1.
Expansion Vessels
Flamco produces a comprehensive range of diaphragm expansion
vessels. Both the steel vessel and the diaphragm are of the highest
quality. They are compliant with all prevailing European standards and
carry the CE mark of conformity. Flamco vessels are available for both
potable, chilled and heated water systems in sizes ranging from 2 litres
up to 8,000 litres.
16
Product overview • 2013
We reserve the right to change designs and technical specifications of our products.
1
Expansion Vessels
Product overview • 2013
We reserve the right to change designs and technical specifications of our products.
17
Expansion Vessels Overview
Fixed Diaphragm
Removable bladder
Diaphragm
Removable
Flexcon Intermediate
bladder Vessels
Contra-Flex
Flexcon M
Flexcon VSV
Flexcon C
Flexcon PRO
Flexcon V-B
• 8 - 200 litres.
• Max. operating pressure;
3 bar: 8 35 litres,
6 bar: 50 - 200 litres.
• 2 - 1,000 litres.
• Max. operating pressure: 3 bar
• For small installations.
• 80 - 8,000 litres.
• Max. operating pressure:
6/10/16/25 bar.
• High-quality industrial tank.
• Larger dimensions available on
request.
• 200 - 1,000 litres.
• Max. operating pressure: 6 bar.
• For central heating systems in which
the inlet temperature exceeds 90 °C or
the return temperature exceeds 70 °C.
• Max. operating temperature: 160 °C.
• Operating pressure: 6/10 bar.
• For central heating systems in which
the inlet temperature exceeds 90 °C or
the return temperature exceeds 70 °C.
• Max. operating temp.: 120/160 °C.
• Max. operating pressure: 6/10 bar.
Flexcon
• 110 - 1,000 litres.
• Max. operating pressure:
6 bar: 110 - 1,000 litres,
10 bar: 110 - 1,000 litres.
• For systems large and small.
Flexcon TOP
• 8 - 80 litres.
• Max. operating pressure: 6 bar.
• High-pressure alternative
for smaller systems.
Cubex R
• 12 - 18 litres.
• Max. operating pressure: 3 bar.
• Space-saving alternative
for smaller systems.
Flexcon Solar
• 8 - 1,000 litres.
• Max. operating pressure:
8 bar: 8 80 litre,
10 bar: 110 - 1,000 litres.
• For solar systems.
Flexcon P
• 18 - 50 litres.
• Max. operating pressure: 3 bar.
• Space-saving alternative
for smaller systems.
18
Product overview • 2013
We reserve the right to change designs and technical specifications of our products.
1
Expansion Vessels
Flexcon P: Space Saving Expansion Vessels
of Superior Quality
• Butyl rubber diaphragm: Excellent pre-charge gas pressure maintenance.
• Pre-formed convex diaphragm with flexible 'rolling' action prevents the
diaphragm from stretching.
• The proven Flamco clamp ring construction permits the use of a butyl
rubber diaphragm that is approximately half the size of a full diaphragm in a
comparable vessel. This ensures reduced permeability and a long service
life for the expansion vessel.
• Quick, easy and space saving installation using the wall mounting bracket.
• 5 year warranty.
FLEXCON P 18
FLEXCON P 25
FLEXCON P 35
FLEXCON P 50
Product overview • 2013
We reserve the right to change designs and technical specifications of our products.
19
Vessel Calculation for Central Heating Systems
Calculation for a Flexcon expansion vessel
for central heating systems with fixed or
removable diaphragm
Basic parameters for the calculation of a Flexcon
expansion vessel.
• Vessel volume
This is the total capacity of the Flexcon expansion
vessel.
• Vessel efficiency
This is the maximum amount of expansion water
that can be contained in the vessel.
• Static height
This is the height of the system from the Flexcon
expansion vessel connection to the highest point of
the system measured in water column metres,
(1 wcm 0.1 bar).
• Initial pressure of the Flexcon expansion vessel
This is the pressure measured at the nitrogen filler
valve at ambient temperature and atmospheric
pressure. The pressure is equivalent to the static
height, rounded up to a factor of 0.5 bar.
• Maximum working pressure
This is the maximum permissible system pressure at
the Flexcon expansion vessel. The maximum
working pressure may not exceed the maximum
value indicated on the expansion vessel.
• Output
This is the ratio between the gross and net vessel
capacity.
Net contents
Output = –––––––––––––––
Gross capacity
• The output is determined by the ratio between initial
and end pressure. In formulaic form, this is as
shown below (derived from Boyle's Law):
end pressure – initial pressure
Output = ––––––––––––––––––––––––––––
end pressure
Pre-charge
pressure
Pre-charge pressure 0.5 bar
20
Product overview • 2013
Pre-charge pressure 1.0 bar
We reserve the right to change designs and technical specifications of our products.
1
Expansion Vessels
Note:
•
•
•
•
pressure in bar absolute
Max. output of Flexcon expansion vessels
with fixed diaphragm 0.63.
Max. output of Flexcon 800 litre expansion
vessel = 0.5,
Flexcon 1,000 litre expansion vessel = 0.4.
Max. output of Flexcon M = 0.72.
If the maximum output of an expansion vessel is
exceeded, the diaphragm may be subjected to tensile
stress. This could lead to damage to the diaphragm
or even cause it to rupture.
• System water capacity
This is the total volume of water in the entire system
including heat source, radiators, pipe work etc.
Product overview • 2013
• Expansion volume
The expansion volume is calculated as follows:
expansion volume = water capacity x increase in
volume at average heating temperature.
Example: heating temperature 90/70 °C
(average 80 °C) = 2.89%.
• Safety factor
We recommend including a margin of 25%
when calculating the expansion volume.
• Gross capacity of Flexcon expansion vessels
The gross capacity of Flexcon expansion vessels is
calculated as follows:
expansion volume x 1.25
Gross capacity of vessel = ––––––––––––––––––––––––
output
We reserve the right to change designs and technical specifications of our products.
21
• Increase in volume of water in %
The table below shows the percentage volume
increase of water as temperature increases from
10°C to 110°C.
Temperature increase
[°C]
10
10
10
10
10
10
10
10
10
10
10
10
• Temperature in the Flexcon expansion vessel
The maximum continuous temperature in the
Flexcon expansion vessel is 70 °C.
The minimum permissible temperature in the Flexcon
expansion vessel is -10 °C.
Volume increase
[%]
0.35
0.63
0.75
0.96
1.18
1.42
1.68
2.25
2.89
3.58
4.34
5.16
- 25
- 35
- 40
- 45
- 50
- 55
- 60
- 70
- 80
- 90
- 100
- 110
6
Volume increase [%]
5
4
3
2
1
0
10
20
30
40
50
60
Temperature [°C]
70
80
90
100
110
120
FLAMC 1273
22
Product overview • 2013
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1
Expansion Vessels
Output
In this table you can read off the output for various levels of initial and end pressure.
We recommend a margin of at least 1.5 bar between the initial and end pressure.
