35
Fig. a
Fig. b
Fig. c
Fig. d
Resetting of the shut-off valve
The shut-off valve must be reset only after having
verifying the reason for the intervention and after
having re-established normal conditions of work,
proceeding as follows:
Resetting of the shut-off valve with screw reset
– close the downstream stop valve
– remove the cover 29, unscrewing it (fig.a)
– screw it upside down into the stem 28 until in
comes into contact with the cover (fig.b)
– continue to screw it slowly: with this operation
(by-pass) pressure fills the downstream pipe
part
– pull the cover outwards in order to permit the
seating of the balls on the stem: the shut-off
valve is reset (fig.c).
After these operations, screw the cover to it is
housing (fig.d) and slowly open the downstream
valve.
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