\AT-Einbauanleitung Dichtungen (GB).doc (BL) 31.03.2005
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Operating Instructions
Maintenance / Sealing replacement
DOMINO knife gate valves series AT
1. General information
1.1 Maintenance work may only be carried out by qualified and authorised people.
1.2 Routine valve maintenance is not necessary. However, the spindle (piston rod in the case of
pneumatic or hydraulic cylinders) must always be well greased and free of soiling.
1.3 In the event of a minor leak where the plate passes through, this can usually be eliminated by
resealing (see "General Operating Instructions"). If the leak cannot be stopped in this way,
complete sealing replacement must take place. We recommend having the manufacturer carry
out the sealing replacement.
1.4 The following special tools are required for sealing replacement:
o
Packing tool
o
Suitable cutting tools (scissors, sanding disc)
o
Suitable retaining fixtures (e.g. metal clamps) as a mounting aid
for cross-sealing and scraper
2. Spare parts
2.1 Only original spare parts may be used.
2.2 For complete sealing replacement, the following
spare parts are required:
o
Cross-sealing
(compact cross-sealing,
cross-sealing with scraper or
U-profile (PTFE) with
silicone base)
o
Suitable grease (e.g. Red Rubber)
o
Round seal
o
Ductile seal rhombic
o
Ductile seal round (
∅
4mm)
3. Dismantling and cleaning
For complete sealing replacement, the valve must be removed from the pipeline.
o
Check that the pipeline has been depressurised and emptied.
o
Loosen the connections (electrical and pneumatic).
o
Remove operating element.
o
Loosen and remove the flange screws.
o
Spread the flanges using a suitable tool and remove the valve and the seals.
o
Loosen the screw fastening on the two halves of the housing and set the housing parts
down on the side with the flange sealing surface.
o
Remove the old sealing material and clean the sealing areas thoroughly.
