4.650B_UK - 5
Ref. 4.650B_UK - 2015-01-14. www.axel-larsson.se
MANUAL
BALL SECTOR VALVE AL 74-KS / KSP
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.
DN 40-50 (1½"-2")
(reassembly is done in reverse order)
Sliding ring (13A) can only be mounted with the tool shown in fig 2.
When O-ring (13) has been placed in its groove on the shaft (5) and
drive shaft (6) and then pushed into the body great care must be
taken not to damage the o-ring. Fig. 3 shows a suitable method and
dimensions on a tool that will protect the O-ring (13) and Rulon
bearing (9) when assembling.
Check that the locking ring (4A) is undamaged and kept in some
tension in its groove after reassembly. Change ring if necessary.
DN 80 - 300 (3"-12")
(reassembly is done in reverse order)
Sliding ring (13A) can only be mounted with the tool shown in fig 2.
Carefully push the bearing sleeve (4) with the O-ring (14). When the
O-ring passes the drilled hole for the stop screw (12) it might be
pressed into the hole with risk for damage. Check that the hole is
free from sharp edges or burrs. When the O-ring passes the hole it
can be pushed back from out side with a blunt end pin.
Check that the locking ring (4A) is undamaged and kept in some
tension in its groove after reassembly. Change ring if necessary.
After reassembly
Pressure test the valve with air from the valves outlet side and with
the valve closed. The valve immersed in water or with leakage spray
shall be bubble tight over shaft seals and seat. I small bubbles can be
detected around the shafts it can be enough to actuate the valve a
few times allowing the O-rings to find its correct position. If the valve
still leaks the o-ring has been damaged and must be changed. Valves
with PTFE-seat shall be bubble tight in both directions. Valves with
stellited seat will never be bubble tight. These valves can be tested
with water. Max leakage for a new valve is 0,01% of the valves Cv/
Kvs-value.
Mounting actuator on the
valve - IMPORTANT!
a) Avoid to axially move the ball sector in the valve body. Never ham
mer on the drive shaft end when mounting the actuator.
b) The ball sector must not be turned more than 900 necessary to
operate the valve from closed to open position. If the ball sector
accidentally has been turned out of the range, the screws on the
inlet cover must be loosened and the contact pressure between
ball sector and seat ring reduced to zero before the ball sector is
returned to right position.
c) When the actuator is properly mounted and adjusted it shall turn
the ball sector 900 between open and closed. Closed position of
the ball sector sealing surface shall for optimum tightness be such
that the seat ring is located in the middle of the sealing surface as
indicated in fig. 4.
Fig. 2 - Tool for mounting gliding ring and O-ring.
DN
Dy
Dj
L1
L2
L3
150-200
32
26
100
40
36
250
38
32
110
45
42
300
50
40
130
60
55
