DRESSER RB 4700 Manuel D'instructions page 28

Resetting of the shut-off valve
The shut-off valve must be reset only after having ver-
ifying 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)
28
Fig. a
Fig. c
– 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.
Fig. d
Fig. b