Flowserve KV10 Outer Butterfly Valve - Manual (Page 4)

4
Dismantling
For the removal of the valve proceed
in reverse order.
Important Note
Do not damage gaskets during
installation.
Maintenance
The butterfly valve does not require any special
maintenance.
Important Note
Check main seal Q and the torque (80 ± 5 Nm)
of the fixing bolts T when inspecting the valve,
at least on the occasion of the “Inspection and
Examination” of the tank container which takes
place every 2½ years and whenever carrying
out maintenance or repair work.
Replacemente of disc
main seal
■ Main seal can be replaced without having to
extract the disc.
1. Remove the butterfly valve and the square
spigot outlet.
2. Remove seat ring R and seal Q from the
body.
3. Insert new seal, with the disc being in the
closed position.
Replacement of bearing bush and
stem sealing
Important Note
In order to remove the operating lever you must
destroy the wire seal between operating lever
and stem. There is a second seal between the
notch plate
D and the body flange K . (Fig. 1)
1. Loosen screw B (secured with retainer,
e. g. Loctite 222) and remove operating lever
from stem.
2. Unscrew socket-head cap bolts C and lock
nuts L .
3. Remove notch plate D .
4. Pull out stem E with the aid of operating
lever.
5. Remove bushes F + J and rings from
the stem guide.
6. Clean location hole for stem. Do not
damage the sealing surface for the
O-rings.
7. Insert new bushes J and F .
8. Apply a smear of lubricant to the new
O-rings I + H and ring G and push
them onto the stem. Consider correct order
and right position. Remove surplus
lubricant from the stem bearing surface.
9. Push stem E into stem guide.
10. Install notch plate D and operating lever
in reverse order.
11. Secure screw B (e. g. with the aid of
Loctite 222).
12. Re-establish wire seal so that you can see
if the valve has been tampered with.
Replacement of sleeve
and journal
1. Press retaining ring O out of the groove
and push towards the body.
2. Press journal N out of the body upwards
through disc lug by using the retaining ring
groove.
3. Pull bush P out of the body and insert new
bush.
4. Put retaining ring O onto bottom hexagon
lug and introduce journal N through the
hexagon socket disc lug.
5. Push journal completely into the body and
press retaining ring into the corresponding
groove.