Madas FRG-RG/2MCSH Manual De Instrucciones página 18

6.4 - Adjusting the outlet pressure (Pa)
The outlet pressure Pa (unless specifically requested) is factory-set with the regulator installed as indicated in 3.4 and with
the adjustment screw (1) set approximately at the minimum setting value. The safety shut offs/relief valve are set accordingly;
If the regulator is installed in different positions, check and reset the outlet pressure Pa, and consequently the devices
incorporated in the regulator;
Adjust the outlet pressure as follows:
• Unscrew the cap (27);
• Unscrew the adjustment screw (1) and set it to the minimum setting allowed (threaded end of the top cover (3));
• Start the system or make sure there is a minimum flow downstream of the regulator;
• To increase the pressure setting downstream of the regulator, tighten the adjustment screw (1) to the desired value. Perform
the reading with a calibrated pressure gauge, installed downstream of the regulator to at least 5 DN (see example in 3.4);
• Screw the cap (27) back on and if necessary, seal it in that position using the appropriate seal holes (if any);
• Use pressure outlets (24) on the device only for zero flow or very low flow measurements.
7.0 - RECOMMENDED PERIODIC CHECKS
• Use a suitable calibrated tool to ensure that the bolts are tightened as indicated in 3.2;
• Check the tightness of the flanged/threaded connections on the system;
• Check the tightness and operation of the regulator/shut off/relief valve;
The final user or installer is responsible for defining the frequency of these checks based on the severity of the service conditions.
7.1 - CHECK THAT THE MAXIMUM PRESSURE SHUT OFF VALVE IS WORKING
(OPSO - FRG/2MBH... models)
• Reset the shut off device and close the valve downstream of the regulator;
• Use an auxiliary gas pressure to slowly increase the downstream pressure until the device is triggered (so as to avoid having
to set the Pa again).
7.2 - CHECK THAT THE MINIMUM PRESSURE SHUT OFF VALVE IS WORKING
(OPSO - FRG/2MBH... models)
• Reset the shut off device and close the ball valve upstream of the regulator;
• open the relief valve, downstream of the device, partially and slowly. As the outlet pressure decreases slowly it will cause the
minimum shut off to trigger at its setting value;
• Repeat the trigger step 2-3 times to make sure that the system functions correctly. Between one trigger and another, set the
downstream pressure back to the setting value.
7.3 - CHECK THE TIGHTNESS OF THE DEVICES (OPSO AND UPSO - FRG/2MBH... versions)
• Fully empty the downstream pipe section (wait a few seconds to allow it to empty completely). The downstream pressure
must remain at zero when the relief valve is closed.
7.4 - CHECK THAT THE RELIEF VALVE IS WORKING PROPERLY
• 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 an 8 mm socket spanner to press the adjustment nut (21) to increase the pressure Pa above the preset value, while
preventing the OPSO shut off from being triggered. Use a calibrated pressure gauge for the reading;
• Remove the socket spanner. The generated overpressure will be discharged outwards and the Pa will begin to decrease to
the relief valve setting value. Relief valve operation is verified;
• Close the cap (27);
• Open the relief valve to discharge the created overpressure;
• Close the relief valve (the regulator goes to the closing pressure) and open the ball valve downstream of the regulator.
FRG-RG/2MCSH - FRG/2MBH (Z/F/R/M)
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Madas Technical Manual - 5|5.3a - REV. 1 of 20 Feb 2020
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