Static height
[m]
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
Initial pressure
[bar]
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
End pressure
[bar]
3
6
8
10
0.63
0.50
0.38
0.25
0.13
-
0.71
0.64
0.57
0.50
0.43
0.36
0.29
0.21
-
0.72
0.67
0.61
0.56
0.50
0.44
0.39
0.33
0.28
0.22
0.17
-
0.68
0.64
0.59
0.55
0.50
0.45
0.41
0.36
0.32
0.27
0.23
0.18
Approximation of the water capacity
of the system
In order to be able to determine the required capacity
of the Flexcon vessel, the water capacity of the system
as a whole must be calculated. If it is not possible to
determine the capacity of the system, it can be
approximated using the historic data shown here,
based on a supply/return temperature of 90/70 °C.
Central heating system with
Capacity
[l/kW] [860 kcal/h]
convectors and/or air heaters
induction units
air treatment systems
panel radiators
central heating utilities mix
column radiators
cooled water utilities mix
heated ceiling and/or
under-floor heating
extensive pipework
(district heating)
5.2
5.5
6.9
8.8
10.0
12.0
20.0
18.5
25.8
The water capacity of the system can be approximated
by multiplying the output of the system by the values
specified in the table. The table refers to new systems.
For older systems, we recommend using higher values.
This method is an indication only and does not
guarantee a precise calculation of the capacity required
for your Flexcon expansion vessel.
Product overview • 2013
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23
Example calculations for Flexcon expansion vessels
Example 1
Example 2
Data
- water capacity
= 340 liters
- average heating temperature (90/70 ºC) = 80 ºC
- system height
=8m
- end pressure
= 3.0 bar
- Flexcon expansion vessel and boiler placed above.
Data
- capacity unknown
- boiler output
= 280 kW
- average heating temperature (80/60 ºC) = 70 ºC
- system height
= 12 m
- end pressure
= 3.0 bar
- Flexcon expansion vessel and boiler placed below.
- system components: 100% panel radiators
Calculation
Increase in volume in % = 2.89% ≈ 2.9%
340 x 2.9
Expansion volume = ––––––––– = 9.86 liters
100
Reserve 25% = 9.9 x 1.25 = 12.4 liters
(3.0 + 1) - (0.5 + 1)
Output = ––––––––––––––––– = 0.63
(3.0 + 1)
Calculation
Calculated system capacity = 280 x 8.8 = 2,464 liters
Increase in volume in % = 2.25%
2,464 x 2.25
Expansion volume = ––––––––––– = 55.4 liters
100
Reserve 25% = 55.4 x 1.25 = 69.3 liters
Required gross capacity of the
12.4
Flexcon expansion vessel = –––– = 19.7 liters
0.63
(3.0 + 1) - (1.5 + 1)
Output = –––––––––––––––– = 0.375
(3.0 + 1)
The ideal model is a Flexcon 25/0.5.
Required gross capacity of the
69.3
Flexcon expansion vessel = ––––– = 184.8 liters
0.375
The ideal model is a Flexcon 200/1.5.
24
Product overview • 2013
We reserve the right to change designs and technical specifications of our products.
1
Expansion Vessels
Theory
Minimum working pressure
Specific circulation pumps demand a certain pressure
(for instance 1 bar) in their suction pipe in order to
function properly. Many modern central heating
boilers are protected to a minimum working pressure
of 0.8 or 1 bar. If such a pump or boiler is built in to a
central heating system with a low static height, it may
be more sensible to set the initial pressure of the
expansion vessel to 1 bar rather than 0.5 bar.
Note that the increased initial pressure does not
ensure that the minimum working pressure is
replicated throughout the system! The chance of
negative pressure being created high up in the system
when it is cooling down, which would cause air
circulation problems, is greater if the initial pressure is,
say, 1 bar than if the initial pressure were set at 0.5
bar. If the pressure in the system drops below 1 bar,
expansion vessels with initial pressure of 1 bar cannot
give back water to the system as the expansion vessel
would run dry!
Boost pressure
In order to prevent negative pressure and air
circulation problems, it is of the greatest importance
that the expansion vessel does not run dry. This is
why Flamco recommends that you fill the system
when it is cold and at a pressure equal to the initial
pressure plus 0.2 to 0.3 bar (if you are topping up a
warmer system, the pressure must, accordingly, be
higher).
An incorrect, excessive boost pressure may lead to
problems. If the system in which a expansion vessel
is fitted and an initial pressure of 0.5 bar is filled to
2 bar rather than 0.8 bar, 30% more of the gross
capacity will already have been used up before the
central heating water expands due to the increase in
temperature!
(3 + 1) - (0.8 + 1)
 A = ––––––––––––––––– = 0.55 = 55%
(3.0 + 1)
(3 + 1) - (2 + 1)
 B = ––––––––––––––––– = 0.25 = 25%
(3 + 1)
Difference in output (): 30%
Conclusion
• A higher initial pressure in a expansion vessel does
not guarantee higher system pressure.
• An incorrect, excessive boost pressure has an undue
impact. Flamco recommends filling the system to
the right pressure, preferably 0.2 to 0.3 bar above
the initial pressure of the Flexcon expansion vessel
(when cold).
Assistance
• To make the correct calculation in respect of which
Flexcon expansion vessel to use, Flamco can offer
all sorts of assistance; we can provide technical
documentation, disc calculators and computer
programs.
N.B.: The right place for the expansion vessel is in the
system’s return line, on the suction side of the
circulation pump.
Product overview • 2013
We reserve the right to change designs and technical specifications of our products.
25
Vessel Calculation for Cooling Systems
In a cooling system, Flexcon expansion vessels may
have the following functions:
• As the system cools, the volume of the cooling water
shrinks. The Flexcon expansion vessel thus gives
water back to the system, maintaining system
pressure.
• If the system is turned off, the water can return to
the ambient temperature, allowing it to expand.
The vessel absorbs this expansion volume.
The Expansion Coefficient of Antifreeze
All Flexcon expansion vessels can be used in systems
in which glycol-based anti-freeze is added to the
system water.
The table below shows the increase in volume of
various water/ethylene glycol mixing ratios. These are
average values.
Expansion coefficient of water with and without added anti-freeze
Temperature
[°C]
Percentage of glycol
10
20
30
40
50
60
70
80
90
100
0%
10%
20%
30%
40%
50%
0.04
0.18
0.43
0.79
1.21
1.71
2.25
2.89
3.58
4.35
0.35
0.50
0.75
1.11
1.53
2.03
2.60
3.22
3.91
4.63
0.67
0.82
1.07
1.43
1.85
2.35
2.92
3.54
4.23
4.95
0.89
1.04
1.29
1.65
2.07
2.57
3.14
3.76
4.45
5.17
1.31
1.46
1.71
2.07
2.49
2.99
3.56
4.18
4.87
5.59
1.63
1.78
2.03
2.39
2.81
3.31
3.88
4.52
5.19
5.90
7
6
Volume Increase [%]
5
4
]
0
]
°C ]
30 5 °C ]
[
C
2
52
l.% [- 0 ° ]
vo l.% [-2 °C
44 9 vo l.% [-15 °C]
3 vo .% -10
l
34 vo .% [
ter
28 vol
wa
=
20
l.%
vo
0
l.%
2
0,44
0,13
°C
vo
3
0,78
[-4
1,31
1
0,64
0,28
0
-40
-30
-20
-10
0
10
20
30
40
50
60
70
Temperature [°C]
26
Product overview • 2013
We reserve the right to change designs and technical specifications of our products.
1
Expansion Vessels
Calculation for a Cooling System
The following data is required to calculate the required
volume of Flexcon expansion vessel:
• Volume of system water.
