TECHNICAL MANUAL MT103
42
6.3
Tab. 12 SB/82 SLAM-SHUT (FIG. 31)
PROBLEM
POSSIBLE CAUSES
REMEDY
Slam-shut obturator
Control head diaphragm [4] broker
Change diaphragm
does not close
Leakage from
Seal of obturator [40] deteriorated
Change seal
slam-shut obturator
Seat of obturator deteriorated
Change the seat
Seal by-pass deteriorated
Change seal
Incorrect intervention
Wrong max. and/or min. spring setting
Make the setting again by means of the rings
pressure
Friction in the lever mechanism
Change the box containing the whole assembly
Persistence of the cause of the increase or
Decrease or increase the downstream pressure
Resetting not possible
decrease of the downstream pres.
Lever mechanism broken or cracked
Change the standard box containing the
assembly outside the regulator
N
.B.
If the slam-shut has intervened, close the inlet and outlet valve (
V1
and
V2
) on the line and discharge the
pressure before carrying out any operation.
Eliminate the causes which gave rise to intervention before reactivating it.
In the event of operating problems when personnel qualified for a specific operation are not available, call the
service centre nearest to you. For further information contact our SATRI service centre at our Arcugnano (VI)
works.
| [email protected] | Phone: 877.566.3837 | Fax: 925.407.2903