2.2 Attachment according to
IEC 60534-6
For the selection of the required mounting
parts, refer to Tables 4 and 5 (page 21).
The positioner is attached according to
NAMUR using an adapter housing as
shown in Fig. 4. The valve travel is trans-
mitted via the lever (18) and the shaft (25)
to the bracket (28) of the adapter housing
and then to the pin (27a) located at the posi-
tioner lever.
To attach the positioner, the mounting parts
listed in Table 4 are required. Which lever
is to be used depends on the rated valve
travel.
Once the positioner is attached, however,
the
arrow
on the black case cover has to
point downwards
away
from the
dia-
phragm
actuator
. (
Exception
: Control
valves in which the plug closes the seat area
when the actuator stem retracts. In this case,
the arrow has to point
towards
the dia-
phragm actuator).
Note!
For quick-acting control valves (transit time
< 0.6 s), it is necessary to replace the filter
installed in the output pressure bore (Output
38) with a screw-in throttle (accessories spe-
cified in Table 4).
2.2.1 Mounting sequence
NOTE
Before you mount the parts, load the actua-
tor with air pressure so that the valve is set
to 50 % of its travel. This will ensure the
exact alignment of the lever (18) and the
bracket (28).
Control valve with cast yoke
1. Use countersunk screws to screw the
plate (20) to the coupling which con-
nects the plug and actuator stem. With
2100 and 2800 cm
2
actuators, use ad-
ditional mounting bracket (32).
2. Remove rubber plug from the adapter
housing and fasten the housing to the
NAMUR rib, using the hexagon head
screw.
Control valve with rod-type yoke
1. Screw plate (20) to the follower clamp
of the plug stem.
2. Screw studs (29) into the adapter hous-
ing.
3. Place the housing with the plate (30) on
either the right or left side of the valve
rod and screw the housing tight by
using nuts (31). While doing so, make
sure that lever (18) to be mounted sub-
sequently is horizontal (when the valve
is at midtravel).
4. Screw the pin in a hole in the center
row of holes in the plate (20) and lock it
such that it will be located above the
correct lever marking (1 to 2) for the as-
signed travel, see Table 5. Intermediate
values must be calculated. Beforehand,
18
EB 8380-1 EN
Attachment to the control valve
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Summary of Contents for 3780 series
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