Expansion Vessels - Why?In practice water cannot be compressed and
therefore any increase in water volume must be accommodated in an
expansion vessel designed and sized for that purpose. Naturally, as
water heats up, it expands. This expanded water has to go
somewhere. In an open type system the open expansion tank situated
at the highest point of the system would accommodate this extra
volume. A closed type system does not have an open fixture such as
described above. Hence, a correctly sized Dezhi/Aqua Leader
expansion vessel is necessary. When properly sized, the Dezhi/Aqua
Leader Expansion Vessel will accommodate the expansion of the fluid
during the heating or cooling cycle without allowing the system to
exceed the pressure limits of any of the components in the system.
Configuration and FeaturesDezhi/Aqua Leader Expansion Vessels
incorporate a diaphragm/bladder arrangement which provides a
flexible barrier between the system fluid and the precharged air in
the vessel. As the system water expands, the bladder also expands
pushing against the precharged air cushion. This is how the
expansion is accommodated in a closed-loop system. Standard
construction is carbon cold pressed steel with natural rubber or
EPDM membranes. Temperature limits are 10oC to 99oC. Working
pressures vary from 3 Bar to 35 Bar depending upon which vessel is
selected. Higher pressure ratings of 45 and 50 Bar are available if
required. Other Features • Replaceable bladder • Threaded
connections - stainless. • Pre-set pressure 400KPa - variable. •
Wall mount bracket available for 8-36 litres. • Also available in
stainless steel. • Relief valve supplied loose to suit system
pressure - please specify. Sizing for Expansion VesselsIn order to
select a suitably sized expansion vessel, the following information
is required: • Total system water volume in litres. • Temperature
of water when system is filled (in oC) and average maximum
operating temperature (in oC). • Minimum operating pressure in kPa
and maximum operating pressure (10% below relief valve, in kPa). •
Which level of the building it will be installed and number of
levels there are above it? Suggested Specification Expansion
Vessels shall be the closed type similar to Dezhi/Aqua Leader
(available from Taizhou Tianyang Electrical Co., Ltd ) or approved
equal and suitably sized to suit the system temperature and
pressures likely to be encountered. Vessels construction to be
fully welded and sealed steel construction, complete with integral
EPDM rubber liner to maintain the water within the system without
exposure to air or contamination. Each Vessel to be supplied with a
suitably safety relief valve vessel must have a replaceable
bladder. Taizhou Tianyang Electrical Co., Ltd reserves the right to
make changes without notification. IntroductionDezhi expansion
vessels are suitable for use in central heating and cooling
installations.Nitrogen, a dry inert gas used in the Dezhi/Aqua
Leader range of expansion vessels, improves the vessel's life
span by reducing corrosion inside the vessel, and prevents loss of
pre-charge pressure. Nitrogen permeates through rubber slower that
oxygen and is far less reactive to both steel and aluminium
creating fewer debris inside the vessel. Nitrogen does not degrade
rubber prolonging the membrane life.Oxygen in compressed air
permeates through the membrane, thus reducing the pre-charge
pressure over time. During normal operation, oxygen oxides the
membrance in the vessel, causing under inflation pressure and will
not corrode the inside of the vessel.It's recognised in the
industry that oxidative ageing is one of the primary causes of
decreased vessel life. Tests have shown that if vessels are
inflated with Nitrogen, there is a significant reduction in failure
and increased vessel life.For use under high pressure. Top-quality
high strength steel, with a gleaming red (RAL 3002) epoxy powder
coating - perfect protection and finish. Clamp ring of heavy-duty
thermally-galvanised steel. Our flexible EPDM Bladder with
rolling action are suitable for use with glycol based anti-freeze
addition up to 50%. Exact details are available on request. The
nitrogen airvalve is sunk and cannot be damaged due to the cap and
extra protective plastic beige coverplate. Uncoated threaded system
connection, ensuring problem free connecting.SpecificationsMax.
working pressure: 10 bar(g)Max. temperature at (heating)
outlet: 99 °C.Max. temperature diaphragm: 99 °C
(DIN4807/3).Max. supply temperature (boiler): 90 °C.Min. working
temperature: -10 °CIn accordance with Pressure Equipment Directive
97/23/EG.The main elements of the membrane tank are a metal case of
high-quality deep-drawn steel and an elastic membrane made of Butyl
Rubber Membrane separating the tank into two chambers - an air
(cavity between the metal case and a membrane) and a water one (the
internal cavity of the membrane). The air chamber is
constantly under a pre-set air pressure. The service life of
diaphrag
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