First Start-Up; Important - Madas MVB/1 MIN Mode D'emploi

5.0 - FIRST START-UP

Before commissioning, verify that:
• All of the instructions on the rating plate, including the direction of flow, are observed;
• The hole of the dust cap (13) is not clogged.
• IMPORTANT: The pressurisation manoeuvre of the equipment must be carried out very slowly so as to avoid
possible damage;
• NOTE: under no circumstances should a blind cap be placed instead of the dust cap (13) as the regulator may
not work;
• Close the ball valve downstream of the regulator;
• Slowly open the upstream shut-off devices;
• After having gradually pressurised the system, proceed with manual reset (see 4.0) and check the tightness and operation
of the valve.
6.0 - UPSO CALIBRATION
Before performing the operations, make sure that the supplied spring is suitable for the desired UPSO range.
• Unscrew the cap (10);
• Unscrew the underpressure shut off adjustment screw to the minimum (11);
• Start the system and reset the shut off device as described in 4.0;
• Reduce the downstream pressure to the desired trigger value;
• Tighten the adjustment screw (11) until the 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 adjustment screw (11);
• Tighten the cap (10) in the original position.
7.0 - MAINTENANCE
• Before carrying out any dismantling operation on the device, make sure that there is no pressurised gas inside.
• To check the valve seal parts, loosen the fixing screws (3) of the cover (2). At this point check the integrity of the obturator
(7) and, if necessary, replace the rubber seal gasket (4);
• Next, check the conditions of the sealing O-ring (8) of the cover (2), and replace it if necessary (recommended);
• Make sure the O-ring (8) of the cover (2) is inside the provided groove;
• Reassemble the cover and secure it in its original position, being very careful not to "pinch" or damage the O-ring during
tightening;
• Tighten the screws (3) gradually, following a "cross" pattern, until the torque (tolerance -15%) indicated in the table below
is reached. Use a calibrated torque wrench to do this.
• Check the body/cover seal.
Screw
Max torque (N.m)
Madas Technical Manual - 7|7.3 - REV. 0 of 1
M5 M6
Galva- Stainless Galva-
nised Steel nised
6 4.5 10
Apr 2019
st
M8
Stainless Galva- Stainless
Steel nised Steel
7.5 25 18.5
13
M10 M12
Galva- Stainless Galva-
nised Steel nised
49.5 37 84.5
Stainless
Steel
63.5
MVB/1 MIN