Metso neles, Инструкция по установке, обслуживанию и эксплуатации

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3 R 74 en 9
❑
Tap the seat (4) with a soft spindle all around the cir-
cumference from the upstream side to make it fall into
the body, Fig. 16.
❑
Turn the valve and lift the seat from the body
through the downstream flow port, Fig. 17.
❑
Clean and check the removed parts.
4.5.2 Installing the seat
The back seal (6) of the segment seat (4) is normally a
lip seal. The seat is easier to install if the back seal is
precompressed. An O-ring seal does not need
precompression.
❑
Clean the flow port that houses the seat. Remove
any burrs. Round off the edges using a fine abra-
sive paper and clean the flow port carefully, see
Fig. 18.
❑
Place the back seal (6) onto the seat (4).
❑
Lubricate the flow port, seat (4) and back seal (6) and
the lock spring (5) with a volatile lubricant, e.g. Hyprez.
Make sure that the lubricants are compatible with
the medium.
❑
Only for a lip seal: Push the seal carefully into
the flow port for about 15 minutes, Fig. 19. The
following work phases must be completed before
the precompression is lost.
❑
Place the lock spring (5) on the seat.
❑
When the valve is opened, the ends of the spring
must be by the V-shaped opening, see Fig. 20.
❑
Place the seat package into the body as shown
in Figs. 21 and 22.
Fig. 16 Knocking off the seat
Fig. 17 Lifting the seat
Fig. 18 Rounding the sharp edges
Fig. 19 Precompression of the lip seal
Fig. 20 Mounting the seat
Fig. 21 Slipping the seat into the body
sharp edges
must be
rounded off sharp edges
must be
rounded off