Samson 2780-1, Mounting And Operating Instructions, Page: 31 / 52

EB 5840 EN 8-1
Servicing and conversion work
8 Servicing and conversion
work
The work described in this section is only to
be performed by personnel qualified for the
assignment accordingly.
The following documents are also necessary
for servicing the valve:
−
u
AB 0100 for tools, tightening torques
and lubricant
Risk of bursting due to incorrect opening of
pressurized equipment or components.
Pneumatic actuators are pressure equipment
that may burst when handled incorrectly.
Flying projectile fragments or components
can cause serious injury or even death.
Before working on the actuator:
Î
Depressurize all plant sections concerned
and the actuator. Release any stored en‑
ergy.
Risk of personal injury due to preloaded
springs.
Actuators with preloaded springs are under
tension. These actuators are marked accord‑
ingly by an adhesive label. Additionally,
they can be identified by the longer bolts
with nuts protruding from the bottom dia‑
phragm case. They allow the spring com‑
pression to be relieved evenly on disassem‑
bling the actuator.
Î
Only open the actuator following the in‑
structions in this document. See 'Reliev‑
ing the spring compression in the actua‑
tor' in the 'Removal' section.
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.
Crush hazard arising from the moving actu-
ator 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.
DANGER !
WARNING !
WARNING ! WARNING !
WARNING ! WARNING !