ES
FR
EN
IT
18
Madas Technical Manual
- 4|4.2c - REV. 0 of 10
th
Sep 2019
RG/2MBLZ
• To increase the pressure calibration downstream of the regulator, tighten the adjustment screw (
2
) 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);
• If it has been removed, screw the cap (
1
) back on and if necessary, seal it in that position using the appropriate seal holes
(if any);
• Use pressure outlets (
12
) on the device only for zero flow or very low flow measurements.
6.2 - Adjusting the minimum pressure shut off (UPSO)
NOTE
: to act on the UPSO adjustment screw (
26
), it is necessary to remove (by loosening it) the reset pin (
25
) and then
tighten it again to reset the device.
• Unscrew the cap (
23
);
• Use the supplied key (
29
) to loosen the adjustment ring nut of the minimum shut off (
26
) 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 supplied key (
29
) to tighten the adjustment ring nut (
26
) 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 (
26
) with the specific key (
29
);
6.3 - Adjusting the maximum pressure shut off (OPSO)
• Unscrew the cap (
23
);
• Use the supplied key (
29
) to fully tighten the adjustment ring nut of the maximum shut off (
24
). To do this, if necessary,
remove (by loosening it) the reset pin (
25
)*;
• 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);
• Use an auxiliary gas pressure to slowly increase the downstream pressure to the desired value and simultaneously, use the
key supplied (
29
) to loosen the ring nut (
24
) 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 (
24
) with the specific key (
29
).
* It must be tightened again in the original position to reset the device.
6.4 - 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.
• 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 (
1
);
• Use the appropriate socket spanner (see fig. 1) tighten the nut to stroke end (
19
);
• Use the 10 mm socket spanner to press the adjustment nut (
19
) and increase the pressure P2, reading it on the pressure
gauge, up to the desired setting value;
• Without pressing further, slowly loosen the adjustment nut (
19
) until the pressure P2 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 (
1
).
