Mounting The Actuator Onto The Valve - Samson 3372 Mounting And Operating Instructions

Mounting and assembly
WARNING WARNING
! !
Crush hazard arising from the moving actu-
ator stem.
Î Do not touch the actuator stem or 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
seizing up after remaining in the same
position for a long time), release any
stored energy in the actuator (e.g. spring
compression). See 'Relieving the spring
compression in the actuator' in the
'Removal' section.
NOTICE
!
Risk of actuator damage due to excessively
high or low tightening torques.
Observe the specified torques on tightening
actuator components. Excessively tightened
torques lead to parts wearing out quicker.
Parts that are not tightened far enough may
loosen.
Î Observe the specified tightening torques
(u AB 0100).
5-2
NOTICE
!
Risk of actuator damage due to the use of
unsuitable tools.
Î Only use tools approved by SAMSON
(u AB 0100).
5.2.1 Mounting the actuator
onto the valve
To mount the actuator on the valve, proceed
as follows:
Tip
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).
See Fig. 5-1
1. Connect the air supply (see sec-
tion 5.2.2).
2. Connect the electrical power supply (see
section 5.2.3).
3. Move the actuator stem to its correct po-
sition:
"Stem extends" fail-safe action: apply a
signal pressure to actuators to retract the
actuator stem. If no signal pressure or
electric control signal is available during
the mounting procedure, tighten the hex
nut (6) against the force of the preloaded
springs using a hexagonal wrench with
width across flats (SW 36).
EB 8313-1 EN