Function
Float type automatic air vent designed to vent air that is released
from the water at high points in piping. Example
applications include domestic hot water storage tanks and
recirculation system pump inlets. Compatible with plumbing
systems low-lead brass body certified and listed by ICC-ES.
Product range
Code NA502640A Low-lead automatic air vent ½” NPT male
Technical characteristics
Materials: Body:
DZR low-lead brass
Seals:
peroxide-cured EPDM
Performance: Max. working pressure:
150 psi (10 bar)
Max. discharge pressure:
90 psi (6 bar)
Max. discharge flow rate:
1.75 scfm (0.83 l/s)
Max.
working temperature:
240°F (115°C)
NSF/ANSI 372-2011, Drinking Water System Components-Lead Content
Reduction of Lead in Drinking Water Act, California Health and Safety Code
116875 S.3874, Reduction in Drinking Water Act, certified by ICC-ES, file PMG-1360.
PLUMBVENT™ Low-lead automatic air vent
NA502640A
© Copyright 2018 Caleffi
H0004951
www.caleffi.com
Installation
The vent is installed in the vertical position on riser pipes and generally in parts of the system
where a concentration of air pockets is to be expected.
Operating instructions
The automatic air vent can be used for manual or automatic venting of hydronic and plumbing
systems. The automatic air vent is supplied complete with a safety hygroscopic cap that
automatically closes the air discharge in case of contact with water.
For normal automatic venting, keep hygroscopic cap closed for a slow release of air. A fast release
of the air may allow dirt or scale in the water to plug the operating mechanism. The small hole in
the side of the cap allows air to escape.
Service instructions
For optimum performance replace hygroscopic cap every 3 years. The natural cellulose fiber
washers can deteriorate over time when exposed to unfiltered or hard water.
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