Samson 3372 Mounting and operating instructions - 4 Mounting On The Valve
16
EB 8313-3 EN
Mounting on the valve
4 Mounting on the valve
The valve and actuator are delivered sepa-
rately and must be assembled on site. If the
positioner is already mounted on the actua-
tor (on the support element), it must be re-
moved before the actuator can be mounted
onto the valve.
4.1 Type 3372 (120 cm²)
The actuator is normally mounted onto the
valve bonnet (34) using its crossbeam (59)
and a central nut (35).
However,theactuatorwithitstworodscan
also be mounted onto valves with the corre-
sponding valve bonnet without the cross-
beam. See section 4.1.2.
4.1.1 Mounting using a cen-
tral nut
Form B, see Table 1 on page 10
Fig. 4
ThistypeofmountingappliestoType 3321
andType 3323ValvesinDN 15to50as
wellasType 3531andType 3535Valvesin
DN 15to80.Itinvolvesmountingtheactua-
tor onto the valve bonnet (34) using a central
nut (35).
NOTICE
Do not undo the hex nuts (54) that
hold the crossbeam (59) in place on
the rod-type yoke.
Î
Unscrew the central nut (35) from the
valve bonnet (34).
Î
Push the plug together with the plug stem
into the seat.
Î
Place the actuator with the crossbeam
(59) onto the thread of the valve bonnet
(34), making sure that the central nut
(35,SW 36)isplacedovertheplug
stem, and fasten it to the valve bonnet.
This causes the actuator stem to be
presseddownapproximately1to2 mm
against the force of the springs.
Tightening torque of the nut = 150 Nm.
WARNING!
For actuators with fail-safe action
„actuator stem retracts“ (FE), air must
be applied to the top diaphragm
chamber until the actuator stem
touches the plug stem.
Risk of crushing! Do not touch the
yoke.
The stem connector clamps can then
be mounted between the actuator
stem and plug stem.
Î
Mount the stem connector clamps, while
aligning the follower clamp for the fol-
lower pin of the positioner parallel to the
support element.