D860MGB rev04 8/32
has to be as reduced as possible.
When a rigid pipe is used, please note that:
• The pipe cut has to be perfectly at 90°.
Figure 2 - "WALFORM" fitting
• Possible bends have to be made when cold, using a proper pipe bending.
• The use of a flame can cause cinders inside the pipe.
• Cinders and dirt caused by the cut have to be completely eliminated
• When connecting two pipes to a cutting ring, make sure that the two pipes are perfectly aligned and
that the cutting part of the ring is turned towards the end of the pipe. Before tightening the nut of the
fitting, oil both the thread and the ring. Therefore screw with power and unscrew to control that the
cutting ring has engraved. Finally, screw again definitely the nut of the fitting, tightening it well.
Non-normalized pipes are too hard and they can get out of the fitting!
Warning: some countries do not allow the use of a joint with a cutting ring. In these cases, it is
necessary to use a type of fitting called "WALFORM" for the connection (see Figure 2) or fittings to
be welded.
When a flexible hose is used, please note that:
• The flexible hose has not to be subject to tension, torsion and the bends have to be as wide as
possible
• The minimum bending radius given by the manufactures has to be respected. It is reported in the
following table:
The pump units with a capacity from 360 to 600 l/min have a 2" outlet. These pump units can feed a single
cylinder with a rupture valve 2" or two cylinders together.
- In case of a single cylinder, the connection between the pump unit and the rupture valve can be made:
• With a single flexible hose 2" and nipples 2", 60° angle (see Figure 3);
• with two parallel steel pipes, diameter 42 mm and two three-way fittings 1 ½”x 2” x 1 ½” (see Figure
4)
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