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Version 0 • Dokument-Nr. 74572811
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7.3 Replacing the Seat
The valve must be taken out of the pipeline for replacing the seat.
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Ensure that the pipeline is rendered depressurized and is empty.
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Completely close the valve, loosen the flange screws and remove them so far that the valve can be taken
out.
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Lay the valve down with the insert ring(1.4)* facing upwards.
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Loosen the set screws or cylinder screws (1.5)* and remove the insert ring.
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Remove the old seat (1.3)* as well as seal (1.19 / 1.20 Optional)*.Clean the body and insert ring in the area
of the seat-engaging surface.
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If necessary, glue a new sealing tape (1.19 / 1.20) * onto the insert ring.
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Lateral screw connection (1.5)*: Open the valve. For metallic seat, place the seat in the body and then place
the insert ring on the seat. For non-metallic seat rings, insert the seat into the insert ring and then place the
insert ring with the seat on the body. For double-seated rings (e.g. firesafe version), place the metallic ring
on the body, place the non-metallic seat in the insert ring and then place the insert ring with the non - metal-
lic seat on the metallic. Screw in setscrews (1.5) * only until the insert ring can be moved but can not be
pushed out. Close the valve disc to center the insert ring and the seat, alternately tighten the setscrews
hand-tight in order to fix the insert ring.
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Axial screw connection (1.5)*: Close the valve completely. For metallic seat, place the seat in the body and
then place the insert ring on the seat. For non-metallic seat rings, insert the seat into the insert ring and then
place the insert ring with the seat on the body. For double-seated rings (e.g. firesafe version), place the
metallic ring on the body, place the non-metallic seat in the insert ring and then place the insert ring with the
non-metallic seat on the metallic ring and alternately tighten the cylinder screws (1.5) *.
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*(See chapter 3 "Scope of delivery")
