PIETRO FIORENTINI NORVAL, Installation, Commisioning And Maintenance Instructions

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TECHNICAL MANUAL MT044
RE-ASSEMBLY
Remembering that the O-rings and the sliding parts (rods, etc.) must be lightly lubricated with a fine layer of
silicone grease before re-assembly, while static parts require grease to render them softer but, especially, to
hold them in their slots:
22) Fit back the intermediate flange, pos. , along with the rod guide sleeve, pos. .
23) Put back the lock ring, pos. , the balancing diaphragm, pos. , and the bushing, pos. .
24) Put the bottom cover, pos. , back in its original position with the sensing line take-off turned towards
the downstream piping, and fix the screws, pos. .
25) Reconnect the sensing line which connects the bottom cover, pos. , to the downstream piping,
repositioning it and fixing the taper seal connections.
26) Fit the spacer, pos. , and the diaphragm support, pos. .
27) Put the rod, pos. , back on the bottom part of the regulator body, and screw in the self-locking nut,
pos. .
28) Keeping the rod, pos. , fixed, fully tighten the self-locking nut, pos. .
29) Proceeding slowly, carry out vertical movements of the top of the rod to check that it moves properly.
30) Reassemble the gasket, pos. , the diaphragm, pos. , the diaphragm protection disc, pos.
and the spring support, pos. , and screw in the lock-nut, pos. .
31) Check that the holes in the diaphragm and bottom cover match and, keeping the diaphragm support fixed,
tighten the lock-nut, pos. .
32) Check once again that the holes in the diaphragm and bottom cover line up properly.
33) Put the top cover back into its original position with the anti-pumping valve towards the downstream side.
34) Put back and fix the screws, pos. , with a torque of 5 KG.M.
35) Put back the regulation spring, pos. , with the top spring cover, pos. .
36) Screw the spring-holder plug, pos. , as far as it goes.
37) Put back the obturator gasket, pos. , with the gasket support, pos. , as far as it goes.
38) Fix the above with a sharp blow.
39) Put back the bottom flange, pos. by means of the fixing screws, pos. .
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14 13
15
29 16
19
46
19
17
18
8
49
8
49
28 20 26
27
50
50
47
41
22
23
4
3
1
45