PIETRO FIORENTINI NORVAL, Installation, Commisioning And Maintenance Instructions

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TECHNICAL MANUAL MT044
51) Keeping the rod, pos. , fixed, fully tighten the self-locking nut, pos. .
52) Proceeding slowly, carry out vertical movements of the top of the rod to check that it moves
properly.
53) Reassemble the gasket, pos. , the diaphragm, pos. , the diaphragm protection disc, pos. , and
the spring support, pos. , and screw in the lock-nut, pos. .
54) Check that the holes in the diaphragm and bottom cover match and, keeping the diaphragm support fixed,
tighten the lock-nut, pos. .
55) Check once again that the holes in the diaphragm and bottom cover line up properly.
56) Put the top cover back into its original position with the anti-pumping valve at the downstream side.
57) Put back and fix the screws, pos. , with a torque of 5 KG.M.
58) Put back the regulation spring, pos. , with the top spring cover, pos. .
59) Screw the spring-holder plug, pos. , as far as it goes.
60) Put back the obturator gasket, pos. , screwing in the gasket support, pos. , manually as far as it
goes.
61) Fix it with a sharp blow.
62) Reassemble the balancing rod, pos. , and fix it with a sharp blow.
63) Fit back the locking flange, pos. , together with the lock ring, pos. , the balancing diaphragm,
pos. , and the protection disc, pos. , and fix the whole assembly by means of the nut, pos. ,
with a sharp blow.
64) Put back the bottom flange, pos. by means of the fixing screws, pos. .
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27 50
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23
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38
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11
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