Specification

Air in system water
causes many problems.
Noisy pipes, valves, and other air-related noises are often
accepted as the signs of a functioning system. Excessive
pump noise, cavitation, and cascading in terminal units
are considered normal.
But… air in system water can cause corrosion, reduced
efficiency, poorly heated or inadequately cooled rooms,
accelerated component wear and on-going complaints.
There is a device that will keep your system free of air …
permanently. Less maintenance, quiet operation,
fewer costs!
The name:
SPIROVENT
Unlike conventional air eliminators or air scoops, the
Spirovent completely eliminates 100% of the free air,
100% of the entrained air, and up to 99.6% of the dissolved
air in the system. Consisting of woven copper wire soldered
to a copper tube, the patented Spirotube
®
creates a low
velocity area in the Spirovent that scrubs the bubbles
from the water. The air bubbles rise and collect in the air
chamber before they are vented from the system via an
integral automatic valve. Air problems become a thing
of the past.
Install the Spirovent for optimum performance
Ideal placement of the Spirovent Junior is based on
microbubble separation and Henry’s Law. Simply put,
Henry’s Law states that air is released from water as
the temperature increases or the pressure decreases. In
hydronic heating systems, the Spirovent should be installed
in the boiler supply line where the temperature is highest.
Should the circulator be located on the supply line as well,
the Spirovent should be installed between the boiler and
the circulator where pressure is also the lowest.
ADVANTAGES TO THE
INSTALLER AND END-USER
 Maintenance free.
 No venting required.
 Vent head is designed to stay dry. Dirt and
leak resistant.

1
⁄2” male thread port for pressure testing or
remote venting of unwanted gases.
 Quiet operation.
 Increased component life.
 Reduced oxygen-based corrosion and pump
cavitation.
The principal difference
The Spirotube is the core of the Spirovent. It allows the
Spirovent to scrub out 100% of the free air, 100% of the
entrained air, and up to 99.6% of the dissolved air in the
system. Even the smallest microbubbles coalesce and rise.
Air is eliminated, component life and heat transfer abilities
are increased; oxygen-based corrosion and pump cavitation
are reduced; and annoying gurgling, cascading, and other
air-related system noises are eliminated.
Baseboard
Boiler
Pressure
Reducing
Valve
Backflow
Preventer
Shut-off
Valve
Water
Supply
Circulator
Expansion
Tank
Spirovent
Spirotop
PERMANENTLY AIR FREE SYSTEM WATER
1. Unique valve mechanism
is guaranteed not to
leak and cannot be shut
off. Standard thread for
vent pipe connection or
pressure testing.
2. Specially constructed air
chamber to protect the
valve mechanism from
dirt. Sufficient volume
to handle pressure fluc-
tuations.
3. Solid brass
construction for
extended service life.
4. Threaded or
sweat connections
available.
5.
1
⁄2” tank mount
(not available on
vertical models).
6. The unique Spirotube
is the core of the
Spirovent. Designed to
trap even the smallest
microbubbles, yet it
offers little resistance
to flow.