• Percentage of added anti freeze.
• Lowest system temperature.
• Maximum system temperature
(= highest ambient temperature).
• Water - anti-freeze mix expansion (percentage).
• Static height of the system above the vessel.
• Maximum working pressure.
The initial pressure of the expansion vessel is selected
to match the static height of the system (above the
expansion vessel). The following formula can be used
to calculate the fill level of the expansion vessel at the
lowest operating pressure.
lowest operating pressure - initial pressure
I –––––––––––––––––––––––––––––––––––––––– = fill level
lowest operating pressure
This means that the residual factor of the expansion vessel can be determined.
Residual factor = 1 - fill level.
The end pressure must be 0.5 bar lower than the set pressure of the safety valve.
The output is calculated using the formula below:
end pressure - lowest operating pressure
II –––––––––––––––––––––––––––––––––––––– x residual factor = output
end pressure
Note:
•
•
•
•
Pressure in bar absolute.
Max. output of Flexcon expansion vessels with fixed diaphragm 0.63.
Max. output of Flexcon 800 liter expansion vessel = 0/5, Flexcon 1.000 liter expansion vessel = 0/4.
Max. output of Flexcon M = 0.72.
The temperature in the Flexcon expansion vessel must remain above -10 ºC.
A buffer vessel or Flexcon intermediate expansion vessel may have to be fitted between the
system and the Flexcon expansion vessel.
For calculations of Flexcon expansion vessels for Solar installations, refer to the spreadsheet on
www.flamcogroup.com.
Product overview • 2013
We reserve the right to change designs and technical specifications of our products.
27
Flamco Flexcon
The Top in Pressure Expansion Vessels
Flamco’s standard programme covers a wide range of
expansion vessels from 2 - 8,000 liters with a wide
choice of pre-charge pressures and maximum
operating pressures. All models are characterised by
their construction, superior quality diaphragms or
bladders, high quality coating on the expansion
vessel itself and efficient production methods.
Why Flexcon is the best choice
• The rolling action of the diaphragm prevents
stretching.This has a significant impact on its
service life.
• The unique clamp construction damages neither the
diaphragm nor the two halves of the expansion
vessel.
• The thread of the water connection is uncoated to
ensure easy and water tight installation.
• All vessels are factory tested.
Flexcon expansion vessels
are delivered in a stackable
cardboard packaging with
hand grip and each box
contains clear assembly
instructions.
The two halves of the vessel are
coated prior to assembly.
Flexcon expansion vessels
are always in stock at our
wholesalers and our own
warehouses.
Qualified Flamco employees
will be happy to give you
advice and support. They
are just a telephone call
away.
FLEXCON 2 - 4
FLEXCON 8 - 25
Other reasons for choosing Flexcon
• Excellent service before, during and after
installation.
• Handy accessories for mounting or disconnecting
Flexcon expansion vessels.
• Our diaphragms are suitable for use with antifreeze. Exact details are available on request.
28
Product overview • 2013
FLEXCON 35 - 80
FLEXCON 110 - 1,000
• The nitrogen valve of Flexcon 8 - 80 litre expansion
vessels is countersunk and and is protected by a
dust cap and plastic cover.
• The two halves of the vessel are coated prior to
assembly.
We reserve the right to change designs and technical specifications of our products.
1
Expansion Vessels
4
4
2
6
3
5
6
2
3
1
5
1
1
Systems with Flexcon expansion
vessels
1. Flexcon expansion vessel.
2. Prescor Safety valve.
3. Flamco tundish.
4. Flamcovent or Flexair air separator.
5. Flexfast quick-release coupling.
6. Flexcon pressure gauge.
The diaphragm has a
extremely low permeability
The thread of the water
connection is uncoated to
ensure easy and water tight
installation.
The rolling action of the
diaphragm prevents stretching.
This has a significant
impact on its service life.
The unique clamp
construction damages
neither the diaphragm
nor the two halves of the
expansion vessel.
The nitrogen valve of Flexcon
8 - 80 litre expansion vessels is
countersunk and and is protected
by a dust cap and plastic cover.
When cold, the nitrogen
cushion presses the
diaphragm against the wall of
the Flexcon expansion vessel.
Product overview • 2013
When heated, the expansion
vessel partially fills with water
and the nitrogen gas is
compressed.
When heated further, the
expansion vessel portion
fully fills with water and the
nitrogen gas is fully
compressed.
If the pressure rises too high,
the Prescor valve opens.
The excess water/steam is
discharged.
We reserve the right to change designs and technical specifications of our products.
29
CONTRA-FLEX
For sealed heating and chilled water (cooling) installations.
When the temperature in the installation rises, the system water will expand. The ‘expansion water’ is stored temporarily in the
expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested.
• Diaphragm: Flexible rubber with rolling action.
• Suitable for addition of glycol-based anti-freeze up to 50%.
• Max. temperature on diaphragm (EN 13831/8): 70 °C.
• Max. temperature at (heating) outlet: 120 °C.
• In accordance with Pressure Equipment Directive 97/23/EC.
Contra-Flex W 8 - 35
• Maximum operating pressure: 3.0 bar.
• Deep drawn zinc plated steel clench ring.
• White (RAL 9010) epoxy powder coating.
Type
Contra-Flex W 8
Contra-Flex W 12
Contra-Flex W 18
Contra-Flex W 25
Contra-Flex W 35
Capa- Precity charge
[l]
[bar]
8
12
18
25
35
1.5
1.5
1.5
1.5
1.5
Dimensions
Ø
[mm]
H.
[mm]
245
286
328
358
396
304
336
328
380
439
Syst. Weight
conn. [kg]
(M)
/4"
/4"
3/ "
4
3/ "
4
3/ "
4
3
3
  2.2
  2.1
  3.7
  4.5
  5.4
Order
Code
50
36
24
18
18
26063
26153
26163
26233
26333
Nr. 0343
Contra-Flex W 50 - 80
• Maximum operating pressure: 6.0 bar.
• Deep drawn zinc plated steel clench ring.
• White (RAL 9010) epoxy powder coating.
Type
Contra-Flex W 50
Contra-Flex W 80
Capa- Precity charge
[l]
[bar]
50
80
1.5
1.5
Dimensions
Ø
[mm]
H.
[mm]
435
519
495
551
Syst. Weight
conn. [kg]
(M)
/4"
1"
3
11.2
15.0
Order
Code
12
12
26483
26783
Nr. 0343
Contra-Flex 100 - 200
• Maximum operating pressure: 6.0 bar.
• All welded construction.
• Red (RAL 3002) epoxy powder coating.
Type
Contra-Flex 100
Contra-Flex 200
30
Product overview • 2013
Capa- Precity charge
[l]
[bar]
  100
  200
2.5
2.5
Dimensions
Ø
[mm]
H.
[mm]
484
484
 784
1300
Syst. Weight
conn. [kg]
(M)
1"
1"
  23.8
  38.1
Order
Code
12
 1
26105
26215
Nr. 0343
We reserve the right to change designs and technical specifications of our products.
1
Expansion Vessels
FLEXCON C
For sealed heating and chilled water (cooling) installations.
When the temperature in the installation rises, the system water will expand. The ‘expansion water’ is stored temporarily in the
expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested.
