7
Flow Control
Kämmer Control Valves
®
6.4.3 Unscrew the coupling insert until the yoke rods are
raised from the lower yoke plate by around 2 mm.
nOte:
Ensure that the plug assembly is not rotated with
the plug seated. This may cause irreparable damage
to the seating faces.
6.4.4 Refit the coupling, ensuring that the arrows, embossed
on the coupling halves, point upward towards the
actuator, and secure with 2 retaining screws.
6.4.5 Apply supply pressure resp. vent actuator to half stroke
and refit and tighten yoke rod retaining nuts (5).
6.4.6 Connect all tubing.
7
dIsasseMble and asseMble valve
7.
disassemble valve
(see Fig. 2)
7..
Remove bonnet flange bolting and raise bonnet and
plug assembly.
nOte:
heavy assemblies may require a hoist
7..2
Unscrew seat ring using seat ring tool and carefully
press plug stem evenly out of the upper body.
7..3 With valves DN 80 / kv 63 and larger, the plug head
can be unscrewed (see Fig. 3). Remove plug head
from stem by securing valve stem against rotation
with a hooked spanner and turning plug head with
an adjustable face pin tool.
7..3 Check seating faces of seat ring and plug for damage.
Gasket surfaces must be clean and free of damage.
7..4
Press guides, packing and packing follower from be-
low using a drift (the drift must have a slightly larger
diameter than the plug stem).
nOte:
To prevent damage to the plug or plug stem,
follow the above instructions precisely.
7..5 If a seat surfaces need re-machining, seat
and
plug
seating surfaces must be reworked. The seat angle
on the plug is 30°, on the seat ring 25°. If the valve
is correctly assembled, lapping is not required.
nOte:
When re-machining the plug, protect plug stem
from damage. The seat surface must be concentric
to the plug stem. When re-finishing the seat, the
seat surface must be concentric to the seat outer
diameter.
7.2
assemble valve
(see Fig. 2)
7.2. All worn or damaged parts must be replaced. Reus-
able parts must be clean. Expendable parts such
as gaskets, packing and O-rings should always be
replaced.
7.2.2 Insert seat ring and tighten. For torques, see following
table:
7.2.3 If necessary, screw plug head back on to stem and
carefully guide plug stem through the bonnet, to avoid
damage.
7.2.4 Insert new bonnet gasket.
7.2.5 Position bonnet slowly and absolutely upright on body
to avoid damage to seat/plug.
7.2.6
Tighten bonnet flange bolts alternating crosswise fin-
ger-tight and then tighten with a wrench. For torques,
see following table:
7.2.7 Replace packing by inserting packing rings one at a
time tapping each one down with a suitable bush-
ing.
nOte:
ensure that the gaps in the packing rings are
distributed evenly around the circumference in the
packing box (gaps
not
in line).
Different packings and fitting sequencess are shown
in the spare parts list.
7.2.8 Insert packing follower. Fit gland nut for
transport
purposes only. Gland nut to be fitted correctly and
tightened down when actuator is mounted (see table ).
size
body
torque
material
DN 5/25 (½ /")
.458 cast
25 Nm
.457 forged
25 Nm
DN 40/50 ( ½ /2")
.458
200 Nm
.457
255 Nm
DN 80 (3")
.458
230 Nm
.457
270 Nm
DN 00 (4")
.458
400 Nm
.457
500 Nm
DN 50 (6")
.458
450 Nm
.457
600 Nm
Hex bolt. Waisted bolt
studs
thread
dIn 933 dIn 2510 dIn 939
a2-70
1.7709 1.7258
cK 35
M 8
20 Nm
–
–
–
M 0
35 Nm
–
–
20 Nm
M 2
60 Nm
44 Nm 36 Nm
35 Nm
M 6
45 Nm
5 Nm 92 Nm
80 Nm
M 20
280 Nm
–
–
–
M 24
250 Nm
–
–
270 Nm
