Table of Contents
Advertisement
12 Repairs
If the ball valve no longer works properly or if it does not work at
all, it is defective and must be repaired or replaced.
NOTE
Damage to the ball valve due to improper maintenance and re-
pair!
Do not perform maintenance and repair work on your own.
Contact the After Sales Service at PFEIFFER for maintenance
and repair work.
In special cases, certain maintenance and repair work may be
performed.
The work described in this chapter may only be performed by
specialist personnel qualifi ed to perform the corresponding task.
The following instructions apply additionally for ball valves. For
decommissioning and disassembly, observe Chapter "10 Decom-
missioning" and Chapter "11 Disassembly".
Info
Please note when repairing!
Infl uences from the process medium and residues can affect the
torque for body connections when old balls and seals are reused,
see Table 15-1 in Chapter "15.1.1 Tightening torques".
12.1 Replacing the V-ring packing in the case
of a DIN ball valve, DN 15 ... 100
If a leak is found in the stuffi ng box (6), the PTFE rings of the
V-ring packing (5) could be defective.
Check the condition of the V-ring packing.
Disassemble the ball valve to remove the packing. For this pur-
pose, observe Chapter "1 Safety instructions and safety meas-
ures".
Place the ball valve on an even and clean work surface so
that the packing space is easy to reach.
Loosen the screws (9) and remove the stuffi ng box fl ange (6)
with the bearing bushing (7) carefully.
Remove the spring washers from the set of spring washers
(8).
Remove the bushing (14).
Remove the V-ring packing (5).
Check the PTFE rings of the V-ring packing as well as all
plastic and graphite parts for damage and, in the case of
doubt, replace them.
Assemble the ball valve as described in Chapter 3.5.1 and
3.5.2.
EB 20b_EN
February 2022 edition
Subject to technical changes
12.2 Replacing the V-ring packing in the case
of a DIN ball valve, DN 150 ... 200
If a leak is found in the stuffi ng box (6), the PTFE rings of the
V-ring packing (5) could be defective.
Check the condition of the V-ring packing.
Disassemble the ball valve to remove the packing. For this pur-
pose, observe Chapter "1 Safety instructions and safety meas-
ures".
Place the ball valve on an even and clean work surface so
that the packing space is easy to reach.
Loosen the screws (9) and remove the stuffi ng box fl ange (6)
with the bearing bushing (7) carefully.
Remove the spring washers from the set of spring washers
(8).
Remove the centring ring (18).
Remove the spring washer(s) (16) and bushing (15).
Remove the V-ring packing (5) and bushing (17).
Check the PTFE rings of the V-ring packing as well as all
plastic and graphite parts for damage and, in the case of
doubt, replace them.
Assemble the ball valve as described in Chapter 3.5.3.
12.3 Replacing the V-ring packing in the case
of a ANSI ball valve
If a leak is found in the stuffi ng box (6), the PTFE rings of the
V-ring packing (5) could be defective.
Check the condition of the V-ring packing.
Disassemble the ball valve to remove the packing. For this pur-
pose, observe Chapter "1 Safety instructions and safety meas-
ures".
Place the ball valve on an even and clean work surface so
that the packing space is easy to reach.
Loosen the screws (9) and remove the stuffi ng box fl ange (6)
with the bearing bushing (7) carefully.
Remove the spring washers from the set of spring washers
(8).
Remove the centring ring (18).
Remove the spring washer(s) (16) and bushing (15).
Remove the V-ring packing (5) and bushing (17).
Check the PTFE rings of the V-ring packing as well as all
plastic and graphite parts for damage and, in the case of
doubt, replace them.
Assemble the ball valve as described in Chapter 3.5.4.
12.4 Replacing the seal ring of the ball
If the ball valve leaks in the passage, the seal ring (4) and/or
the ball (3) is defective.
Check the condition of the seal ring and ball.
Repairs
12-1
Advertisement
Table of Contents
