Samson 3277 - Version with Direction of Action Actuator Stem Retracts; Versions; Accessories

3-4 EB 8310-6 EN
Design and principle of operation
3.5.2 Version with direction of
action "actuator stem
retracts"
When the signal pressure is reduced or the
control signal fails, the springs move the ac-
tuator stem upward and open a mounted
globe valve. The valve closes when the signal
pressure is increased enough to overcome
the spring force.
3.6 Versions
The Type3271 and Type3277 Pneumatic
Actuators with 240, 350 or 700cm² actua-
tor area are available in the following ver-
sions:
− Standard version
The top and bottom diaphragm cases are
made of painted sheet steel.
− Corrosion-resistant version
The top and bottom diaphragm cases are
made of stainless sheet steel (1.4301).
− Additional (top-mounted) handwheel
The actuators can be tted with an addi-
tional (top-mounted) handwheel
(uT8312).
− Travel stop
The actuators as a special version can be
tted with a mechanically adjustable
travel stop. The travel is reduced by up to
50% in both directions of action (stem
extends or retracts).
− Side-mounted handwheel
The actuators can be combined with a
Type3273 Side-mounted Handwheel
with max. 30mm travel (uT8312).
3.7 Accessories
Swivel hoist
The pneumatic actuators with 700cm² actu-
ator area have a female thread on the top
diaphragm case to allow an eyebolt or swiv-
el hoist to be screwed into it. The eyebolt can
be used to vertically lift the actuator and is
included in the scope of delivery. The swivel
hoist is designed for setting a control valve
assembly upright or for lifting the actuator
without valve. The swivel hoist can be or-
dered (accessories).
Actuator area
Item no.
Eyebolt
(DIN580)
Swivel hoist
700cm² 8325-0131 8442-1017
Lifting xture for small actuators
A special lifting tool is available to lift pneu-
matic actuators with 240 and 350cm² actu-
ator areas (uAB0100).
Vent plugs
Vent plugs are screwed into the exhaust air
ports of pneumatic and electropneumatic de-
vices. They ensure that any exhaust air that
forms can be vented to the atmosphere (to
avoid excess pressure in the device). Further-
more, the vent plugs allow air intake to pre-
vent a vacuum from forming in the device.
uAB07
Feedback connection (travel pick-off inter-
face) according to IEC60534-6-1
Various valve accessories according to
IEC60534-6-1 and NAMUR recommenda-