Design And Principle Of Operation - Samson 3273 Mounting And Operating Instructions

3 Design and principle of oper-
ation
The Type 3273 Side-mounted Handwheel
with 30 mm travel is suitable for mounting
on SAMSON Series 240, 250, 280 and
290 Valves or on suitable interfaces together
with the Type 3271 or Type 3277 Pneumatic
Actuators with areas of 175 to 1400-
60 cm². A special version of the side-mount-
ed handwheel can also be used to move the
valve when a pneumatic actuator is not
mounted on it.
The side-mounted handwheel is mounted be-
tween the valve and actuator. The handwheel
can remain mounted on the valve during
maintenance and repair work or while ex-
G63 G16 G65
Fig. 3: Sectional drawing of Type 3273 Side-mounted Handwheel
EB 8312-2 EN
G7

Design and principle of operation

changing the pneumatic actuator. The hand-
wheel can be used in this case to move the
valve manually to its closed or open position.
The handwheel can be used to move the
valve manually opposing the spring force of
the pneumatic actuator upon signal or sup-
ply air failure.
The worm shaft unit, consisting of the worm
shaft and worm-geared wheel, is driven over
the handwheel. The spindle nut transfers the
rotary motion to the threaded rod, which
moves the valve. Depending on the direction
of rotation and mounted valve, the threaded
rod extends or retracts.
G6 Handwheel
G7 Handle
G11 Locking bolt
G6
G16 Threaded rod
G63 Spindle nut
G64 Worm shaft
G11
G65 Worm-geared wheel
G64
11