Aquaflex Expansion Vessels

Aquaflex Expansion Vessels incorporate a bladder arrangement which provides a flexible barrier between the system fluid and the precharged air in the vessel.

Economical, reliable and convenient

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 10 Bar depending upon which vessel is selected. Higher pressure ratings of 16 and 25 Bar are available if required.

Standard nominal tank capacities range from 8L up to 10,000L.

Features typically include:

  • Replaceable bladder
  • Threaded connections – stainless.
  • Pre-set pressure 400KPa – variable.
  • Wall mount bracket available for 8-25 litres.
  • Also available in stainless steel.
  • Relief valve supplied loose to suit system pressure – please specify.

 

WE CAN HELP YOU CHOOSE THE RIGHT Aquaflex Expansion Vessels FOR YOUR PROJECT

Sizing for Expansion Vessels
In 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?

Case Study

View the complete project

PIPE MOUNTED TANKS
PART NO. NORMAL VOLUME (L) EXPANSION CAPACITY PRESSURE MAX (KPa) WEIGHT (KG) A BSP (INCH) H (MM) Ø D (MM)
6AF2 2 1 300 1.1 1/2 270 100
6AF8 8 4 300 1.9 1 330 200
6AF12 12 6 300 2.6 1 310 240
6AF19 19 10 300 3.6 1 370 300
6AF24 24 12 300 4.8 1 430 300
6AF24S 24 12 300 4.8 1 325 350
6AF35 35 17 300 5.5 1 450 350
PIPE MOUNTED TANKS
PART NO. NORMAL VOLUME (L) EXPANSION CAPACITY PRESSURE MAX (KPa) WEIGHT (KG) A BSP (INCH) H (MM) Ø D (MM)
6AF2 2 1 300 1.1 1/2 270 100
6AF8 8 4 300 1.9 1 330 200
6AF12 12 6 300 2.6 1 310 240
6AF19 19 10 300 3.6 1 370 300
6AF24 24 12 300 4.8 1 430 300
6AF24S 24 12 300 4.8 1 325 350
6AF35 35 17 300 5.5 1 450 350
VERTICAL TANKS WITH LEGS
MODEL CAPACITY (L) PRESSURE (BAR) DIAMETER (D) HEIGHT (H) CONNECTION (H)
10AF35 35 10 350 mm 610 25 mm MALE
10AF50 50 10 350 mm 760 25 mm MALE
10AF80 80 10 425 mm 930 25 mm MALE
10AF100 100 10 480 mm 990 25 mm MALE
10AF150 150 10 480 mm 1080 25 mm MALE
10AF200 200 10 500 mm 1120 32 mm FEMALE
10AF300 300 10 640 mm 1250 32 mm FEMALE
10AF500 500 10 750 mm 1490 32 mm FEMALE
10AF750 750 10 800 mm 1920 50 mm FEMALE

Frequently asked Questions

A diaphragm type tank has air in the diaphragm and water between it and the vessel. A bladder tank is in the reverse of this, that is water in the bladder and air between it and the vessel. This means there is no contact between the water and mild steel vessel, thus eliminating the potential for rust. Furthermore, the partial acceptance, that is the expansion capacity, of a diaphragm tank is 50%. So for a 100L tank for example, expansion capacity is only 50L. However on a bladder tank, the partial acceptance is 65-80%, depending on the model. This means more expansion capacity out of tank the same size.

It should equal the water pressure in the system, so 150kPa water pressure should mean you insert 150kPa air pressure so that the air is not greater than the water otherwise it will push the water back out. The precharge pressure for the standard AQUAFLEX Expansion Tanks, ex-factory are as follows: • 8L to 80L = 200kPa • 100L + = 400kPa
Yes, Aquaflex tanks with EPDM bladder are compatabile for Propylene Glycol mixture to 50%.

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