Madas RG/2MBLZ Manual Del Usuario página 15

• Close the vent valve;
• Proceed by manually resetting the regulator (see 4.0);
• Close the downstream valve so as to close the regulator (the P2 value increases the SG value to fully close the obturator);
• Check the tightness of the system seals and check the internal/external tightness of the regulator, of the relief valve and of
the external sensor tube, if applicable;
• Slowly open the downstream valve and the shut-off valve;
• Check the operation of the regulator.
6.0 - SETTING
Before carrying out the operations, make sure that the supplied spring/s is/are suitable for the desired P2 - 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. 1) 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 P2 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 P2 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 (P2).
Example: P2=32-60 mbar - DfRv=15-40 mbar.
Means that the relief valve can be calibrated from: (P2 min + DfRv min) = 32+15=47 mbar to: (P2 max + DfRv max) =
60+40=100 mbar
Therefore the effective range of the relief valve (in this case) is 47-100 mbar.
Madas Technical Manual - 4|4.2b - REV. 0 of 1
15
Apr 2019
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RG/2MBLZ