PIETRO FIORENTINI NORVAL, Инструкция по установке, пусконаладке и обслуживанию

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TECHNICAL MANUAL MT044
44
Procedure for the disassembly, complete replacement of the spare parts and
re-assembly of the NORVAL pressure
reg I-N + ER (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 position refers to fig. 19)
1) Disconnect the sensing line which connects the monitor to the downstream piping, unscrewing the taper seal
connections.
2) Slacken the fixing screws, pos. , in the bottom flange.
3) Remove the bottom flange, pos. .
4) Unscrew the nut, pos. , and with a blow remove the protection disc, pos. , the balancing diaphragm,
pos. , the lock ring, pos. and the locking flange, pos. .
5) Unscrew the balancing rod, pos. , with a sharp blow.
6) Remove the reinforced gasket, pos. , unscrewing the gasket support, pos. , with a sharp blow.
7) Slacken the lock-nut, pos. .
8) Slacken the adjustment screw, pos. , until it comes out.
9) Unscrew and remove the spring-holder plug, pos. .
10) Remove the adjustment spring, pos. , along with the top spring support, pos. .
11) Slacken and remove the fixing screws, pos. .
12) Remove the top cover, pos. .
13) 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. .
14) Keeping the rod, pos. , fixed, remove the self-locking nut, pos. .
15) Remove the rod, pos. , from the bottom part of the regulator body.
16) Remove the diaphragm support, pos. , and the spacer, pos. .
17) Disconnect the sensing line which connects the bottom cover, pos. , to the downstream piping by
unscrewing the taper seal connections.
18) Slacken and remove the bottom cover fixing screws, pos. .
19) Remove the bottom cover, pos. .
20) Remove the bushing, pos. , the balancing diaphragm, pos. and the lock ring, pos. .
21) Remove the intermediate flange, pos. , along with the rod guide sleeve, pos. .
50
1
49
11
15 38
37
4 3
44
74
23
41 22
47
24
18
50
27
29
26
20
28
8
49
8
18
17
19
46
19
16 29
15
14 13