IT
EN
FR
ES
17
Madas Technical Manual
- 5|5.4a - REV. 0 of 2
th
Sep 2019
FRG-RG/2MCSH - FRG/2MBH (Z/F/R/M)
• Close the downstream valve so as to close the regulator (the Pa 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 Pa - OPSO - UPSO and
differential relief valve fields.
6.1 - Adjusting the maximum pressure shut off (OPSO - FRG/2MBH... models)
• Unscrew the cap (
10
);
• Use the supplied key (
28
) to fully tighten the adjustment ring nut of the maximum shut off (
16
);
• 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 (
28
) to loosen the ring nut (
16
) until the device is triggered (so as to avoid having to set the Pa again);
• 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 (
16
) with the specific key (
28
).
6.2 - Adjusting the minimum pressure shut off (UPSO - FRG/2MBH... models)
• Unscrew the cap (
10
);
• Use the supplied key (
28
) to loosen the adjustment ring nut of the minimum shut off (
17
) 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 (
28
) to tighten the adjustment ring nut (
17
) 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 (
17
) with the specific key (
28
);
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=0.9
-
1.5 bar - DfRv=0.2
-
1 bar.
Means that the relief valve can be calibrated from: (Pa min + DfRv min) = 0.9+0.2=1.1 bar to: (Pa min + DfRv max) = 0.9+1=1.9 bar
(Pa max + DfRv min) = 1.5+0.2=1.7 bar to: (Pa max + DfRv max) = 1.5+1=2.5 bar
Therefore the effective range of the relief valve is: with Pa min it is 1.1
-
1.9 bar
with Pa max it is 1.7
-
2.5 bar
• 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 (
27
);
• Use the 8 mm socket spanner (see fig. 1 and 2b) to fully tighten the nut (
21
);
• Use the 8 mm socket spanner to press the adjustment nut (
21
) 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 (
21
) 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 (
27
).