Product Overview

5026 - 5027
• Operating mechanism
The function of this device is guaranted
by an operating mechanism made of
silicon rubber specially designed to vent
when pressure reaches high values in
the system.
• Antivibration and antirotation
system on the float
This system guarantees that in the rest
position the air relief valve will not be
affected by any movement of the float.
• Check valve
The check valve on 5023 and 5027
series allows an easy maintenance
or substitution of the valve without
purging the system.
5022 - 5023
• Operating mechanism
The air is vented by means of a
stem mechanism protected
against debris from outside.
• Chamber
The height of the chamber for
float movement is designed to
collect high air volumes from
water.
• Hygroscopic cap
A safety hygroscopic cap
automatically closes the
air discharge in case of contact
with water.
5080
Valve code 5080 can be used manually or
automatically.
The automatic discharge is based on the
property of the cellulose fibre discs forming
the seal cartridge.
Drying times
Replaceable cartridge
The valve is constructed in such
a way that the part containing the
hygroscopic discs can easily be
replaced without having to empty
the heat emitter. This may be
necessary because the discs can
deteriorate in time if there is
unfiltered or hard water present.
In any case, it is advisable to
replace the disc cartridge at least
every 36 months.
The manual discharge
position is achieved by
unscrewing the knob approx.
one turn. Typical use of this
method is when refilling the
system.
The automatic discharge
position is achieved with the
knob fully closed.
In this way, when the system is operating under normal conditions,
the discs are immersed and, thanks to their increase in volume,
they close the valve. However, when air is present, the discs dry out
and allow the air to vent.
The hygroscopic discs close very quickly, in just a few seconds.
The drying times are such that there are no problems with the cycle
of formation and elimination of air.
The hygroscopic discs increase their volume by 50% when they are
immersed in water.
s s+50% s
Dry
disc
Immersed
disc
Dried
disc
Water
temperature
Times in hours
40 50 60 70 80 90 100
6 5 2 1/2 1 1/2 1 1/2 1/4
°C
104 122 140 158 176 194 212°F
Air flow
5026 - 5027
Flow rate
3.5 4
.5
4.5 5
.5
5.5 6
.5
3.5 2.5 2
.5
1.5 1
.5
0.5 0
90 80 70 60 50 40 30 20 10 0
(bar) (psi)
SCFM (SCFM) (Nl/s)
1
0.1
0
0.5
0.9
0.8
0.7
0.6
0.4
0.3
0.2
1.2
1.1
5022 - 5023
0
2.5
0.25
0.5
0.75
1
1.25
1.5
1.75
2
2.25
1
0,1
0
0,5
0,9
0,8
0,7
0,6
0,4
0,3
0,2
1,2
1,1