• The diaphragm is clamped between two vessel halves, preventing mechanical damage to the diaphragm or vessel halves
during use. Compared to other bladder type vessels, the clamp ring construction cuts the air to water diaphragm surface
ratio in half, resulting in a much lower permeability of the gas charge, a greater reliability and overall life expectancy of the
vessel.
• The thread of the system connection is uncoated, ensuring problem free connection.
• Diaphragm: Flexible rubber with rolling action.
• Suitable for addition of glycol-based anti-freeze up to 50%.
• Red (RAL 3002) epoxy powder coating.
• Max. temperature on diaphragm (EN 13831/8): 70 °C.
• Max. temperature at (heating) outlet: 120 °C.
• In accordance with Pressure Equipment Directive 97/23/EC.
Flexcon C 2 - 25
• Maximum operating pressure: 3.0 bar.
• Deep drawn zinc plated steel clench ring.
Type
Flexcon C   2
Flexcon C   2
Flexcon C   4
Flexcon C   4
Flexcon C   8
Flexcon C 12
Flexcon C 18
Flexcon C 18
Flexcon C 25
Flexcon C 25
Capacity
[l]
Precharge
[bar]
 2
 2
 4
 4
 8
12
18
18
25
25
0,5
1.5
0,5
1.5
1.5
1.5
0,5
1.5
0,5
1.5
Dimensions
Ø
[mm]
H.
[mm]
216
194
194
194
245
286
328
328
358
358
152
152
257
257
304
336
328
328
380
380
Syst. Weight
conn. [kg]
(M)
/4"
/4"
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3
3
1,1
1.1
1,6
1.6
2.2
2.1
3.7
3.7
4.5
4.5
Order
Code
120
120
90
90
60
60
30
30
24
24
13211
13213
13411
13413
16077
16127
16175
16177
16245
16247
Nr. 0343
Flexcon C 35 - 80
• Maximum operating pressure: 3.0 bar.
• Deep drawn zinc plated steel clench ring.
Type
Flexcon C 35
Flexcon C 50
Flexcon C 50
Flexcon C 50
Flexcon C 50
Flexcon C 80
Flexcon C 80
Flexcon C 80
Flexcon C 80
Product overview • 2013
Capacity
[l]
Precharge
[bar]
35
50
50
50
50
80
80
80
80
1.5
0,5
1,0
1.5
1.5
0,5
1,0
1.5
1.5
Dimensions
Ø
[mm]
H.
[mm]
396
435
435
435
435
519
519
519
519
439
495
495
495
495
551
551
551
551
Syst. Weight
conn. [kg]
(M)
/4"
/4"
3/ "
4
3/ "
4
3/ "
4
1"
1"
1"
1"
3
3
  5.4
11.2
11.2
11.2
11.2
15.0
15.0
15.0
15.0
Order
Code
24
12
12
12
12
12
12
12
12
16347
16491
16492
16493
16493
16815
16816
16817
16817
Nr. 0343
We reserve the right to change designs and technical specifications of our products.
31
Flexcon C 110 - 1000
• Maximum operating pressure: 6.0 bar.
• All welded construction.
• Red (RAL 3002) epoxy powder coating.
Type
Flexcon C   110
Flexcon C   110
Flexcon C   110
Flexcon C   110
Flexcon C   140
Flexcon C   140
Flexcon C   140
Flexcon C   140
Flexcon C   200
Flexcon C   200
Flexcon C   200
Flexcon C   200
Flexcon C   300
Flexcon C   300
Flexcon C   300
Flexcon C   300
Flexcon C   425
Flexcon C   425
Flexcon C   425
Flexcon C   425
Flexcon C   600
Flexcon C   600
Flexcon C   600
Flexcon C   600
Flexcon C   800
Flexcon C   800
Flexcon C   800
Flexcon C 1000
Flexcon C 1000
Capacity
[litres]
Precharge
(bar)
  110
  110
  110
  110
  140
  140
  140
  140
  200
  200
  200
  200
  300
  300
  300
  300
  425
  425
  425
  425
  600
  600
  600
  600
  800
  800
  800
1000
1000
0.5
1.0
1.5
specify
0.5
1.0
1.5
specify
0.5
1.0
1.5
specify
0.5
1.0
1.5
specify
0.5
1.0
1.5
specify
0.5
1.0
1.5
specify
1.0
1.5
specify
1.5
specify
Dimensions
Ø
Height
[mm] (mm)
484
484
484
484
484
484
484
484
484
484
484
484
600
600
600
600
790
790
790
790
790
790
790
790
790
790
790
790
790
 784
 784
 784
 784
  950
  950
  950
  950
1300
1300
1300
1300
1330
1330
1330
1330
1180
1180
1180
1180
1540
1540
1540
1540
1888
1888
1888
2268
2268
Syst. Weight
conn. [kg]
(M)
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
  23,8
  23,8
  23,8
  23,8
  25,3
  25,3
  25,3
  25.3
  38,1
  38,1
  38,1
  38.1
  56,9
  56,9
  56,9
  56.9
  76,4
  76,4
  76,4
  76.4
  92,9
  92,9
  92,9
  92.9
126,9
126,9
126.9
145,9
145.9
8
8
8
8
8
8
8
8
8
8
8
8
6
6
6
6
1
1
1
1
1
1
1
1
1
1
1
1
1
Order
Code
17110
17111
17112
17114
17115
17116
17117
17119
17120
17121
17122
17124
17130
17131
17132
17134
17140
17141
17142
17144
17160
17161
17162
17164
17180
17181
17184
17190
17194
Nr. 0343
32
Product overview • 2013
We reserve the right to change designs and technical specifications of our products.
1
Expansion Vessels
FLEXCON
For sealed heating and chilled water (cooling) installations.
When the temperature in the installation rises, the system water will expand. The ‘expansion water’ is stored temporarily in the
expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested.
• All welded construction.
• Diaphragm: Flexible rubber with rolling action.
• Suitable for addition of glycol-based anti-freeze up to 50%.
• Red (RAL 3002) epoxy powder coating.
• Max. temperature on diaphragm (EN 13831/8): 70 °C.
• Max. temperature at (heating) outlet: 120 °C.
• In accordance with Pressure Equipment Directive 97/23/EC.
Flexcon 110 - 1000 - 6.0 bar
• Maximum operating pressure: 6.0 bar.
