Madas RG/2MB MIN Manual Del Usario página 16

6.2 - Adjusting the outlet pressure (P2 or Pa)
The outlet pressure P2 or Pa (unless specifically requested) is factory set with the top cover (37) positioned as shown in 3.2
a
and with the adjustment screw (2) set approximately at the minimum calibration value.
If the regulator is installed in different positions, check and reset the outlet pressure P2 or Pa.
Adjust the outlet pressure as follows:
• Unscrew the cap (1);
• Unscrew the adjustment screw (2) and set it to the minimum setting allowed (threaded end of the top cover (37));
• Start the system or make sure there is a minimum flow downstream of the regulator;
• 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 example
in 3.4);
• Screw the cap (1) back on and if necessary, seal it in that position using the appropriate seal holes (if present);
• Use pressure outlets (32) on the device only for zero flow or very low flow measurements.
6.3 - REPLACING THE adjustment SPRING (P2 or Pa)
• The step must be carried out without gas inside the regulator.
Replace the calibration spring of the pressure regulator:
• Unscrew and remove the cap (1) from the top cover (37);
• Completely loosen and remove the adjustment screw (2);
• Remove the spring washer (26);
• Remove the spring (3) from the top cover (37) and replace it with the new spring;
• Place the washer on the new spring again;
• Tighten the adjustment screw (2) and after starting the system as shown in 4.0, set the outlet pressure to the desired value
as shown in 4.2;
• Screw the cap (1) back on and if necessary, seal it in that position using the appropriate seal holes (if present);
7.0 - RECOMMENDED PERIODIC CHECKS
• Use a suitable calibrated tool to ensure the bolts are tightened as indicated in 3.2;
• Check the tightness of the flanged/threaded connections on the system;
• Check the tightness, that the regulator works and that the device is triggered (UPSO);
The final user or installer is responsible for defining the frequency of these checks based on the severity of the service conditions.
8.0 - MAINTENANCE
• Before carrying out any dismantling operation on the device, make sure that there is no pressurised gas inside.
Check the condition of the filter element (31) as follows
• For connections DN 20 - DN 25: loosen the fitting (23);
• For connections DN 32 - DN 40 - DN 50: loosen the fitting (9);
• Remove the bottom cover (29) of the device (shut off device) by unscrewing the fixing screws (28);
• Extract the filter element and check its conditions. Blow it and clean it and, if necessary, replace it (see figure "a" on the
next page for the positioning);
• Check the conditions of the sealing O-Ring (30) of the bottom cover (29), and replace it if necessary;
• Make sure the sealing O-Ring (30) of the bottom cover (29) is inside the relevant groove before putting it back on;
RG/2MB MIN - FRG/2MB MIN
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Madas Technical Manual - 4|4.3b - REV. 0 of 26 Feb 2019
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