Madas MVS/1 Manual De Instrucciones página 11

Flanged devices:
• Assemble the device by flanging it, with the due seals, onto the plant with pipes whose flanges are consistent with the
connection being attached. The gaskets must be free from defects and must be centred between the flanges;
• If, after installing the gaskets, there is still too much space in between, do not try to reduce said gap by excessively
tightening the bolts of the device;
• The relief valves are installed downstream of the regulators and can be installed in any position.
• Insert the relative washers inside the bolts in order to prevent damage to the flanges during the tightening stage;
• When tightening, be careful not to "pinch" or damage the gasket;
• Tighten the nuts or bolts gradually, in a "cross" pattern (see the example below);
• Tighten them, first by 30%, then by 60% and finally 100% of the maximum torque (see the table below according to
EN 13611);
• Tighten each nut and bolt again clockwise at least once, until the maximum torque has been achieved uniformly;
Common procedures (threaded and flanged devices):
• During installation, avoid debris or metal residues from getting into the device;
• To guarantee mechanical tension-free assembly, we recommend using compensating joints, which also adjust to the pipe's
thermal expansion;
• If the device needs to be installed in a ramp, it is the installer's responsibility to provide suitable supports or correctly sized
supports to properly hold and secure the assembly. Never, for any reason whatsoever, leave the weight of the ramp resting
only on the connections (threaded or flanged) of the individual devices;
• In any case, following installation, check the tightness of the plant;
3.3 - INSTALLATION IN PLACES WHERE THERE IS THE RISK OF EXPLOSION (DIRECTIVE 2014/34/EU)
The valve complies with Directive 2014/34/EU as group II equipment, category 2G and as group II equipment, category 2D;
consequently, it is suited for installation in zones 1 and 21 (besides zones 2 and 22) as classified in Annex I of Directive
99/92/EC.
The valve is not suitable for use in zones 0 and 20, as defined in aforementioned Directive 99/92/EC.
To determine the qualification and size of the danger zones, please refer to standard IEC EN 60079-10-1.
If installed and subject to maintenance in full compliance with all conditions and technical instructions provided in this manual,
the device does not pose a source of specific hazards: in particular, under conditions of normal operation, the valve is
expected to emit a flammable substance into the atmosphere only occasionally.
Convey the valve discharge outside, in a non-hazardous ventilated area.
The valve can be dangerous with respect to the presence of other equipment nearby in case of failure, of the operating
membrane (11) and of the safety membrane (5): in this case (and only in this case) it constitutes a source of emission of
explosive atmosphere of continuous degree and, as such, it can originate dangerous zones 0 as defined in the Directive
99/92/EC.
In particularly critical installation conditions (unattended areas, poor maintenance or poor ventilation) and especially if there
are potential sources of ignition and/or hazardous equipment near the valve in regular operation, as they may generate electric
arcs or sparks, a preliminary assessment of the compatibility between the valve and such equipment must be carried out.
In any case, every useful precaution must be adopted so as to prevent the valve from generating zones 0: for example,
annually verify regular operation, possibility of changing the degree of emission of the source or intervening on the external
explosive substance discharge.
For this purpose the threaded hole of the top cover (15) can be connected to the outside (using appropriate fittings and pipe)
by removing the dust cap (4). The threaded hole connection can be G 1/4 or G 3/8 (see indications In fig. 1, 2, 3, 4 and 5).
Madas Technical Manual - 7|7.4 - REV. 1 of 28
Diameter
Max. torque (N.m)
11
May 2019
th
DN 25 DN 32 DN 40 DN 50
30 50 50 50
MVS/1 - MVSP/1