Type
Flexcon   110
Flexcon   110
Flexcon   110
Flexcon   110
Flexcon   110
Flexcon   110
Flexcon   140
Flexcon   140
Flexcon   140
Flexcon   140
Flexcon   140
Flexcon   140
Flexcon   140
Flexcon   200
Flexcon   200
Flexcon   200
Flexcon   200
Flexcon   200
Flexcon   200
Flexcon   200
Flexcon   300
Flexcon   300
Flexcon   300
Flexcon   300
Flexcon   300
Flexcon   300
Flexcon   300
Flexcon   425
Flexcon   425
Flexcon   425
Flexcon   425
Flexcon   425
Flexcon   425
Flexcon   425
Flexcon   600
Flexcon   600
Flexcon   600
Flexcon   600
Flexcon   600
Flexcon   600
Flexcon   600
Flexcon   800
Flexcon   800
Flexcon   800
Flexcon   800
Flexcon   800
Flexcon   800
Flexcon   800
Flexcon 1000
Flexcon 1000
Flexcon 1000
Flexcon 1000
Flexcon 1000
Flexcon 1000
Flexcon 1000
Product overview • 2013
Capa- Precity charge
[l]
[bar]
  110
  110
  110
  110
  110
  110
  140
  140
  140
  140
  140
  140
  140
  200
  200
  200
  200
  200
  200
  200
  300
  300
  300
  300
  300
  300
  300
  425
  425
  425
  425
  425
  425
  425
  600
  600
  600
  600
  600
  600
  600
  800
  800
  800
  800
  800
  800
  800
1000
1000
1000
1000
1000
1000
1000
0.5
1.0
1.5
2.0
2.5
specify
0.5
1.0
1.5
2.0
2.5
3.0
specify
0.5
1.0
1.5
2.0
2.5
3.0
specify
0.5
1.0
1.5
2.0
2.5
3.0
specify
0.5
1.0
1.5
2.0
2.5
3.0
specify
0.5
1.0
1.5
2.0
2.5
3.0
specify
0.5
1.0
1.5
2.0
2.5
3.0
specify
0.5
1.0
1.5
2.0
2.5
3.0
specify
Dimensions
Ø
[mm]
H.
[mm]
484
484
484
484
484
484
484
484
484
484
484
484
484
484
484
484
484
484
484
484
600
600
600
600
600
600
600
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
 784
 784
 784
 784
 784
 784
  950
  950
  950
  950
  950
  950
  950
1300
1300
1300
1300
1300
1300
1300
1330
1330
1330
1330
1330
1330
1330
1180
1180
1180
1180
1180
1180
1180
1540
1540
1540
1540
1540
1540
1540
1888
1888
1888
1888
1888
1888
1888
2268
2268
2268
2268
2268
2268
2268
Syst. Weight
conn. [kg]
(M)
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
  23.8
  23.8
  23.8
  23.8
  23.8
  23.8
  25.3
  25.3
  25.3
  25.3
  25.3
  25.3
  25.3
  38.1
  38.1
  38.1
  38.1
  38.1
  38.1
  38.1
  56.9
  56.9
  56.9
  56.9
  56.9
  56.9
  56.9
  76.4
  76.4
  76.4
  76.4
  76.4
  76.4
  76.4
  92.9
  92.9
  92.9
  92.9
  92.9
  92.9
  92.9
126.9
126.9
126.9
126.9
126.9
126.9
126.9
145.9
145.9
145.9
145.9
145.9
145.9
145.9
Order
Code
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
6
6
6
6
6
6
6
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
16115
16116
16117
16119
16120
16110
16145
16146
16147
16141
16142
16143
16140
16205
16206
16207
16208
16209
16210
16200
16301
16302
16303
16304
16305
16306
16300
16421
16422
16423
16424
16425
16426
16420
16601
16602
16603
16604
16605
16606
16600
16801
16802
16803
16804
16805
16806
16800
16901
16902
16903
16904
16905
16906
16900
We reserve the right to change designs and technical specifications of our products.
Nr. 0343
33
Flexcon 110 - 1000 - 10.0 bar
• Maximum operating pressure: 10.0 bar.
Type
Flexcon   110
Flexcon   110
Flexcon   110
Flexcon   110
Flexcon   110
Flexcon   110
Flexcon   110
Flexcon   140
Flexcon   140
Flexcon   140
Flexcon   140
Flexcon   140
Flexcon   140
Flexcon   140
Flexcon   200
Flexcon   200
Flexcon   200
Flexcon   200
Flexcon   200
Flexcon   200
Flexcon   200
Flexcon   300
Flexcon   300
Flexcon   300
Flexcon   300
Flexcon   300
Flexcon   300
Flexcon   300
Flexcon   425
Flexcon   425
Flexcon   425
Flexcon   425
Flexcon   425
Flexcon   425
Flexcon   425
Flexcon   600
Flexcon   600
Flexcon   600
Flexcon   600
Flexcon   600
Flexcon   600
Flexcon   600
Flexcon   800
Flexcon   800
Flexcon   800
Flexcon   800
Flexcon   800
Flexcon   800
Flexcon   800
Flexcon 1000
Flexcon 1000
Flexcon 1000
Flexcon 1000
Flexcon 1000
Flexcon 1000
Flexcon 1000
34
Product overview • 2013
Capa- Precity charge
[l]
[bar]
  110
  110
  110
  110
  110
  110
  110
  140
  140
  140
  140
  140
  140
  140
  200
  200
  200
  200
  200
  200
  200
  300
  300
  300
  300
  300
  300
  300
  425
  425
  425
  425
  425
  425
  425
  600
  600
  600
  600
  600
  600
  600
  800
  800
  800
  800
  800
  800
  800
1000
1000
1000
1000
1000
1000
1000
0.5
1.0
1.5
2.0
2.5
3.0
specify
0.5
1.0
1.5
2.0
2.5
3.0
specify
0.5
1.0
1.5
2.0
2.5
3.0
specify
0.5
1.0
1.5
2.0
2.5
3.0
specify
0.5
1.0
1.5
2.0
2.5
3.0
specify
0.5
1.0
1.5
2.0
2.5
3.0
specify
0.5
1.0
1.5
2.0
2.5
3.0
specify
0.5
1.0
1.5
2.0
2.5
3.0
specify
Dimensions
Ø
[mm]
H.
[mm]
484
484
484
484
484
484
484
484
484
484
484
484
484
484
600
600
600
600
600
600
600
600
600
600
600
600
600
600
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
790
 784
 784
 784
 784
 784
 784
 784
  950
  950
  950
  950
  950
  950
  950
  960
  960
  960
  960
  960
  960
  960
1330
1330
1330
1330
1330
1330
1330
1180
1180
1180
1180
1180
1180
1180
1540
1540
1540
1540
1540
1540
1540
1888
1888
1888
1888
1888
1888
1888
2268
2268
2268
2268
2268
2268
2268
Syst. Weight
conn. [kg]
(M)
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
  38.5
  38.5
  38.5
  38.5
  38.5
  38.5
  38.5
  44.6
  44.6
  44.6
  44.6
  44.6
  44.6
  44.6
  49.3
  49.3
  49.3
  49.3
  49.3
  49.3
  49.3
  73.7
  73.7
  73.7
  73.7
  73.7
  73.7
  73.7
105.5
105.5
105.5
105.5
105.5
105.5
105.5
132.0
132.0
132.0
132.0
132.0
132.0
132.0
182.0
182.0
182.0
182.0
182.0
182.0
182.0
210.0
210.0
210.0
210.0
210.0
210.0
210.0
Order
Code
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
16101
16102
16103
16104
16105
16106
16100
16131
16132
16133
16134
16135
16136
16130
16191
16192
16193
16194
16195
16196
16190
16291
16292
16293
16294
16295
16296
16290
16411
16412
16413
16414
16415
16416
16410
16591
16592
16593
16594
16595
16596
16590
16791
16792
16793
16794
16795
16796
16790
16891
16892
16893
16894
16895
16896
16890
Nr. 0343
We reserve the right to change designs and technical specifications of our products.
1
Expansion Vessels
FLEXCON TOP
For sealed heating and chilled water (cooling) installations.
When the temperature in the installation rises, the system water will expand. The ‘expansion water’ is stored temporarily in the
expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested.
