18 2 BAR 70 en
View X of Figure 24
Figure 24 Retaining ring with clamp type socket
5. The sealing element (320) and the O-ring (304) in the seal-
ing ring (301) can be replaced now (see figure 25 - 27)
Before assembling the new seals, the sealing groove in
the body (101) and the sealing ring (301) must be
cleaned carefully. Installation of the sealing ring must
be done with caution for protecting the seals from
damage.
For valve size 3"-12”/DN80-300 in class Cl300/PN40 and
3”/80DN in Cl 600/PN63
Reinstall the retaining ring (310) finally.
The retaining ring should be undamaged and may not
show any bends. The spiral coils must be properly superim-
posed in the uninstalled state. Otherwise, a new retaining
ring is to be used!
Note that that the retaining ring fully adjoins the base of
the groove along the entire perimeter. The retaining ring
must not move by the power of hand along the peripheral
direction.
For valve size 16", 20"/DN400, DN 500 in class Cl300/
PN40 and all sizes in Cl600/PN63, except 3"/DN80.
Reinstall the retaining ring (310) and the clamp type socket
(311).
The retaining ring should be undamaged and may not show
any bends. Otherwise, a new retaining ring is to be used!
Fix the screw (313) using a new tab disc (312) as well as Loc-
tite 2701 and activator 7471 (see point 3).
Information: Please read the Loctite product instructions
before use.
6. Check the high-performance valve for its seal-tightness
before reinstallation. You will find the installation
instructions in chapter 3.3.
Figure 25 Replacing sealing element
Figure 26 Sealing ring with O-ring
Figure 27 Replacing sealing element
10.7 Maximum allowable closing torques of the
valves without drive at 0 bar
Torque Mc in Nm
The torque exceeds the tolerance limits of the sealing ele-
ment. The torques applies to ungreased sealing elements.
The values should not be exceeded.
The valve should also be tested with a differential pressure
in the seated position, if possible. Strongly deviating tor-
ques refer to unallowable diametrical clearance or
improper seating of the sealing element. The use of another
sealing element can eliminate the problem depending on
the specific case.
CL DN Mc PS=0bar Mc PS=40bar
300
80 / 3" 30 70
600
300
100 / 4" 30 70
600
300
150 / 6" 40 120
600
300
200 / 8" 40 220
600
300
250 / 10" 80 550
600
300
300 / 12" 200 670
600
300
400 / 16" 350 1350
600
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