TECHNICAL MANUAL MT103
34
5.4
COMMISSIONING THE REGULATOR WITH INCORPORATED PM/819 MONITOR AND
ACCELERATING VALVE (FIG. 23)
If there is also a relief valve in the line, refer to par. 3.1 to check it.
1) Partially open the bleed cock 6.
2) Very slowly open the inlet on/off valve V1.
3) Completely increase the set-point of the pilot 3 of the main regulator by turning the adjustment screw 10
clockwise (fig. 2);
4) Completely increase the setting of the accelerating valve by turning the adjustment screw 17 (fig. 7) clockwise;
5) Adjust the setting of the monitor pilot 10 to the intervention value established for the accelerating valve 12;
6) Reduce the setting of the accelerating valve 12 until, using a foaming agent, gas is seen to be released from
the provided vent;
7) Reduce the setting of the pilot 10 to the selected working value for the monitor, and ensure that the valve 12
has stopped the release of the gas;
8) Adjust the setting of the monitor pilot 10 to the set-point;
9) Reduce the setting of the pilot 3 to the selected working value for the service regulator;
10) Check that the PM/819 monitor is fully open by controlling the position of the indicator through the window;
11) Close the bleed cock 6 and check that the downstream pressure, after increasing, settles at a value slighth higher
than that of closure of the pilot/monitor assembly. If it does not, remedy the causes of the internal leakage;
12) Using a foaming agent, check the tightness of all the joints between the on/off valves V1 and V2.
13) Very slowly open the downstream on/off valve V2 until the line is completely filled. If, at the beginning of this
operation, the pressure in the line is much lower than the set-point, the opening of this valve should be choked
so as not to exceed the maximum flow rate value of the installation.
Fig. 23
Fig. 23/A
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