• Diaphragm: Flexible rubber with rolling action.
• Suitable for addition of glycol-based anti-freeze up to 50%.
• Red (RAL 3002) epoxy powder coating.
• Max. operating pressure: 6.0 bar.
• Max. temperature on diaphragm (EN 13831/8): 70 °C.
• Max. temperature at (heating) outlet: 120 °C.
• In accordance with Pressure Equipment Directive 97/23/EC.
Flexcon Top 2 - 25
• Deep drawn zinc plated steel clench ring.
Type
Flexcon Top   8
Flexcon Top   8
Flexcon Top   8
Flexcon Top   8
Flexcon Top 12
Flexcon Top 12
Flexcon Top 12
Flexcon Top 12
Flexcon Top 18
Flexcon Top 18
Flexcon Top 18
Flexcon Top 18
Flexcon Top 25
Flexcon Top 25
Flexcon Top 25
Flexcon Top 25
Capacity
[l]
Precharge
[bar]
 8
 8
 8
 8
12
12
12
12
18
18
18
18
25
25
25
25
0.5
1.0
2.5
specify
0.5
1.0
2.5
specify
0.5
1.0
2.5
specify
0.5
1.0
2.5
specify
Dimensions
Ø
[mm]
H.
[mm]
245
245
245
245
286
286
286
286
328
328
328
328
358
358
358
358
280
280
280
280
313
313
313
313
306
306
306
306
359
359
359
359
Syst. Weight
conn. [kg]
(M)
/4"
/4"
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3
3
3.2
3.2
3.2
3.2
4.5
4.5
4.5
4.5
5.7
5.7
5.7
5.7
7.3
7.3
7.3
7.3
Order
Code
77
50
50
50
60
36
36
36
24
24
24
24
18
18
18
18
16008
16009
16010
16011
16012
16013
16014
16015
16018
16019
16020
16017
16025
16026
16027
16030
Nr. 0343
Flexcon Top 35 - 80
• Deep drawn zinc plated steel clench ring.
Type
Flexcon Top 35
Flexcon Top 35
Flexcon Top 35
Flexcon Top 35
Flexcon Top 35
Flexcon Top 50
Flexcon Top 50
Flexcon Top 50
Flexcon Top 50
Flexcon Top 50
Flexcon Top 80
Flexcon Top 80
Flexcon Top 80
Flexcon Top 80
Product overview • 2013
Capacity
[l]
Precharge
[bar]
35
35
35
35
35
50
50
50
50
50
80
80
80
80
0.5
1.0
1.5
2.5
specify
0.5
1.0
1.5
2.5
specify
0.5
1.5
2.5
specify
Dimensions
Ø
[mm]
H.
[mm]
396
396
396
396
396
435
435
435
435
435
519
519
519
519
416
416
416
416
416
473
473
473
473
473
540
540
540
540
Syst. Weight
conn. [kg]
(M)
/4"
/4"
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
3/ "
4
1"
1"
1"
1"
3
3
  8.8
  8.8
  8.8
  8.8
  8.8
11.2
11.2
11.2
11.2
11.2
15.0
15.0
15.0
15.0
Order
Code
18
18
18
18
18
12
12
12
12
12
12
12
12
12
16035
16036
16039
16037
16038
16051
16052
16050
16053
16054
16081
16085
16083
16084
We reserve the right to change designs and technical specifications of our products.
Nr. 0343
35
FLEXCON SOLAR
Expansion vessels for solar powered installations.
• Suitable for addition of glycol-based anti-freeze up to 50%.
• In accordance with Pressure Equipment Directive 97/23/EC.
Flexcon Solar 8 - 25
• Deep drawn zinc plated steel clench ring.
• White (RAL 9010) epoxy powder coating.
• Maximum operating pressure: 8.0 bar.
• Maximum temperature load on the diaphragm: 110 °C.
Type
Capacity
[l]
Precharge
[bar]
 8
12
18
25
2.5
2.5
2.5
2.5
Flexcon Solar   8
Flexcon Solar 12
Flexcon Solar 18
Flexcon Solar 25
Dimensions
Ø
[mm]
H.
[mm]
245
286
328
358
280
313
306
359
Syst. Weight
conn. [kg]
(M)
/4"
/4"
3/ "
4
3/ "
4
3
3
3.2
4.3
5.7
7.3
Order
Code
50
36
24
18
16060
16061
16062
16063
Nr. 0343
Flexcon Solar 35 - 80
• Deep drawn zinc plated steel clench ring.
• White (RAL 9010) epoxy powder coating.
• Maximum operating pressure: 8.0 bar.
• Maximum temperature load on the diaphragm: 110 °C.
Type
Capacity
[l]
Precharge
[bar]
35
50
80
2.5
2.5
2.5
Flexcon Solar 35
Flexcon Solar 50
Flexcon Solar 80
Dimensions
Ø
[mm]
H.
[mm]
396
435
519
416
473
540
Syst. Weight
conn. [kg]
(M)
/4"
/4"
1"
3
3
  8.8
11.2
15.0
Order
Code
18
12
12
16064
16065
16066
Nr. 0343
Flexcon Solar 110 - 1000
• All welded construction.
• Red (RAL 3002) epoxy powder coating.
• Maximum operating pressure: 10.0 bar.
• Maximum temperature load on the diaphragm (EN 13831/8): 70 °C.
Type
Flexcon Solar   110
Flexcon Solar   140
Flexcon Solar   200
Flexcon Solar   300
Flexcon Solar   425
Flexcon Solar   600
Flexcon Solar   800
Flexcon Solar 1000
36
Product overview • 2013
Capacity
[l]
Precharge
[bar]
  110
  140
  200
  300
  425
  600
  800
1000
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
Dimensions
Ø
[mm]
H.
[mm]
484
484
600
600
790
790
790
790
 784
  950
  960
1330
1180
1540
1888
2268
Syst. Weight
conn. [kg]
(M)
1"
1"
1"
1"
1"
1"
1"
1"
  38.5
  44.6
  49.3
  73.7
105.5
132.0
181.8
211.0
Order
Code
8
8
8
6
1
1
1
1
16067
16068
16069
16070
16071
16072
16073
16074
Nr. 0343
We reserve the right to change designs and technical specifications of our products.
1
Expansion Vessels
CUBEX R
For sealed heating and chilled water (cooling) installations.
When the temperature in the installation rises, the system water will expand. The expansion water is stored temporarily in the
expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested.
• Deep drawn zinc plated steel clench ring.
• Diaphragm: Flexible rubber with rolling action.
• Suitable for addition of glycol-based anti-freeze up to 50%.
• Max. operating pressure: 3.0 bar.
• Max. temperature on diaphragm (EN 13831/8): 70 °C.
• Max. temperature at (heating) outlet: 120 °C.
• In accordance with Pressure Equipment Directive 97/23/EC.
Cubex R
Type
Cubex R 12
Cubex R 14
Cubex R 18
Capa- Precity charge
[l]
[bar]
12
14
18
0.5
0.5
0.5
Dimensions
Ø
[mm]
H.
[mm]
387
387
387
133
153
183
Syst. Weight
conn. [kg]
(M)
/4"
/4"
3/ "
4
3
3
5.1
5.3
6.4
Order
Code
48
48
48
13212
13214
13218
Nr. 0343
FLEXCON P
Expansion vessel with reduced height and suspension eye for use in sealed heating and cooling installations.
