Samson TROVIS 3731-3, Монтаж и эксплуатация

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4.1.2 Type 3277 Actuator
Refer to Table 2 on page 31 for the required
mounting parts and accessories.
Actuators with 175 to 750 cm²
Mount the positioner onto the yoke as shown
in Fig. 5. The signal pressure is routed to the
actuator over the connection block (12), for
actuators with fail-safe action "Actuator
stem extends" internally through a bore in
the valve yoke and for "Actuator stem re-
tracts" through external piping.
1. Place follower clamp (3) on the actua-
tor stem, align and screw it tight so that
the mounting screw is located in the
groove of the actuator stem.
2. Mount cover plate (10) with the narrow
side of the cut-out (Fig. 5, left) pointing
towards the signal pressure connection.
Make sure that the bonded gasket (14)
points towards the actuator yoke.
3. Actuators with 355, 700 and 750 cm²:
Remove the follower pin (2) at lever M
(1) on the back of the positioner from
pin position
35 , reposition it in the hole
for pin position 50 and screw tight.
Actuators 175 to 350 cm² with 15 mm
travel:
The follower pin (2) remains in
pin position 35 (delivered state).
4. Insert formed seal (15) into the groove
of the positioner housing, pressing the
four retaining rings over the housing
screws and both fittings into the hous-
ing recesses.
5. Thread the bias spring (17) through the
crosspiece underneath the lever (1) and
push into the hole in the housing. Push
the lever (1) until it engages into place.
Place positioner on the cover plate (10)
and fasten it using three fixing screws.
Check whether the follower pin (2) rests
on top of the follower clamp (3).
The lever (1) must rest on the follower
clamp with spring force.
6. Make sure that the tip of the gasket
(16) projecting from the side of the
connection block (12) is positioned
above the actuator symbol that corre-
sponds with the actuator with fail-safe
action "Actuator stem extends" or "Ac-
tuator stem retracts." If necessary, re-
move the three fixing screws and the
cover plate. Then reposition the gasket
(16) turned by 180°. The previous ver-
sion of the connection block (Fig. 5,
bottom) requires the switch plate (13) to
be turned such that the corresponding
actuator symbol points to the marking.
7. Actuators with 175 cm²: Unscrew the
filter from the signal pressure input and
first screw the screw restriction (acces-
sories order no. 1400-6964/item no.
0390-1424) into the input and then the
filter.
8. Place the connection block (12) with the
associated seal rings against the
positioner and the actuator yoke. Screw
it tight using the fixing screw (12.1).
For actuators with fail-safe action "Ac-
tuator stem retracts", additionally re-
move the stopper (12.2) and attach the
external signal pressure line.
20
EB 8387-3 EN
Attachment to the control valve – Mounting parts and accessories