IT
EN
FR
ES
15
Madas Technical Manual
- 4|4.2b - REV. 0 of 1
st
Apr 2019
RG/2MBLZ
• 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.
