Proceed in reverse order. O-rings (13, 14 15 and 16) shall be lubricated with suitable grease before
reassembling. Please note ”Important when assembling ” below. If the o-rings show sign of wear or
other damage, check if the most appropriate o-ring material has been used. Check the sliding ring
(13A) replace if necessary. The sliding ring is not necessary for the valve function but will increase the
efficiency and life of the shaft seal. Proper mounting of the sliding ring may be done only with the
appropriate tool as shown in fig 2.
DN25 (1”) a) Check carefully that the groove for the o-rings (13 and 14) is clean and
free from damage. Also check the conical entrance on the bearing sleeve
and lower shaft hole on the body.
b) Apply silicon grease generously on the O-rings before assembling. Mount
the sliding rings (13A), and the ball sector (3) with tool shown in fig 2.
c) Mount o-ring (13) on the drive shaft but not on the lower shaft. Insert the
drive shaft into the big inlet hole in the body and then into the big shaft
hole so that the ball sector now is in the body.
d) Mount O-ring (14) on bearing sleeve (4) and roll up the bearing (9) on its
place in the bearing sleeve. Carefully mount the bearing sleeve on the
drive shaft taking notice that the bearing (9) and O-ring (13) not is
damaged.
e) Mount the split ring (4A) in its groove on the bearing sleeve(4) then push
the bearing sleeve out from the body until the split ring meets the valve
body. Hold the bearing sleeve in this position and push the lower shaft
through its hole in the body as much as it needs to mount the O-ring (13)
from the outside of the valve body. Apply lubricant generously.
f) With greatest care, push the shaft and O-ring into its place in the valve
body using a proper tool, f. ex. the sliding ring tool, see fig 2. Use the tool
to push the O-ring, alternately pull the shaft, until the O-ring reaches its
sealing position. This position is reached when the ball sector sphere are
in the middle of the body.
g) Mount O-ring (15) and seat (10) in the holding ring (2) and O-ring (16).
Turn the ball sector clockwise into closed position.
h) Mount the seat holding ring with screws (11). Check that the seat holding
ring is in full contact with body. Eventually the holding ring can be pressed
to the body with help of a jaw vice with soft grips.
i) Turn the bearing sleeve so that the hole for the stop screw (1B) pointing in
right direction, then push the flange (1A) into position. Mount stop screw
(1B) carefully checking that it goes fully into the hole in the bearing sleeve.
j) Mount the nut (12) slightly with fingers. Fasten the flange (1A) into a vice
and tighten nut (12) hard with a box-spanner.
k) Turn ball sector between open and closed a few times to ensure that the
necessary torque is normal, approx 5 Nm, during the hole stroke.
