Maintenance
18
INOXPA S.A.U.
10.250.30.02EN · (0) 2019/09
8.5. REPLACING THE SEAT SEAL
1. Put the plug shaft in a vertical position
–for example, with
a bench clamp- so that the shaft is kept stable and no
damage is caused to the mating surface of the conical
seal. Do not press the shaft too much if using a bench
clamp.
2. Remove the used seal using a screw driver or a sharp
hook-shaped tool. Make sure not to damage the mating
surface of the seal.
3. Lubricate the new seat seal with soapy water if necessary
to facilitate installation.
4. Insert the seal in the plug shaft seat accommodation so
that its edges are inside the accommodation. Preferably
the seal should fit within the part of the section that has
the greatest diameter, as shown in the figure.
5. Then, with the help of an appropriate tool (not piercing),
press the edge of the seal that hasn't yet fit into the
accommodation, as shown in the figure.
6. This operation should be done around the entire diameter,
applying the tool in the sequence
1-2-3-4-5-6-7-8
as
shown in the bottom figure. Always press on opposite
sides. Once you get to the last step of this sequence,
repeat the process until the seal is completely inside the
accommodation.
7. Press the seal with your fingers to make sure it is well
seated. Make sure there are no parts projecting due to
poor positioning of the seal.
The following tools are needed to assembly/disassembly the valve:
to unscrew the top shaft from the bottom shaft of the valve:
a crescent spanner 13 mm for remove the clamps,
appropriate tool (not piercing) to mount the seat seals,
a crescent spanner as per the table:
Zone
DN 40
DN 50
DN 65/80
DN100
Actuator
17 mm
Bottom shaft
27 mm
30 mm
49 mm
Zone
DN 40/50/65/80
DN 100
Lantern
13 mm
19 mm
1
0
.2
4
0
.3
2
.0
0
1
7
1
0
.2
5
0
.3
2
.0
0
1
9
1
0
.2
5
0
.3
2
.0
0
1
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