13
TECHNICAL MANUAL ICM
3L.P. GAS s.r.l.
Fig. 12
Procedure for disassembly. complete replace-
ment of the spare parts and reassembly of the
ICN slam-shut valve (PROGRAMMED PREVENTI-
VE MAINTENANCE)
PRELIMINARY OPERATIONS
A.
Render the valve safe;
B.
Ensure that the pressure upstream and
downstream from it is 0.
DISASSEMBLY
(The position refer to Fig. 11-12)
1) Slacken and remove the fixing screws, pos. 46, in
the flange slam-shut valve, pos. 14.
2) Remove the flange slam-shut valve pos. 14.
3) Remove the obturator support of the slam-shut
valve, pos. 12, along with the spring, pos. 42, and
the obturator, pos. 10.
4) Check and clean the inside of the valve body.
5) Carefully check that the valve seat, pos. 7, is in a
good state.
6) Disconnect the sensing line which connects the
pressure control of the slam-shut to the downstream
piping, unscrewing the taper seal connections.
7) Slacken the fixing screws, pos. 42, of the slam-
shut cover, pos. 17.
8) Remove the slam-shut cover, pos. 36.
9) Remove the retaining ring, pos. 52, which fixes the
reset lever, pos. 36.
10) Remove the reset lever, pos. 36.
11) Remove the retaining ring, pos. 42.
12) Slacken and unscrew the screws, pos. 40.
13) Remove the pressure control from the value body.
14) Unscrew and remove the shaft guide, pos. 33.
15)
Replace all the components included in the
spare parts list.
