Brochure

Application
The Taco 4900 Series Air Separators are
designed for the complete elimination
of air from closed loop heating and
cooling systems up to a maximum
temperature of 240°F and a maximum
pressure of 150 psi. The principle on
which the Taco 4900 Series Air Separator
is based is a patented and proven
method of removing gases from water:
the PALL ring process.
The PALL Ring Process Removes Air:
• Present Before or During the Filling of the System
• That Collects after the System is Filled
• Present in System Water in the Form of Small Bubbles
and Micro-bubbles Entrained in the Water
• Dissolved in the System Water
The Presence of Air can Lead to:
• Irritating Noises
• Reduced Efficiency
• Reduced Operational Life of the System as a
Result of Internal Corrosion of Essential Parts
such as the Boiler and Radiators
• Cavitational Erosion of the Pump Impeller
• Degraded Operation of the Circulation Pump
The Coalescence Effect
Both small air bubbles and micro-bubbles will adhere to a
surface and join together to form larger air bubbles. These
combined bubbles then traverse up through the water and
into the air chamber to be released by the vent.
Pall Rings
An optimum coalescence effect is achieved by the 4900 Series’
use of the patented pall ring process. The PALL Ring chamber
is engineered to optimize the collision of the flowing system
water with the PALL Rings. As a result of this collision, all of
the gas containing water particles are brought into contact
with the entire pall ring surface area. Even the smallest micro-
bubble present in the water will adhere to the surface of a pall
ring, allowing coalescence to occur and air to be removed.
Conical Venting Chamber
The air chamber of the 4900 Series is conical in shape. The
advantage of this construction is that the distance between
the water level and the venting valve is greater than that of a
straight air chamber, due to the effects of pressure. Thus any
dirt or impurities floating on the fluid within the air separator
will remain well clear of the venting mechanism during normal
operating conditions. This means that fouling of the gearing
and venting valve is reduced to a minimum.
4900 SERIES AIR SEPARATOR
Features
• Patented PALL Ring Design
• Eliminates Air Induced System Noise
• Minimal Pressure Loss
• Vent can be Closed
• Large Surface Contact Area
• Protective Vent Plate
• Rugged Dependability
• Maximum Air Removal
• Convenient Expansion Tank Connection Tapping
• No Minimum Run of Pipe Requirement
• Bidirectional Flow
4900 Series proved to be better!
Tests carried out at the Delft Technical University have
unequivocally proved that 4900 Air Separators remove
all micro-bubbles from15 microns and up. This is three
times better than comparable Air Separators!
Water Level Diagram
Pall Rings
VENTING VALVE
WA
TER
LEVEL
A
VENTING VALVE
A
WATER LEVEL
A
A
VENTING VALVEVENTING VALVE
WATER LEVEL
WATER
LEVEL
4900 Series Air Chamber Straight Air Chamber
1/2” NPT Connection
1 Integral
Shut-O Valve
2 Hose Clamp
Drain Connection
3 Vent Chamber
4 Float
5 Protective Plate
6 PALL Rings
7 Brass Body
Air Removal Diagram