15
AUTOMATIC AIR VENT VALVES
• Automatic Air Vent Valves provide automatic
air venting for hot or cold water distribution
systems. These vents purge air that may be in the
water system.
• The vent valve utilizes a float to actuate the
valve plug which is located at the top of the
valve. Once the air is displaced and the system
pressure is sustained, the valve plug seals and
prevents any water from escaping from the
system.
• The float vent can also operate as an anti-
vacuum device since it will permit air to enter the
system when it must be drained. It can also be
installed to permit the separation and dispersal of
air while fluid is actually circulating in the
system.
Overview:
• Body and cover are brass construction
• Air vent with silicone rubber seal
• Impurities do not usually affect function as
maximum float line of water is always lower
than the valve seal
• Float is high temperature resistant polyethylene
• Suitable for use with glycol systems
•Can be disassembled for inspection and cleaning
Operating Range:
Minimum working pressure: 1.45psi (10 kPa)
Maximum working pressure: 150psi (10 bars)
Temperature Range: 33°F – 240°F (5°C –
116°C)
Performance:
Performance curve details the quantity of air
vented by the “Float Vent” according to the
pressure in the system
.
Note:
In order to get the best results in venting
air from risers, use connecting pipes of at least
1
⁄
2" diameter between the “Float Vent” valves
and installation.
Installation:
When the air vent valve is installed as shown, the
air will not be vented while the fluid is
circulating in the system, but it can vent when
the system is shut off.
The figure below shows the installation of the
vent valve for the venting of air while the fluid is
circulating in the system and the required
increase in pipe size in order to obtain proper
separation of air from water.
