PIETRO FIORENTINI NORVAL, Инструкция по установке, пусконаладке и обслуживанию

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TECHNICAL MANUAL MT044
40
Procedure for the disassembly, complete replacement of the spare parts and
re-assembly of the NORVAL pressure
reg I-N (PROGRAMMED PREVENTIVE MAINTENANCE)
PRELIMINARY OPERATIONS
A. Render the regulator safe;
B. Ensure that the pressure upstream and downstream from it is 0.
C. Press the button to trip the slam-shut valve.
DISASSEMBLY
(The positions refer to fig. 18)
1) Slacken the fixing screws, pos. , in the bottom flange.
2) Remove the bottom flange, pos. .
3) Remove the gasket from the obturator, pos. , unscrewing the gasket support pos. , and acting with
a sharp blow.
4) Slacken the lock-nut, pos. .
5) Slacken the adjustment screw, pos. , until it comes out.
6) Unscrew and remove the spring-holder plug, pos. .
7) Remove the adjustment spring, pos. , along with the top spring support, pos. .
8) Slacken and remove the fixing screws, pos. .
9) Remove the top cover, pos. .
10) Keeping the diaphragm support, pos. , fixed, slacken the lock-nut, pos. . Remove it and then remove the
spring support, pos. , the diaphragm protection disc, pos. , the diaphragm, pos. , and the rubber
gasket, pos. .
11) Keeping the rod, pos. , fixed, remove the self-locking nut, pos. .
12) Remove the rod, pos. , from the bottom part of the regulator body.
13) Remove the diaphragm support, pos. , and the spacer, pos. .
14) Disconnect the sensing line which connects the bottom cover, pos. , to the downstream piping by
unscrewing the taper seal connections.
15) Slacken and remove the bottom cover fixing screws, pos. .
16) Remove the bottom cover, pos. .
17) Remove the bushing, pos. , the balancing diaphragm, pos. and the lock ring, pos. .
18) Remove the intermediate flange, pos. , along with the rod guide sleeve, pos. .
19) Remove the obturator support of the slam-shut valve, pos. , along with the spring, pos. , and the
obturator, pos. .
20) Check and clean the inside of the regulator body.
21) Carefully check that the valve seat, pos. , is in a good state, both with regard to the regulator seat and the
slam-shut seat.
22) Disconnect the sensing line which connects the pressure control of the slam-shut to the downstream piping,
unscrewing the taper seal connections.
45
1
4 3
44
74
23
41 22
47
24
18
50
27 26 20
28
8 49
8
18 17
19
46
19
16 29 15
14
13
12 42
10
7