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18
Madas Technical Manual - 5|5.2a - REV. 0 of
th
Apr 2019RG/2MCS - RG/2MBZ
6.4 - Adjusting the outlet pressure (Pa)
The outlet pressure Pa (unless specifically requested) is factory-set with the regulator installed as indicated in 3.4 and with
the adjustment screw (1) set approximately at the minimum setting value. The safety shut offs/relief valve are set accordingly;
If the regulator is installed in different positions, check and reset the outlet pressure Pa, and consequently the devices
incorporated in the regulator;
Adjust the outlet pressure as follows:
• Unscrew the cap (26);
• Unscrew the adjustment screw (1) and set it to the minimum setting allowed (threaded end of the top cover (25))
;
• Start the system or make sure there is a minimum flow downstream of the regulator;
• To increase the pressure calibration downstream of the regulator, tighten the adjustment screw (1) to the desired value.
Perform the reading with a calibrated pressure gauge, installed downstream of the regulator to at least 5 DN (see examples
in 3.4);
• Screw the cap (26) back on and if necessary, seal it in that position using the appropriate seal holes (if any);
• Use pressure outlets (19)on the device only for zero flow or very low flow measurements.
7.0 - RECOMMENDED PERIODIC CHECKS
• Use a suitable calibrated tool to ensure that the bolts are tightened as indicated in 3.2;
• Check the tightness of the flanged/threaded connections on the system;
• Check the tightness and operation of the regulator/shut off/relief valve;
The final user or installer is responsible for defining the frequency of these checks based on the severity of the service conditions.
7.1 - CHECK THAT THE MAXIMUM PRESSURE SHUT OFF VALVE IS WORKING (OPSO)
Reset the shut off device and close the valve downstream of the regulator;
Method 1:
1. Loosen and remove caps (26) and (11 );
2. Use the same tool (shown in fig. 1 and 2) to press the nut (4) and slowly increase the downstream pressure until the
device is triggered;
3. Tighten the caps back to their original position and repeat the Pa setting steps (6.4);
Method 2:
1. Alternatively, use an auxiliary gas pressure to slowly increase the downstream pressure until the device is triggered
(so as to avoid having to set the Pa again).
7.2 - CHECK THAT THE MINIMUM PRESSURE SHUT OFF VALVE IS WORKING (UPSO)
• Reset the shut off device and close the ball valve upstream of the regulator;
• open the relief valve, downstream of the device, partially and slowly. As the outlet pressure decreases slowly it will cause the
minimum shut off to trigger at its setting value;
• Repeat the trigger step 2-3 times to make sure that the system functions correctly. Between one trigger and another, set the
downstream pressure back to the setting value.
7.3 - CHECK THE TIGHTNESS OF THE DEVICES (OPSO AND UPSO)
• Fully empty the downstream pipe section (wait a few seconds to allow it to empty completely). The downstream pressure
must remain at zero when the relief valve is closed.
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