Mounting The Actuator On The Valve After Service Or Conversion Work; Service Work; Replacing The Diaphragm - Samson 3277-5 Mounting And Operating Instructions

Note
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 service and/or conversion
work can be performed after preparation is
completed:
− Replace the diaphragm (see sec-
tion 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 service or
conversion work
1. Mount the actuator (see the 'Installation'
section).
2. Adjust the upper or lower bench range
values (see the 'Start-up' section).
EB 8310-1 EN

9.4 Service work

See Fig. 9-1
9.4.1 Replacing the dia-
phragm
Tip
We recommend to also replace the actuator
stem seal on replacing the diaphragm. See
section 9.4.2.
a) Actuator stem extends
1. Lift off the top diaphragm case (A1) and
remove springs (A10).
2. Pull the actuator stem (A7) together with
the diaphragm plate (A5.1), diaphragm
(A4) and diaphragm plate (A5.2) out of
the bottom diaphragm case (A2).
3. Unscrew the collar nut (A15).
NOTICE
!
Malfunction due to loosened nut.
The nut (A9) on the actuator stem serves to
adjust the dimension a.
Î Do not undo the nut (A9).
Î If the nut has been loosened, readjust the
dimension a as specified in Table 9-1.
4. Remove the diaphragm plate (A5.1), di-
aphragm (A4) and diaphragm plate
(A5.2) from the actuator stem (A7).
5. Place the new diaphragm on the dia-
phragm plate (A5.2). Place on the other
diaphragm plate (A5.1).
Servicing and conversion
9-3