Madas RG/2MCS Manuel Technique page 17

6.0 - SETTING
Before carrying out the operations, make sure that the supplied spring/s is/are suitable for the desired Pa - OPSO - UPSO and
differential relief valve fields.
6.1 - Adjusting the maximum pressure shut off (OPSO)
• Unscrew the cap (11);
• Use the supplied key (32) to fully tighten the adjustment ring nut of the maximum shut off (28);
• Start the system, reset the shut off device as indicated in 4.0 and make sure that there is no gas consumption (close the
applications downstream of the regulator);
Method 1:
1. Loosen and remove caps (26) and (11);
2. Use an 8 mm socket wrench (see fig. 1a and 2a) to press on the nut (4), slowly increasing the downstream pressure
to the desired value and simultaneously keep the nut (4) pressed; use the key supplied (32) to loosen the ring nut
(28) until the device is triggered;
3. Tighten the caps back to their original position and repeat the Pa setting steps;
Method 2:
1. Alternatively, use an auxiliary gas pressure to slowly increase the downstream pressure to the desired value and
simultaneously, use the key supplied (32) to loosen the ring nut (28) until the device is triggered (so as to avoid
having to set the Pa again);
• In both cases, reset the system by following the correct procedure and verify that the trigger value is that desired by repeating
the release step 2-3 times;
• If necessary, adjust the trigger value by turning the ring nut (28) with the specific key (32).
6.2 - Adjusting the minimum pressure shut off (UPSO)
• Unscrew the cap (11);
• Use the key supplied (32) to loosen the adjustment ring nut of the minimum shut off (30) to the minimum;
• Start the system and reset the shut off device as described in 4.0;
• Reduce the downstream pressure to the desired trigger value;
• Use the key supplied (32) to tighten the adjustment ring nut (30) until the minimum pressure shut off is triggered.
• Reset the system by following the correct procedure and verify that the trigger value is that desired by repeating the release
step 2-3 times;
• If necessary, adjust the trigger value by turning the ring nut (30) with the specific key (32);
6.3 - Adjusting the relief valve (differential DfRv)
NOTE: The relief valve (if any) in these regulators is differential, therefore the range value (DfRv) indicated must be added to
the range value of the outlet pressure (Pa).
Example: Pa=32-60 mbar - DfRv=15-40 mbar.
Means that the relief valve can be calibrated from: (Pa min + DfRv min) = 32+15=47 mbar to: (Pa max + DfRv max) =
60+40=100 mbar
Therefore the effective range of the relief valve (in this case) is 47-100 mbar.
• Start the system and set the shut off as described in point 4.0;
• Slowly close the valve downstream of the regulator;
• Loosen and remove the cap (26);
• Use the 8 mm socket spanner (see fig. 1 and 2) to fully tighten the nut (4);
• Use the 8 mm socket spanner to press the adjustment nut (4) and increase the pressure Pa, reading it on the pressure gauge,
up to the desired setting value;
• Without pressing further, slowly loosen the adjustment nut (4) until the pressure Pa begins to decrease, shown on the
pressure gauge;
• In this case, the relief valve is set to the desired value;
• Remove the socket spanner and close the cap (26).
Madas Technical Manual - 5|5.2a - REV. 0 of 5
17
Apr 2019
th
RG/2MCS - RG/2MBZ