Madas MN28 Manual Del Usuario página 11

3.2 - INSTALLAZIONE (vedere esempio in 3.4)
IMPORTANT: this solenoid valve is periodically subjected to a random burst test. The first deformation occurs
with a pressure of no less than 35 bar.
In closed circuits it is inevitable that the variation in temperature (even if not substantial) can cause the fluid to
expand inside the pipes, and the fluid, as it has no vent and cannot be compressed, can reach very high pressures.
It is therefore advisable to always install a vent valve, calibrated at a pressure of approximately 8-10 bar,
that drains into the tank.
Threaded devices:
• Assemble the device by screwing it, with the due seals, onto the plant with pipes and/or fittings whose threads are consistent
with the connection being attached;
• Do not use the coil (1) as a lever to help you screw it on, only use the specific tool;
• The arrow, shown on the body (8) of the device, needs to be pointing towards the application;
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 an excessive space in between, do not try to reduce the said gap by excessively
tightening the bolts of the device;
• The arrow, shown on the body (8) of the device, needs to be pointing towards the application;
• Insert the relative washers inside the bolts in order to prevent damage to the flanges during tightening;
• When tightening, be careful not to "pinch" or damage the gasket;
• Tighten the nuts or bolts gradually, in a "cross" order (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):
• The device must be installed downstream of a safety solenoid valve, with the arrow on the body (8) pointing towards the
application and with the coil (1) facing upwards (see figure below and installation example in 3.4).
• 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 is 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 only on
the connections (threaded or flanged) of the individual devices;
• In any case, following installation, check the tightness of the plant;
• Wiring cannot have cables connected directly to the coil. ALWAYS and ONLY use the connector identified by the
manufacturer;
Madas Technical Manual - 8|8.1 - REV. 0 of 10
Diameter DN 25
Max. torque (N.m)
11
Oct 2018
th
DN 32 DN 40 DN 50
30 50 50 50
MN28