Product Overview

Nl/s
0
0
bar
(air)
0,1
12
3456
0,5 1,5 2,5
3,5 4,5 5,5
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
1
7
6,5
5020
5022
1,1
Operation
The accumulation of air bubbles in the valve body causes the float
to drop so that the air vent valve opens.
This phenomenon occurs, and consequently the valve functions
correctly, as long as the water pressure remains below the
maximum discharge pressure.
Construction details
Hygroscopic cap
All MINICAL and VALCAL
models are equipped with a
hygroscopic safety cap. Its
functionality is based on the
properties of the cellulose fibre
discs that serve as the seal
cartridge and whose volume
increases by 50% as soon as
they become wet and thus
cause the valve to close. This
way, possible damages are
avoided in case of leakage.
Models with shut-off
The automatic shut-off valve,
which forms a seal with the
valve body by means of an
O-ring made of EPDM,
facilitates maintenance
operations by shutting off the
water flow when the valve is
removed and also allows for
easy inspection of the air vent
device.
Flow curves
Air flow (when the system is being filled)
Installation
- The valve is installed in the vertical position, on the air separator,
on manifolds, on riser pipes and generally in parts of the system
where a concentration of air pockets is to be expected.
- During operation the upper cap in the standard version must be
loosened whilst it must be completely hand tightened in the
hygroscopic version.
- It is not advisable to fit the valve in places which could be subject
to freeze. In such cases the Caleffi Maxcal Series 501 automatic
deaerator can be used.
- It is advisable to replace the valve cap with a Caleffi Series
5620 safety hygroscopic cap in all fitting locations which
cannot be inspected.
Accessories
- Check valve series 561 for air vent valves series
5020 and 5022 is available. 3/8” and 1/2”
connections. Available in brass or chrome plated
version. PTFE sealing on thread.
- Hygroscopic safety plug AQUASTOP series
5620 for MINICAL and VALCAL series is
available in brass or chrome plated.
- Small anti-suction valve series 5621 for air vent
valves for MINICAL and VALCAL series.
Series 5020
Automatic air vent valve. 3/8”M (or 1/2”M) threaded connection. Brass and chrome plated versions. Brass body and cover, PP
float, brass obturator stem, EPDM O-Rings. Medium: water and glycol solutions. Maximum percentage of glycol 30%. Maximum
working pressure 10 bar, maximum discharge pressure 2,5 bar. Maximum working temperature 120°C.
Series 5020
Automatic air vent valve. 1/2”M ( or 3/4”M) threaded connection. Brass and chrome plated versions. Brass body and cover, PP
float, brass obturator stem, EPDM O-Rings. Medium: water and glycol solutions. Maximum percentage of glycol 30%. Maximum
working pressure 10 bar, maximum discharge pressure 2,5 bar. Maximum working temperature 120°C. Complete with
hygroscopic safety cap.
Series 5021
Automatic air vent valve with automatic shut-off cock. 3/8”M (or 1/2”M) threaded connection. Brass and chrome plated versions.
Brass body and cover, PP float, brass obturator stem, EPDM O-Rings. Medium: water and glycol solutions. Maximum
percentage of glycol 30%. Maximum working pressure 10 bar, maximum discharge pressure 2,5 bar. Maximum working
temperature 110°C.
Series 5022
Automatic air vent valve. 1/4”M (3/8”, 1/2”M) threaded connection. Chrome plated with metallic cap. Brass body and cover,
PP float, brass obturator stem, EPDM O-Rings. Medium: water and glycol solutions. Maximum percentage of glycol 30%.
Maximum working pressure 10 bar, maximum discharge pressure 4 bar. Maximum working temperature 120°C.
SPECIFICATION SUMMARIES
We reserve the right to change our products and their relevant technical data, contained in this publication, at any time and without prior notice.
CALEFFI S.P.A. · I · 28010 FONTANETO D’AGOGNA (NO) · S.R. 229, N.25 · TEL. [phone] R.A. · FAX [phone]
· Http://www.caleffi.com · E-mail: [e-mail] ·
CALEFFI