Replacing The Operating Diaphragm - Samson 2488/5 Series Mounting And Operating Instructions

Servicing
7.4 Replacing the operating
diaphragm
Î See Fig. 3
NOTICE
!
Risk of regulator damage due to excessively
high or low tightening torques.
Observe the specified torques on tightening
regulator components. Excessively tightened
torques lead to parts wearing out quicker.
Parts that are too loose may cause leakage.
Observe the specified tightening torques.
Note
SAMSON's After-sales Service can support
you concerning lubricant, tightening torques
and tools approved by SAMSON.
Note
The stem surface is roller-burnished. Do not
reface the stem.
After replacing the diaphragm stem, the nip-
ple (guide bushing) in the actuator case must
be replaced as well.
Tip
The associated order number is written on
the actual rolling diaphragm.
44
Removal
1. Put the regulator out of operation (see
section 9.1).
2. Unscrew the control line (7).
3. Unscrew the screws (6.2). Remove the di-
aphragm case (6.3) together with the op-
erating diaphragm with diaphragm plate
(6.1).
Mounting
Note
Before refastening the actuator, make sure
that the operating diaphragm has been in-
serted properly into the ring groove.
1. Check the facings of the valve body (1)
and the diaphragm case (6.3) for dirt
and clean them, if necessary.
2. Place the operating diaphragm (6.1) and
diaphragm case (6.3) onto the valve
body (1).
3. Tighten the screws in a crisscross pattern.
Observe the tightening torques specified
in section 7.5.
4. Screw on the control line (7). Observe
the tightening torques specified in sec-
tion 7.5.
5. Install the regulator into the pipeline.
6. Fasten the electric actuator (10) using the
coupling nut (10.2) to the connecting
piece (8) of the valve. Observe the tight-
ening torques specified in section 7.5.
7. Connect the supply voltage to the electric
actuator (see section 6.1.1).
8. Put the regulator into operation (see sec-
tion 6).
EB 3135-1 EN