Elster Kromschroder VMF Series Manual

3.1.0.20 Edition 02.11
Technical Information · GB
www.kromschroeder.com
• Safe gas cleaning using filter pad and strainer
• Easy installation into a system in conjunction with valVario valves and
regulators
• Installation in any position, even with optional pressure switch
Filter module VMF

VMF · Edition 02.11
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t = To be continued
Contents
Filter module VMF ................................ 1
Contents........................................2
1 Application.....................................3
1.1 Examples of application. . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1.1 valVario double block valve with pressure regulator VCD
and VMF fitted to a forced draught burner . . . . . . . . . . . . . . . . . 4
1.1.2 valVario double block valve with variable air/gas ratio
control VCV and VMF fitted to a forced draught burner . . . . . . . 4
1.1.3 Industrial burner with staged control. . . . . . . . . . . . . . . . . . 4
1.1.4 Industrial burner with continuous control . . . . . . . . . . . . . . .5
2 Function.......................................6
3 Flow rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Calculating the nominal size . . . . . . . . . . . . . . . . . . . . . 7
4 Selection ......................................8
4.1 Type code.....................................8
5 Project planning information . . . . . . . . . . . . . . . . . . . . . . 9
5.1 Installation ....................................9
6 Accessories...................................10
6.1 Seal set VA 1 – 3 ...............................10
6.2 Filter pad set .................................10
7 Technical data..................................11
7.1 Dimensions................................... 12
7.1.1 VMF..R...........................................12
7.1.2 VMF..N ..........................................13
7.1.3 VMF 240F........................................14
8 Maintenance.................................. 15
Feedback ...................................... 16
Contact........................................ 16

VMF · Edition 02.11
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Application
1 Application
VMF2..1-4 VMF2..R..M
The filter module VMF is designed for cleaning the gas and air
flow to gas burners or gas appliances. It is suitable for use in
gas control and safety systems in all sectors of the iron, steel,
glass and ceramics industries, and also in all areas of private
and commercial heat generation.
It can easily be adapted to different pipes thanks to various
flange shapes for the individual valVario valve sizes. Its modu-
lar design allows assembly with valVario valves or regulators
making it possible to construct space-saving gas systems.
Forced draught gas burner with valVario controls
Roller hearth furnace

VMF · Edition 02.11
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1.1 Examples of application
1.1.1 valVario double block valve with pressure regulator VCD
and VMF fitted to a forced draught burner
VCD
VMF
This type of control is used on one-stage forced draught burn-
ers or in one-stage boilers, it is also suitable for use with a
mechanical or electronic air/gas ratio control system.
1.1.2 valVario double block valve with variable air/gas ratio
control VCV and VMF fitted to a forced draught burner
VCV pF
pL
VMF
With this type of continuous control, the mixture setting is
maintained over a wide control range while at the same time
preventing air deficiency.
1.1.3 Industrial burner with staged control
VAG
+VBY BIC
AKT
IC 40 + BVA
M
LEH
EKO
EKO
VMV
VMF VAS
The high output impulse at the burner generated by this type
of control produces a uniform temperature distribution and
good circulation of the furnace or kiln atmosphere, e.g. in heat
treatment furnaces in the iron and non-ferrous metal industries
or kilns for heavy clay and fine ceramics. The required lambda
value can be set using the fine-adjusting valve VMV and the
air adjusting cock LEH. Using the filter module VMF, the gas
flow upstream of the gas valve VAS is cleaned.
Application

VMF · Edition 02.11
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1.1.4 Industrial burner with continuous control
IC 20 + BVA
VAG
M
BVA
VAS
ZIO, BIO, BIOA
LEH
EKO
EKO
VMV
VMF
Three-
point
step
Using the filter module VMF, the gas flow upstream of the
gas valve VAS and the air/gas ratio control VAG is cleaned.
The gas/air mixture is set using the fine-adjusting valve VMV.
A constant mixture setting is maintained over a wide control
range while at the same time preventing air deficiency. This
type of control is used on boilers with multi-stage or infinitely
adjustable forced draught burners.
Application > Examples of application

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2 Function
Base plate
Retaining frame
with strainer
Filter pad Housing
Pressure test point
Flange
VMF..M with test points
There is a retaining frame with an integrated strainer and filter
pad in the housing of the VMF. The filter pad is supported by
the strainer. The filter pad and the strainer rid the gas of coarse
as well as fine impurities.
In order to replace the filter pad, the two retaining screws are
undone and the base plate removed. The retaining frame with
the filter pad is pulled out. The retaining frame is opened and
the filter pad can be taken out.
The VMF is delivered with two test points for pressure measure-
ment as standard. The VMF can also optionally be delivered
with two 1/8“ screw plugs.
NO
NC
COM
Base plate
Retaining frame
with strainer
Filter pad Housing
Pressure test point
Pressure switch DG..VC
Flange
VMF..1 to 4 with pressure switch DG..VC
The VMF..1 to 4 is equipped with a pressure switch for moni-
toring minimum or maximum pressure. The pressure switch
monitors the outlet pressure downstream of the filter pad. In
addition, there is also a test point for measuring the pressure
directly.

