Installation and Operation Manual
Urano - Pressure Regulating Valve
MI-31
Elaborado
Verificado / Aprovado
CSQ
Data
Revisão
Página
JJ
JJ
JM
05/07/21
05
32 de 74
15)
SLOW AND GRADUALLY
open the output shutoff valve to apply a load to the span.
16) If necessary, fine-tune the regulated pressure through the pilot regulation spring.
4.6.3 THE BACK-UP LINE SET-UP
When the regulator is installed in a back-up line, we recommend that the procedure given in 4.6.2 be
repeated, but this pressure regulator setpoint should be adjusted for a pressure 15% - 20% lower than
the set point of the valve in operation.
After doing so, open
SLOW AND GRADUALLY
the outlet shut-off valve so that the downstream
pressure of the back-up span regulator equalizes with the pressure already in operation. The back-up
regulator will remain shut.
To make the regulator of the reserve span assume regulation, slowly press the regulation spring
clockwise until the set point of the regulator reaches a value higher than the set point of the line in
operation, thus the reserve regulator will open slowly and assume operation.
It is important that the two regulators remain with a set point difference of at least 5% - 10%, so that
there is no set point overlap causing a competition between the two lines, i.e., at one instant one
regulator opens, at another instant the reserve regulator opens, promoting inaccuracy in regulation.
TABLE OF RECOMMENDED SET POINTS
MAIN
REGULATOR
SET POINT (PS)
BACK-UP
REGULATOR
SET POINT
PSV
SET POINT
SSV
SET POINT
2.5 - 5.0 bar
PS x 1.150
PS x 1.400
PS x 1.500
5.0 - 12.0 bar
PS x 1.050
PS x 1.200
PS x 1.300
12.0 - 20.0 bar
PS x 1.025
PS x 1.200
PS x 1.300
20.0 - 80.0 bar
PS x 1.025
PS x 1.150
PS x 1.250
Note: The values given in this table are recommended as the best practices, but it is not forbidden the
use different set point ranges upon review and approval by GASCAT.