DRESSER RB 1700 Instrucciones De Instalación página 8

Pressure Regulator Setting
The pressure regulator is usually delivered already
set to the specifications indicated in the order sheet
Whenever the set pressure must be modified, this
value must be set within the setting range Wds of
the spring installed
Make sure there is a flow demand or open the vent
valve downstream of the regulator The vent valve
should be closed after the desired set pressure is
obtained
• To increase the set pressure: rotate the adjust-
ment screw (a) clockwise - see Fig 2
Relatching the SSV -
The safety shut-off valve must be re-latch only after
verifying the reasons for the SSV to trip and after
having re-establish normal operating conditions
Before re-latching the safety slam-shut valve, make
sure that the downstream valve is closed
• a - unscrew cover (bb) to remove it;
• b - screw it upside down on the stem (aa) until it
comes into contact with the controller top casing;
continue to screw it slowly, this causes the valve
to open gently and the pressure to fill the down-
stream pipe
8
see Fig 3
On RB 1800 / RB 1800F - this causes the internal by-
pass to open When the outlet pressure has stabi-
lized,
• c - pull the stem and cover outwards to re-latch
the trip mechanism The stem shall remain in ão-
pen" position;
• d - unscrew the cover and replace it in operation
position on the controller top casing
Setting the SSV
The safety slam-shut valve is usually delivered al-
ready set to the specifications indicated in the order
sheet
Whenever the set value of the trip pressure pdso
for over-pressure (and/or pdsu for under-pressure
must be modified, this value must be set within
the set range Wdso (and/or Wdsu) of the spring in-
stalled
Do not modify the set value when the SSV control-
ler is not under pressure
• To increase the set value: rotate clockwise the ad-
justment screw (b) for upper trip pressure or the
adjustment screw (c) for lower trip pressure - see
Fig 2.