DRESSER RB 4000 Betriebsanleitung Seite 8

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-estab-
lished normal conditions of work, proceeding as follows:
8
28 29
Fig . a
Fig . c
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 .
Fig . b
Fig . d