Installation, Operation and Maintenance Manual
Pressure Regulating Valve – Model Ares N
MI–42
Prepared by
Verified by/ Approved by
CSQ
Date
Revision
Page
José Junior
Vanízio Lizo
Jamerson
24/03/17
02
13 of 21
4.5.2 COMMISSIONING (SINGLE REGULATOR SPAN)
Using, as a reference, the assembly scheme presented in item 4.5.1, proceed to the description on commissioning the
regulator model Ares N in a span of simple regulation, considering that the recommendations made in section 4.6.1 of this
manual have been properly observed.
1) Shut-off the vent valve.
As the line shut-off valves are closed, we will use the vent valve to simulate a small flow and so proceed with the
regulator adjustment before aligning the span.
2) Check if the regulator regulating spring is properly relieved (discharged).
Alleviating the regulating spring, we are ensuring that the valve will only admit a small pressure downstream of the
regulator, enough to pass the same to the closed position.
3) Press completely the regulation spring of the shut-off valve incorporated in model G-10 to ensure that the same
is in the high pressure trip position at the commissioning start. Reset the shutoff valve if it is disarmed.
4)
SLOW AND GRADUAL
open the inlet shut-off valve, or when the station is provided with a by-pass of the shut-
off valve use the same to perform pressurization.
5) In following, we will make the set point adjustment of the SSV model G-10. With a combined spanner wrench
13/16" turn the setscrew of the pressure regulator valve ARES N clockwise, to gradually raise the output
pressure to the desired set point for the SSV.
6) Slowly remove the load of the G-10 blocking valve regulating spring until the valve operates blocking the line.
7) Repeat steps 5 and 6 three times to verify the blocking repeatability and perform the fine-tune adjustment.
8) Once the shut-off is adjusted, perform the adjustment of the pressure regulator model ARES N, with the vent
valve and the shut-off valve of the main line still closed, by increasing the pressure to the desired set point for the
pressure regulator. However, as this is a static pressure adjustment, i.e., with no flow, we are actually adjusting
the regulator lock-up pressure, then proceed by raising the pressure to a value 20% higher than the desired
pressure for the set point under load, for cases in which shutting with 20% is desired.
Example: Desired set point: 0.35 – Shut-off adjustment: 0.35/0.8 = 0.43 bar
9) Slowly open the vent valve until the pressure reaches the desired set point.
10) Close the vent valve slowly and check the shutting pressure.
11) Repeat steps 9 and 10 three times to verify the shutting repeatability and, if necessary, perform the set-up fine-
tuning.
12) Check for leaks in connectors and other pressure regulator connections of the span.
13) Once the shut-off valve and the regulator are set, proceed with the alignment of the span by
SLOW AND
GRADUAL
opening of the outlet shutoff valve.
14) Note the accuracy of the set pressure, if the output pressure reaches a value below the adjusted pressure with
the outlet shutoff valve closed, probably the consumption (flow rate) is larger than the regulator capacity, in this
case it is necessary to check the equipment sizing, or if the operating conditions informed for design are
respected.