
60
Holding ring
65
Nut
66
Washer
X1
Washer (Service kit 1)
X2
Washers (Service kit 2)
68
Bonnet screws
A
Flange A (valve seat side)
B
Flange B
Figure 7-1
21/1
36/1
60
66
65
21/1
Y1
X1
60
66
65
21/1
Y2
X2
60
66
65
