Madas FRG-RG/2MCSH Manual De Instrucciones página 17

• 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
Therefore the effective range of the relief valve is: with Pa min it is 1.1 - 1.9 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).
Madas Technical Manual - 5|5.3a - REV. 1 of 20
(Pa max + DfRv min) = 1.5+0.2=1.7 bar to: (Pa max + DfRv max) = 1.5+1=2.5 bar
with Pa max it is 1.7 - 2.5 bar
17
Feb 2020
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FRG-RG/2MCSH - FRG/2MBH (Z/F/R/M)