Samson EB 20a, Mounting And Operating Instructions

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12-3
EB 20a_EN
May 2022 edition
Subject to technical changes
Repairs
Table 12-1: Parts list
Pos. Designation Pos. Designation Pos. Designation
1 Body with lining 11 Stuf fi ng box fl ange 21 Set of spring washers
2 Ball with coating 12 Screw 22 Thrust ring
3 Seat ring 13 Hand lever 23 V-ring packing
4 Screw/ stud bolt 14 Center ring 24 O-ring
5 Nut 15 PTFE bush 25 Stuf fi ng box upper section
6 Spring washer 16 Spring washer 26 Screw
7 V-ring packing 17 Bush 27 Screw plug
8 Thrust ring 18 O-ring 28 Washer
9 Set of spring washers 19 Stuf fi ng box lower section 29 Pin
10 Bearing bush 20 Distance bush
12.3 Replacing the seal ring of the ball
If the ball valve leaks in the passage, the seal ring (3) and/or
the ball (2) is defective.
Ö
Check the condition of the seal ring and ball.
Disassemble the ball valve to remove the seal ring and ball. For
this purpose, observe Chapter “1 Safety instructions and safety
measures”.
Ö
Disassemble the ball valve as described in Chapter “12.1 Re-
placing the V-ring packing in the case of a DIN ball valve” or
Chapter “12.2 Replacing the V-ring packing in the case of an
ANSI ball valve”.
Ö
Place the ball valve with the fl ange on the body side (1) fac-
ing downward on an even and clean work surface, so that
the body connection nuts (5) are easy to access.
Ö
Undo the nuts (5).
Ö
Carefully remove the body halves (1).
Ö
Check the seal rings and ball as well as all plastic parts for
damage and, in the case of doubt, replace them.
The seal rings may not be installed without clearance. To achieve
the tightness of the ball valve, the seal rings must be installed in
their seat with suf
fi cient clearance. If this is not possible, please
contact PFEIFFER.
Ö
Assemble the ball valve as described in Chapter “3.5.1 As-
sembly of the DIN ball valve” or “3.5.2. Assembly of the AN-
SI ball valve assembly”.
12.4 Additional repairs
Ö
In the case of additional major damage, it is recommended
to have repairs performed by PFEIFFER.
Info
Ö
Disassemble the ball valve as described above, check the PT-
FE rings of both V-ring packings as well as all plastic parts
for damage and, in the case of doubt, replace them.
Ö
Assemble the ball valve as described in Chapter “3.5.1 DIN
ball valve assembly”.
12.2 Replacing the V-ring packing in the case
of a ANSI ball valve
If a leak is found in the stuf fi ng box (11), the PTFE rings of the
V-ring packing (7) could be defective.
Ö
Check the condition of the V-ring packing.
Disassemble the ball valve to remove the packing. For this pur-
pose, observe Chapter “Safety instructions and safety measures”.
Ö
Place the ball valve on an even and clean work surface so
that the packing space is easy to reach.
Ö
Loosen the screws (12) and remove the stuf fi ng box fl ange
(11) with the bearing bushing (10) carefully.
Ö
Remove the spring washers from the set of spring washers
(9).
Ö
Remove the centring ring (14).
Ö
Remove the spring washer (16) and bushing (17).
Ö
Remove the V-ring packing (7) and bushing (15).
Ö
Check the PTFE rings of the V-ring packing as well as all
plastic parts for damage and, in the case of doubt, replace
them.
Ö
Assemble the ball valve as described in Chapter “3.5.2 ANSI
ball valve assembly”.