Operation; Throttling Service; Manual Mode (Versions With Top-Mounted Or Side-Mounted Handwheel Only) - Samson 3276-D Mounting And Operating Instructions

6 Operation

The work described in this section is only to
be performed by personnel appropriately
qualified to carry out such tasks.
WARNING WARNING
! !
Risk of personal injury due to exhaust air
being vented.
The actuator is operated with air. As a result,
air is vented during operation.
Î Wear eye and hearing protection when
working near the actuator.
WARNING WARNING
! !
Crush hazard arising from the moving
actuator stem.
Î Do not insert hands or finger into the
yoke while the air supply is connected to
the actuator.
Î Before working on the actuator, discon-
nect and lock the pneumatic air supply
as well as the control signal.
Î Do not impede the movement of the actu-
ator stem by inserting objects into the
yoke.
Î Before unblocking the actuator stem after
it has become blocked (e.g. due to seiz-
ing up after remaining in the same posi-
tion for a long time), release any stored
energy in the actuator (e.g. spring com-
pression). See 'Relieving the spring com-
pression in the actuator' in the 'Removal'
section.
EB 8318 EN
WARNING
!
Risk of personal injury through incorrect
operation, use or installation as a result of
incorrect information on the actuator.
After any adjustment or conversion work, the
details on the actuator nameplate may no
longer be correct.
Î Immediately renew any nameplates or
labels with incorrect or outdated infor-
mation.
Î Add any new values to the nameplate. If
necessary, contact SAMSON to obtain a
new nameplate.

6.1 Throttling service

− The Type 3276 Pneumatic Actuator is de-
signed for a maximum supply pressure
of 80 psi (5.5 bar) when used for throt-
tling service.
− During normal operation, the handwheel
in actuator versions with a top-mounted
or side-mounted handwheel must be
placed in the neutral position to allow the
actuator to move through its entire travel
range in throttling or on/off service.
6.2 Manual mode (versions
with top-mounted or side-
mounted handwheel only)
In the manual mode, the valve is opened
and closed by the handwheel. The valve po-
sition is independent of the signal pressure
or actuator spring.
Operation
6-1