Madas RG/2MTX Serie Manual Tecnico página 13

4.2 - ADJUSTING THE OUTLET PRESSURE
Before starting the system, make sure that the spring supplied with the regulator is suitable for the desired adjustment
pressure. The outlet pressure P2 (unless specifically requested) is factory set with the top cover (3) positioned as shown in
a
3.2 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.
Adjust the outlet pressure as follows:
• Unscrew the cap (1);
• Unscrew the adjustment screw (2) and set it to the minimum calibration 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 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 (6) on the device only for zero flow or very low flow measurements.
4.3 - REPLACING THE SPRING
The step must be carried out without gas inside the regulator.
Replace the spring as follows:
• Unscrew and remove the cap (1) from the top cover (3);
• Completely loosen and take out the adjustment screw (2);
• Remove the spring (15) from the top cover (3) and replace it with the new spring;
• 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);
5.0 - MAINTENANCE
• Before carrying out any dismantling operation on the device, make sure that there is no pressurised gas inside.
To check the status of the filter element (7) (the following operations can only be carried out for versions with
in-line fittings)
• Loosen the fastening screws (8) and very carefully remove the bottom cover (10) from the body (5);
• Extract the filter element (7) and check its condition. Blow it and clean it and, if necessary, replace it (see figure on the
next page for the positioning);
• Check the conditions of the sealing O-Ring (11) of the bottom cover (10), and replace it if necessary;
• Make sure the sealing O-Ring (11) of the bottom cover (10) is inside the relevant groove before putting it back on;
• Reassemble the bottom cover (10) and secure it in its original position, being very careful not to "pinch" or damage the
O-ring during tightening.
IMPORTANT: make sure that the centre pin (4) is centred in the guide of the bottom cover (10);
• Tighten the screws gradually, following a "cross" pattern, until the torque (tolerance -15%) indicated in table 1 on page 23
is reached. Use a calibrated torque wrench to do this.
• Check the body/cover tightness;
NOTE: for internal inspections, it is recommended to:
• Also check the obturator's integrity and, if necessary, replace the rubber seal (9);
• Replace the seals before reassembling.
Madas Technical Manual - REV. 0 of 10 May 2018
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RG/2MT...X - FRG/2MT...X