Madas RG/2MCSH Manual Del Usuario página 18

6.4 - Adjusting the outlet pressure (Pa)
The outlet pressure Pa (unless specifically requested) is factory-set with the regulator installed as in 3.4 and with the
adjustment screw (1) set approximately at the minimum setting value. The safety shut offs/relief are set accordingly;
If the regulator is installed in different positions, check and reset the outlet pressure Pa, and consequently the devices built
into 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
reading with 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 the pressure test nipples (23) 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 - CHECKING OPERATION OF THE RELIEF PRESSURE SHUT OFF VALVE
(OPSO - RG/2MBHZ... 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 - CHECKING OPERATION OF THE MINIMUM PRESSURE SHUT OFF VALVE
(UPSO - RG/2MBHZ... models)
• Reset the shut off device and close the ball valve upstream of the regulator;
• Partially and slowly open the relief valve downstream of the device. As the outlet pressure decreases slowly it will cause the
minimum shut off to trigger at its calibration setting;
• Repeat the trigger operations 2-3 times to make sure that the system works correctly. Between operations, set the downstream
pressure back to the calibration setting.
7.3 - CHECK THE TIGHTNESS OF THE SAFETY DEVICES (OPSO AND UPSO - RG/2MBHZ... versions)
• Completely 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 - CHECKING OPERATION OF THE RELIEF VALVE
• Start the system and set the shut off as described in point 4.0;
• Slowly close the valve downstream of the regulator;
• Use auxiliary gas pressure to slowly increase the downstream pressure (Pa) above the preset value, but without triggering
the OPSO block. Use a calibrated pressure gauge for the reading;
• The generated overpressure will be discharged outwards and the Pa will begin to decrease to the relief valve calibration
setting. Relief valve operation is ascertained:
• Open the relief valve to discharge the overpressure created;
• Close the relief valve (the regulator goes to the closing pressure) and open the ball valve downstream of the regulator.
RG/2MCSH - RG/2MBHZ
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Madas Technical Manual - 5|5.3b - REV. 0 of 2 Sep 2019
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