Dresser RB 1700, Installation And Starting Instructions

Page: 7 / 24

7
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
W
ds 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
adjustment screw (a) clockwise - see Fig 2
Relatching the SSV -
see Fig 3
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 downstream
pipe
On RB 1800 / RB 1800F - this causes the
internal by-pass to open When the outlet
pressure has stabilized,
•
c - pull the stem and cover outwards to re-
latch the trip mechanism The stem shall
remain in ãopen“ 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
already set to the specifications indicated in
the order sheet
Whenever the set value of the trip pressure
p dso for over-pressure (and/or p dsu for
under-pressure must be modified, this value
must be set within the set range W dso (and/
or W dsu) of the spring installed
Do not modify the set value when the SSV
controller is not under pressure
• To increase the set value: rotate clockwise
the adjustment screw (b) for upper trip
pressure or the adjustment screw (c) for
lower trip pressure - see Fig 2.