Samson 3271, Оригинальное руководство пользователя, Страница: 45 / 72

EB 8310-6 EN 9-3
Service and conversion work
To remove an actuator with "stem extends"
fail-safe action and/or with preloaded
springs, a certain signal pressure must be
applied to the actuator (see the 'Removal'
section). Afterwards, the signal pressure
must be removed and the air supply discon-
nected again and locked.
4. Relieve the compression from the pre-
loaded springs. See 'Relieving the spring
compression in the actuator' in the 'Re-
moval' section.
5. Unthread and remove the nuts and bolts
(including the washers) from around the
actuator casing.
The following servicing and/or conversion
work can be performed after preparation is
completed:
− Replace the diaphragm (see section 9.4.1)
− Replace the actuator stem seals (see sec-
tion 9.4.2)
− Reverse the direction of action (see sec-
tion 9.5.1)
9.3 Mounting the actuator on
the valve after servicing or
conversion work
1. Mount the actuator (see the 'Mounting
and assembly' section).
2. Adjust the upper or lower bench range
values (see the 'Start-up' section).
9.4 Service work
See Fig. 3-1 and Fig. 3-2 in the 'Design and
principle of operation' section
9.4.1 Replacing the dia -
phragm
Risk of malfunction due to damaged hose
clamp.
Î
Do not reuse hose clamps.
Î
Use a new hose clamp every time the
diaphragm is replaced.
Risk of property damage and malfunction
due to incorrect mounting of the hose
clamp.
Î
Tighten the hose clamp by hand using a
torque wrench. Observe the tightening
torque and position it centrically.
a) Version with direction of ac -
tion "actuator stem extends"
Refer to Fig. 9-1
1. Lift off the top diaphragm case (A1) and
remove springs (A10).
2. Pull the diaphragm plate assembly con-
sisting of the diaphragm plate (A5), dia-
phragm (A4) and actuator stem (A7) out
of the bottom diaphragm case (A2).
3. Clamp the bottom section of the actuator
stem (A7) into a vise using protective
Note
NOTICE !
NOTICE !