Samson 3275A, Mounting And Operating Instructions, Page: 24 / 52

5-2 EB 8314-1 EN
Installation
Risk of actuator damage due to the use of
unsuitable tools.
Î
Only use tools approved by SAMSON
(
u
AB 0100).
See associated valve documentation for ad‑
ditional mounting instructions.
5.2.1 Mounting the actuator
onto the valve
See Fig. 5-1
To mount the actuator on the valve, proceed
as follows:
The valve and actuator are assembled with
special attention paid to the actuator's bench
range and direction of action. These details
are specified on the actuator nameplate (see
the 'Markings on the device' section).
1. Loosen the lock nut and stem connector
nut on the valve.
2. Firmly press the plug together with the
plug stem into the seat ring.
3. Thread down the lock nut and stem con-
nector nut.
4. Remove the clamps of the stem connector
and the ring nut from the actuator.
5. Slide the ring nut over the plug stem.
6. Place the actuator onto the valve bonnet
and secure it with the ring nut with a
tightening torque of 150 Nm.
7. Apply a signal pressure to the actuator to
extend the piston stem.
8. Screw on the stem connector nut by hand
until it touches the piston stem.
9. Turn the stem connector nut a further
quarter turn and secure this position with
the lock nut.
10. Position the clamps of the stem connector
and screw them tight using the following
tightening torque:
Actuator size (cm²) Tightening torque
(Nm)
314, 380 and 490 9
804 75±5
11. Align the travel indicator scale with the
tip of the stem connector clamp.
5.3 Valve accessories
Valve accessories are either mounted on the
yoke (314, 380 and 490 cm²) or over the
NAMUR interface (804 cm² only).
Refer to the mounting and operating instruc-
tions of the valve accessories to be mounted
for more details on their attachment and the
accessories required.
NOTICE !
Note
Tip