VMF · Edition 02.11
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0,1
0,2
0,3
0,4
0,5
0,6
0,8
21 3 4 6 8 10 20 30 40
1
0,8 1 2 3 4 6 8 10 20 30 40
3
0,7 1 2 3 4 6 8 10 20 30
200 300 500
200 300
100 200 300
2
60 100
60 100
40 60
1
2
3
4
5
6
8
10
20
VMF 110
∆p [mbar]
V
'
n [m3/h]
VMF 115
VMF 120
VMF 125
VMF 225
VMF 232
VMF 250
VMF 240
0,2
0,3
0,4
0,5
0,6
0,8
1
0,4
0,5
0,6
0,8
1
2
3
4
5
6
8
∆p [inch WC]
30 40 60 100 200 10000400 2000 3000 5000600 1000
1
V
'
[SCFH]
Standard T-product
Flow rate (V
·
n)
Inlet pressure pe
∆pmax.
Medium temperature
Flow rate (V
·
b)
Product
3.1 Calculating the nominal size
 = natural gas (ρ = 0.80 kg/m3)
 = propane (ρ = 2.01 kg/m3)
 = air (ρ = 1.29 kg/m3)
The characteristic curves are measured at
15°C (59°F) with a measurement set-up in ac-
cordance with the standards EN 13611/EN 161.
This involves measuring the pressure 5 x DN
upstream and downstream of the unit under
test. The pressure drop of the pipe is also
measured but is not compensated for.
A pressure loss of 10 mbar must not be ex-
ceeded.
Reading instructions:
Should operating cubic metres (V
·
b) have
been used in the flow rate diagram, instead
of standard cubic metres (V
·
n), then the pres-
sure loss read must be multiplied by the
absolute inlet pressure in bar (1+positive
pressure in bar).
Example:
inlet pressure pe (positive pressure) = 0.4bar,
gas type: natural gas,
operating flow rate V
·
b = 15 m3/h,
selected filter module: VMF 120
∆p from diagram = 3.1 mbar,
∆p = 3.1 mbar x (1 + 0.4) = 4.5 mbar.
The VMF 120 has been selected correctly.
3 Flow rate
∆p v
●
Natural gas
0.80
kg/m3
20.9
m3/h
400
10.0
mbar
mbar
0
°C
15.0
m3/h
[mbar]
[m/s]
VMF 110 | 9.2| 29
VMF 115 | 4.5| 18
VMF 120 | 1.3| 11
VMF 125 | 0.8| 7
VMF 225 | 0.4| 7
VMF 232 | 0.2| 4
VMF 240 | 0.1| 3

VMF · Edition 02.11
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4 Selection
Type – 10 15 20 25 32 40 50 /–* /10* /15* /20*/25*/32*/40*/50* R N F 1) 05 M P 1 2 3 4
VMF 1                   
VMF 2                    

= standard,  = available
* Specifi cation omitted, if the nominal diameter of the inlet and outlet fl anges is the same.
1)
Only available for VMF 240.
4.1 Type code
Code Description
VMF Filter module
1–2 Size
–
10–50
Without inlet fl ange
Nominal inlet diameter
/–
/10–/50
Without outlet fl ange*
Nominal outlet diameter
R
N
F
Rp internal thread
NPT internal thread
Flange to ISO 7005
05 pe max 500 mbar
M
P
With pressure test points
With screw plugs
1
2
3
4
With outlet pressure switch: DG 17/VC
DG 40/VC
DG 110/VC
DG 400/VC
* Specifi cation omitted, if the nominal diameter of the inlet and outlet
fl anges is the same.

VMF · Edition 02.11
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5 Project planning information
5.1 Installation
Installation position: VMF can be installed as required.
We recommend installation with the base plate pointing
downwards or sideways so that dirt can be removed from
the housing more easily.
Installation position when using valVario valves and regulators:
the VMF is fitted upstream of the valVario control.
The VMF can be installed as a standalone device in the pipe.

