Type B/240
8
i. Check diaphragm and if worn or damaged, dismount the
diaphragm unit and replace it.
unscrew register nut (key 4) and then remove spring
(key 6).
In the models fitted with relief valve take care to mark the
height of the preloaded spring in order to reassemble it
in its original position, thus ensuring proper setting of the
relief valve.
j. Check O-ring (key 17 and 24).
relatching unit maintenance
(if installed)
a. Trigger actuator and remove impulse line (A).
b. Loosen dowels (G) and remove OS/66 actuator.
c. Remove plug (key 29) from regulator and check stem
(key 28); if worn or damaged, dismount the pad holder
(key 33) and replace the stem.
d. Carefully clean and check all components, replacing
those worn out.
See the Instruction Manual 0048EN-OS66-IM for the
slam-shut controller maintenance.
reassembling
Lubricate all seals with “MOLYKOTE 55 M” and be very
careful not to damage them when reassembling.
Reassemble by reversing the above steps.
As you proceed, make sure that parts move freely and
without friction.
In addition:
a. Diaphragm unit (key. 14), is properly reassembled by
lubricating it with some grease and by carefully fitting it
into the servomotor body (key. 44).
b. All screws are duly tightened in order to ensure proper
sealing.
c. If installed check the correct relatching of the slam-shut
controller (see Startup item b).
d. Check for leaks using suds.
SParE ParTS
Spare parts storage shall be done by proper procedures
according to national standard/rules to avoid over aging or
any damage.
TrOuBLEShOOTING
Table 3.
General Troubleshooting for B/240 Series
SymPTOmS
CauSE
aCTIONS
The regulator does not open
Lack of incoming gas
Check the station feeding
The slam-shut controller has not been reset
Manually reset the slam-shut controller
Drop in pressure downstream from the regulator
Insufficient upstream pressure
Check the station feeding
Flow requirements higher than the flow
that the regulator can supply
Check the regulator sizing
Filter upstream is obstructed
Clean or replace it
Increase in pressure downstream from the regulator
or safety devices being activated
(relief valve or slam-shut valve)
Tight shutoff gaskets are worn
To be replaced
Deposits of grime on the tight shutoff pad are
obstructing proper positioning of the shutter
Clean or replace it
Diaphragm damaged
To be replaced
Slam-shut device does not execute tight
shutoff procedure
O-ring and/or slam-shut pad worn
To be replaced
Slam-shut seat damaged
To be replaced