When the temperature in the installation rises, the system water will expand. The expansion water is stored temporarily in the
expansion vessel to keep the pressure in the installation at the correct level. Each vessel is factory tested.
• The oval shape combined with the practical suspension eye enables quick and easy mounting, optimising the use of space.
• Thanks to the design no rest water remains in the vessel.
• Deep drawn zinc plated steel clench ring.
• Suitable for addition of glycol based anti freeze up to 50%.
• Red (RAL 3002) epoxy powder coating.
• Max. working pressure: 3.0 bar.
• Max. temperature on diaphragm (EN 13831): 90 °C.
• Max. temperature at (heating) outlet: 120 °C.
• Vessel of high tensile steel.
• Diaphragm material: butyl rubber.
• In accordance with Pressure Equipment Directive 97/23/EC.
Flexcon P
Type
Flexcon P 18
Flexcon P 25
Flexcon P 35
Flexcon P 50
Capa- Precity charge
[l]
[bar]
18
25
35
50
1.0
1.0
1.0
1.5
Dimensions
Ø
[mm]
H.
[mm]
387
435
435
515
226
256
333
344
Syst. Weight
conn. [kg]
(M)
/4"
/4"
3/ "
4
3/ "
4
3
3
  5.7
  7.7
  8.9
11.8
Order
Code
30
20
20
12
13316
13326
13336
13357
Nr. 0343
Product overview • 2013
We reserve the right to change designs and technical specifications of our products.
37
Flexcon M
A Flexcon M expansion vessel offers you
advantages in installations with big differences in
the static pressure and set pressure
of the safety valve.
All Flexcon M expansion vessels are fitted with an
exchangeable bladder. This bladder forms the
separation between the expansion water inside the
bladder and the nitrogen cushion.
The Flexcon M’s flange
construction allows you to
replace the butyl-rubber
bladder.
As an option, the
Flexcon M expansion
vessel can be fitted
with a Flexvent Super
Automatic Air Vent.
High efficiency means that
the capacity of the vessel is
used to best effect.
Each Flexcon M expansion
vessel is fitted with a
pressure gauge as standard.
From 2,800 litres all
Flexcon M expansion
vessels are fitted with
an adjustable foot.
FLEXCON M
Systems with more than one boiler:
1. Flexcon expansion vessel (depending on boiler capacity).
2. Prescor safety valve or Prescomano.
3. Flamco tundish.
4. Flexcon Connection Assembly ½".
5. Flexcon pressure gauge or combined pressure gauge/thermometer.
6. Flamco venting equipment.
7. One or more Flexcon M vessels.
8. Flamco pressurisation unit.
38
Product overview • 2013
We reserve the right to change designs and technical specifications of our products.
1
Expansion Vessels
FLEXCON M
For heating and chilled water (cooling) installations.
The vessel is equipped with a replaceable bladder made from high-quality butyl rubber in compliance with EN 13831/8.
Particular benefits of use are achieved in installations with large variations between static pressure and pre-set pressure of the
safety valve. Accessories to be ordered separately.
• Replaceable bladder.
• With inspection cover and pressure gauge.
• With height-adjustable feet (From 2,800 litres).
• Delivered ready for connecting to system.
• Suitable for addition of glycol-based anti-freeze up to 50%.
• Red (RAL 3002) epoxy powder coating.
• Max. temperature on diaphragm (EN 13831/8): 70 °C.
• Max. temperature at (heating) outlet: 120 °C.
• In accordance with Pressure Equipment Directive 97/23/EC.
• Material quality:
- ASTM/ISO: A181 class 60 / S235JRG2.
Flexcon M - 6.0 bar
• Maximum operating pressure: 6.0 bar.
Type
Flexcon M    80
Flexcon M   400
Flexcon M   600
Flexcon M   800
Flexcon M 1000
Flexcon M 1200
Flexcon M 1600
Flexcon M 2000
Flexcon M 2800
Flexcon M 3500
Flexcon M 5200
Flexcon M 6700
Flexcon M 8000
Capacity
[l]
   80
  400
  600
  800
1000
1200
1600
2000
2800
3500
5200
6700
8000
Dimensions
Ø
[mm]
H.
[mm]
  450
  750
  750
  750
  750
1000
1000
1200
1200
1200
1500
1500
1500
  770
1335
1755
2155
2710
1940
2440
2180
2780
3580
3560
4450
5090
Syst.
conn.
(M)
Weight
[kg]
1"
1 1/4"
1 1/4"
1 1/4"
1 1/2"
1 1/2"
1 1/2"
2"
2 1/2"
2 1/2"
2 1/2"
DN 100 *
DN 100 *
   40
 115
 145
  180
  215
  285
  340
  425
  510
  620
1050
1200
1410
Syst.
conn.
(M)
Weight
[kg]
1"
1 1/4"
1 1/4"
1 1/4"
1 1/2"
1 1/2"
1 1/2"
1 1/2"
2"
2 1/2"
2 1/2"
2 1/2"
DN 100 *
DN 100 *
   40
  160
  200
  250
  300
  385
  410
 485
  600
  725
  900
1330
1690
2140
Order
Code
1
1
1
1
1
1
1
1
1
1
1
1
1
22101
22104
22105
22106
22107
22108
22109
22110
22118
22111
22112
22113
22114
* Flanges as per EN 1092-1 PN 16.
Flexcon M - 10.0 bar
• Maximum operating pressure: 10.0 bar.
Type
Flexcon M    80
Flexcon M   400
Flexcon M   600
Flexcon M   800
Flexcon M 1000
Flexcon M 1000
Flexcon M 1200
Flexcon M 1600
Flexcon M 2000
Flexcon M 2800
Flexcon M 3500
Flexcon M 5200
Flexcon M 6700
Flexcon M 8000
Capacity
[l]
   80
  400
  600
  800
1000
1000
1200
1600
2000
2800
3500
5200
6700
8000
Dimensions
Ø
[mm]
H.
[mm]
  450
  750
  750
  750
  750
1000
1000
1000
1200
1200
1200
1500
1500
1500
  770
1335
1755
2155
2710
1690
1940
2440
2180
2780
3580
3600
4480
5090
Order
Code
1
1
1
1
1
1
1
1
1
1
1
1
1
1
22141
22144
22145
22146
22147
22155
22148
22149
22150
22158
22151
22152
22153
22154
* Flanges as per EN 1092-1 PN 16.
Product overview • 2013
We reserve the right to change designs and technical specifications of our products.
39
Flexcon Pro
A Flexcon Pro expansion vessel offers you
extra-special advantages in installations with big
differences in the static pressure and set pressure
of the safety valve.
Diaphragm pressure expansion vessel with an
exchangeable bladder according to DIN 4807/3.
For the use in heating installations with a working
temperature of 120 °C (maximum temperature
(bladder) of 70 °C) and for chilled water (cooling and
airconditioning) installations.
From 770 liters or more the Flexcon
Pro expansion vessels are fitted with a
pressure gauge.
High efficiency means that the
capacity of the expansion vessel is
used to best effect.
Thanks to its threaded connection,
a Flexcon Pro expansion vessel
can be installed easily and costeffectively onto the system.
