\KG2-KG4-Wartungsanleitung DN350-500 (GB) (GR) 16.12.2013
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Operating instructions
Maintenance / Mounting
butterfly valve series KG2 / KG4
DN 350 – DN 500
Maintenance
The valves do not require any special maintenance. For valves with DVGW approval according to DIN
EN 13774 - tightness class 2 / DIN EN 1074-2 (DG-4313 BU0327 and DW-6201BU0331)
maintenance must be done by the manufacturer. Otherwise the approval is no longer valid.
Disassembly
(Valves without DVGW approval)
Valves with actuator:
Loosen the fastening screws between the valve and the actuator or between the valve and the
bracket and remove the actuator.
Turn the disc (3) to "OPEN" position.
After removing the stem, the disc is no longer secured in the valve and must be prevented from falling
out.
Loosen the hexagon screws (5) at the disc (3) and remove them.
Remove the O-rings (6).
Pull the stem (4) out of the body (1).
Press the disc (3) out of the seat (2).
Lever the seat (2) out of the body (1), using a suitable blunt tool
Remove the bearing including O-rings (7) from the body (1).
Check all parts for flawless condition and renew them, if required. Only use original GEFA
spare
parts.
Assembly
(Valves without DVGW approval)
Thoroughly clean all parts and check them for wear. Parts that show wear or corrosion must be
replaced to ensure operational safety in future.
Use silicone oil for the assembly, if the application permits this.
Insert the seat (2) according to the holes into the body (1). The two holes in the body and the seat
must be aligned.
Insert the disc (3) into the seat (2) in a way that the two holes for the connection of the stem are pointing
to the top flange. The disc should be in position "OPEN". It has to be ensured that the stem holes of the
disc are in line with the upper and lower holes in the seat (2) and the body (1).
Insert the stem (4) into the body (1) in a way that the key/square is pointing to the top flange. The key
respectively the groove on the square must be aligned parallel to the disc (3). Push in the stem until
the holes in the disc (3) and the threads in the stem (4) are in true alignment.
Insert the hexagon screws (5) with new O-rings (6) into the disc and tighten them.
Insert the bearing including O-rings (7) into the body (1).
After the assembly the disc has to be switched for several times (at least 4x) by 180°.
Check the seat and the stem tightness. Test pressure 1.1 x nominal pressure.
Valves with actuator:
Attach the whole actuator unit, align it and fasten it with screws.
