Product Overview

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)
0.1
0
0.5
0.9
0.8
0.7
0.6
0.4
0.3
0.2
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
Operation
The accumulation of air bubbles in the valve body causes the float
to drop so that the air vent valve opens when the water pressure is
below the maximum venting pressure rating.
Construction details
Models with check valve
The check valve, part number
59474A, seals off the vent body with
an EPDM O-ring, allowing easy
maintenance by shutting off the
water flow when the vent is
removed. This feature also allows for
easy inspection of the air vent.
Hygroscopic cap (optional)
All MINICAL models can be
equipped with the optional
hygroscopic safety cap, part
number R59681. This special cap
contains cellulose fiber discs that
form a seal by increasing their
volume 50% when they become
wet. This prevents potential damage
in case of leakage.
SYSTEM PRESSURE AIR VENTING FLOW RATE
PSI BAR SCFM Nl/s
5 0.34 0.64 0.30
10 0.69 0.85 0.40
15 1.03 1.06 0.50
20 1.38 1.25 0.59
25 1.72 1.29 0.61
30 2.07 1.44 0.68
35 2.41 1.48 0.70
40 2.76 1.55 0.73
50 3.45 1.60 0.76
Flow curves
Air flow (when filling the system)
Accessories
- Check valve, part number 59474A, for
automatic air vents 1/8” connection, brass.
- Hygroscopic safety cap, part number R59681.
- Small anti-suction air vent cap, part number
562100, for automatic air vents.
Installation
- The air vent 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 expected.
- During operation the upper cap in the standard version must be
loosened If, however, the hygroscopic safety cap, pn R59681, is
used, completely hand tighten it.
- It is recommended that the standard vent cap be replaced with a
Caleffi R59681 hygroscopic safety cap in locations that
cannot be inspected.
Series 5020
Automatic air vent for hydronic systems using water and glycol solutions. 1/8” NPT Male threaded connection. Brass body and
cover, Polypropylene float, brass valve stem, stainless steel vent wire lever and spring, and EPDM O-Rings. Maximum working
pressure 150 psi (10 bar), maximum venting discharge pressure 40 psi (2.5 bar). Maximum working temperature 250°F (120°C).
Series 5021
Automatic air vent with the check valve for hydronic systems using water and glycol solutions. 1/8” NPT Male threaded
connection. Brass body and cover, Polypropylene float, brass valve stem, stainless steel vent wire lever and spring, and EPDM
O-Rings. Maximum working pressure 150 psi (10 bar), maximum venting discharge pressure 40 psi (2.5 bar). Maximum working
temperature 230°F (110°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 North America, Inc.
3883 West Milwaukee Road / Milwaukee, WI 53208
Tel: [phone] / Fax: [phone] / www.caleffi.us
© Copyright 2010 Caleffi
CALEFFI