4.6.2 Sizes DN 50-400
Place the valve in a standing position on the pipe flange
end. Use a level surface that will not scratch the flanges.
See that the body stud nuts (16) are facing upward.
Mark the the body halves for correct orientation during
re-assembly.
Turn the ball to the closed position.
Unscrew the body stud nuts (16).
Remove the body cap (2). If the seat (7) is not lying on
the ball (3), prevent the seat from falling from the body
cap and detach it later.
Don’t leave your fingers
between the body cap and the surface!
Stand the removed body cap on its pipe flange. See Fig. 17.
Remove the seat from body cap if it is still in place. If the
seat is locked, it must be removed using a special tool (see
Fig. 18 and section "Tools").
Lift the ball (3) from the body (1) by gripping by the flow
bore (small sizes) or by passing a rope through the flow
bore and turning it at the same time around the flow bore
axis. Handle the ball carefully and place it on a soft surface.
See Fig. 19.
Pull the spline driver (4) from the stem (5) and remove
the seat (7) from the lower body half (1).
Remove the gland follower (9).
Push the stem into the body and remove it.
Remove thrust bearing(s) (70), secondary stem seal (71),
packing rings (69) and body gasket (65). Also remove back
seals (63) in ball seats.
4.7
Inspection of removed parts
Clean removed parts.
See if the stem (5) or thrust bearings (70) are damaged.
See if the ball (3) or seats (7) are damaged (scratched) by
examining them under bright light. The ball and the seat
can be replaced if necessary.
See if the body joint flanges are damaged.
4.8
Replacing parts
We recommend that soft material parts be replaced whenever
the valve is dismantled for servicing. Other parts may be replaced
if necessary. Always use genuine spare parts to ensure proper
functioning of the valve (see section "Ordering spare parts").
Fig. 17.
Lifting the body cap
Fig. 18.
Removing the locked seat
Fig. 19.
Removing of the ball
9
Summary of Contents for M07
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