FLEXCON PRO
6
2
3
4
1
40
5
Product overview • 2013
7
8
Systems with more than one boiler:
1. Flexcon expansion vessel (depending on boiler capacity).
2. Prescor safety valve or Prescomano.
3. Flamco tundish.
4. Flexcon Connection Assembly ½".
5. Flexcon pressure gauge or combined pressure gauge/thermometer.
6. Flamco venting equipment.
7. One or more Flexcon M vessels.
8. Flamco automatic top-up unit.
We reserve the right to change designs and technical specifications of our products.
1
Expansion Vessels
FLEXCON PRO
For heating and chilled water (cooling) installations.
• Replaceable bladder.
• Red (RAL 3002) epoxy powder coating.
• Suitable for addition of glycol-based anti-freeze up to 50%.
• Max. operating pressure: 6.0 bar.
• Max. temperature on diaphragm (EN 13831/8): 70 °C.
• Max. temperature at (heating) outlet: 120 °C.
• In accordance with Pressure Equipment Directive 97/23/EC.
• Material quality: ASTM/ISO: A181 class 60 / S235JRG2.
Flexcon PRO
Type
Flexcon PRO   200
Flexcon PRO   250
Flexcon PRO   300
Flexcon PRO   370
Flexcon PRO   430
Flexcon PRO   540
Flexcon PRO   650
Flexcon PRO   770
Flexcon PRO   870
Flexcon PRO 1000
Product overview • 2013
Capa- Precity charge
[l]
[bar]
  200
  250
  300
  370
  430
  540
  650
  770
  870
1000
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
Dimensions
Ø
[mm]
H.
[mm]
550
550
550
650
750
750
750
750
750
750
1150
1400
1650
1350
1170
1420
1670
1950
2200
2450
Syst. Weight
conn. [kg]
(M)
1"
1"
1"
1"
1"
1"
1"
1"
1"
1"
 47
 55
  63
 74
 87
108
125
153
172
180
Order
Code
1
1
1
1
1
1
1
1
1
1
25420
25425
25430
25431
25443
25454
25465
25477
25487
25500
We reserve the right to change designs and technical specifications of our products.
41
Flexcon VSV/VB Intermediate Vessels
In sealed heating systems, the supply temperature can
reach 120 °C.
The maximum permissible continuous temperature
load on the diaphragm in the Flexcon vessels is 70 °C
in compliance with the appropriate standard. That is
why Flexcon expansion vessels must be fitted in the
return line.
If the temperature in the return line is not capped at
70 °C, an intermediate vessel must be fitted.
System water flows from
the installation into the top
of the intermediate vessel.
In this intermediate vessel the expansion water is
allowed to cool.
The maximum supply temperature of the water for
Flexcon VSV/VB vessels is 160 °C. The extent to
which the expansion water is cooled depends on the
volume of the intermediate vessel.
An intermediate vessel must not be insulated.
Around the vessel and between the vessel and the
ceiling there must be clearance of at least 400 mm.
Calculation for a Flexcon VSV/VB intermediate
vessel
The required volume of a Flexcon VSV/VB intermediate
vessel depends on the supply temperature and a
percentage of the net expansion volume as per the
table below.
Supply temperature
The hot water mixes in the
vessel with the cold water
already in the vessel.
From the bottom of the
vessel, significantly cooler
water is fed into the
expansion vessel.
The temperature of the
expansion water that is
supplied to the Flexcon
expansion tank remains
under the maximum
temperature permissible
for the membrane.
Flexcon intermediate vessel volume
% of the net expansion volume
15
25
40
60
90 - 110 °C
111 - 125 °C
126 - 140 °C
141 - 150 °C
Example calculation for a Flexcon intermediate
vessel
Data:
- expansion volume
- supply temperature (105/95 °C)
= 1.740 litres
= 105 °C
Calculation:
Required vessel volume = 15% of the expansion
volume
15 x 1.740
= ––––––––––– = 261 litres
100
The ideal intermediate vessel is thus the Flexcon
VSV 350.
Flexcon intermediate vessel connection diagram
The intermediate vessel functions according to the
principle that hot water is lighter than cold water.
As the intermediate vessel is filled with water from the
top, the heat will be concentrated there.
System water that has been allowed to cool will,
due to its greater density, fall and this cooler water will
naturally be forced towards the connection on the
underside of the expansion vessel.
(Automatic)
Vent
FLEXCON VSV
Drain
42
Product overview • 2013
Expansion
line
We reserve the right to change designs and technical specifications of our products.
1
Expansion Vessels
FLEXCON INTERMEDIATE VESSELS
Vessels to protect Flexcon expansion vessels on elevated temperature systems.
The vessels are fitted in between the expansion vessel and the system return.
• Red (RAL 3002) epoxy powder coating.
• Suitable for addition of glycol-based anti-freeze up to 50%.
• In accordance with Pressure Equipment Directive 97/23/EC.
• Material quality: ASTM/ISO: A181 class 60 / S235JRG2.
Flexcon VSV - 6.0 bar
• Maximum working temperature (design): 160 °C.
Type
Flexcon VSV   200
Flexcon VSV   350
Flexcon VSV   500
Flexcon VSV   750
Flexcon VSV 1000
Capacity
[l]
  200
  350
  500
  750
1000
Dimensions
Ø
[mm]
Connection to Weight
[kg]
H.
Vessel System
[mm]
(F)
(F)
484
484
600
790
790
1304
2124
2025
1863
2238
1 1/2"
1 1/2"
2"
2"
2"
1 1/2"
1 1/2"
2"
2"
2"
  36
 55
 64
 96
114
Order
Code
1
1
1
1
1
23380
23381
23382
23383
23384
Nr. 0343
Flexcon VSV - 10.0 bar
• Maximum working temperature (design): 160 °C.
Type
Flexcon VSV   200
Flexcon VSV   350
Flexcon VSV   500
Flexcon VSV   750
Flexcon VSV 1000
Capacity
[l]
  200
  350
  500
  750
1000
Dimensions
Ø
[mm]
Connection to Weight
[kg]
H.
Vessel System
[mm]
(F)
(F)
484
484
600
790
790
1304
2124
2025
1863
2238
1 1/2"
1 1/2"
2"
2"
2"
1 1/2"
1 1/2"
2"
2"
2"
 51
  80
 96
142
172
Order
Code
1
1
1
1
1
23300
23301
23302
23303
23304
Nr. 0343
Flexcon V-B - 6.0 bar
• Maximum working temperature (design): 120 °C.
Type
V-B 1600
V-B 2000
Capacity
[l]
1600
2000
Dimensions
Connection
Ø
[mm]
H.
Vessel System
[mm]
(M)
(F)
1000
1200
2480
2220
1 1/2"
2"
1 1/2"
2"
Weight
[kg]
340
425
Order
Code
1
1
22717
22718
Flexcon V-B - 10.0 bar
• Maximum working temperature (design): 160 °C.
Type
V-B 1600
V-B 2000
Product overview • 2013
Capacity
[l]
1600
2000
Dimensions
Connection
Ø
[mm]
H.
Vessel System
[mm]
(M)
(F)
1000
1200
2700
2435
1 1/2"
2"
1 1/2"
2"
Order
Code
1
1
22737
22738
We reserve the right to change designs and technical specifications of our products.
43