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6 Accessories
6.1 Seal set VA 1 – 3
A B
D
C
Scope of delivery:
A 1 x double block seal,
B 2 x O-rings (flange),
C 2 x O-rings (pressure switch),
D 2 x sealing rings (test point).
6.2 Filter pad set
AB
C
DE
Scope of delivery:
A 1 x retaining frame with strainer,
B 10 x filter pads,
C 10 x seals for the base plate,
D 2 x seals for 1/8” test points,
E 2 x screws for securing the base plate.

VMF · Edition 02.11
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7 Technical data
Gas types:
natural gas, LPG (gaseous), biologically produced methane
(max. 0.1 %-by-vol. H2S) or air; other gas types on request.
The gas must be dry in all conditions and must not contain
condensate.
Max. inlet pressure pe:
max. 500 mbar (7.25 psig).
Ambient temperature:
-20 to +60°C (-4 to +140°F),
no condensation permitted.
Storage temperature:
-20 to +40°C (-4 to 104°F).
Housing: aluminium.
Connection flanges:
with internal thread: Rp to ISO 7-1, NPT to ANSI/ASME,
with ISO flange: DN 40 to ISO 7005.

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L1
D
F
H1
H2
L1
D
F
H3
H2
VMF..R..M, VMR..R..P VMF..R..1-4
7.1 Dimensions
7.1.1 VMF..R
Type Connection
Dimensions Weight
L1 F D H1 H2 H3 VMF..R..P*,
VMF..R..M* VMF..N..1-4* Flange
Rp DN mm mm mm mm mm mm kg kg kg
VMF 110 3/8 10 30 15 62.7 65.1 44.6 99 0.34 0.49 0.07
VMF 115 1/2 15 30 15 62.7 65.1 44.6 99 0.34 0.49 0.06
VMF 120 3/4 20 30 23 62.7 65.1 44.6 99 0.34 0.49 0.11
VMF 125 1 25 30 23 62.7 65.1 44.6 99 0.34 0.49 0.09
VMF 225 1 25 34 29 88 81 65.2 114.6 0.76 0.91 0.29
VMF 232 11/4 32 34 29 88 81 65.2 114.6 0.76 0.91 0.26
VMF 240 11/2 40 34 29 88 81 65.2 114.6 0.76 0.91 0.29
VMF 250 2 50 34 29 88 81 65.2 114.6 0.76 0.91 0.22
* Without fl anges.
Technical data

VMF · Edition 02.11
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L1
D
F
H1
H2
L1
D
F
H3
H2
VMF..N..M, VMR..R..P VMF..N..1-4
7.1.2 VMF..N
Type Connection
Dimensions Weight
L1 F D H1 H2 H3 VMF..N..P*.
VMF..N..M* VMF..N..1-4* Flange
NPT DN inch inch inch inch inch inch lbs lbs lbs
VMF 110 3/8 10 1.18 0.59 2.46 2.56 1.76 3.89 0.75 1.08 0.15
VMF 115 1/2 15 1.18 0.59 2.46 2.56 1.76 3.89 0.75 1.08 0.14
VMF 120 3/4 20 1.18 0.91 2.46 2.56 1.76 3.89 0.75 1.08 0.23
VMF 125 1 25 1.18 0.91 2.46 2.56 1.76 3.89 0.75 1.08 0.20
VMF 225 1 25 1.34 1.14 3.46 3.19 2.57 4.51 1.66 2.01 0.64
VMF 232 11/4 32 1.34 1.14 3.46 3.19 2.57 4.51 1.66 2.01 0.57
VMF 240 11/2 40 1.34 1.14 3.46 3.19 2.57 4.51 1.66 2.01 0.65
VMF 250 2 50 1.34 1.14 3.46 3.19 2.57 4.51 1.66 2.01 0.49
* Without fl anges.
Technical data > Dimensions

VMF · Edition 02.11
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L1
F
D
H1
H2
VMF 240/40F..M, VMF 240/40F..P
L1
F
H3
H2
VMF 240/40F..1-4
Technical data > Dimensions
7.1.3 VMF 240F
Type Connection
Dimensions Weight
L1 F D H1 H2 H3 VMF..F..P*,
VMF..F..M* VMF..F..1-4* Flange
DN mm mm mm mm mm mm kg kg kg
VMF 240 40 34 66 88 81 65.2 114.6 0.76 0.91 1.04
* Without fl anges and connection parts.

VMF · Edition 02.11
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8 Maintenance
Check for external tightness at least once per annum, at least
twice per annum for operation with biologically produced
methane. Replace filter pad as required, see page 10 (Filter
pad set).

VMF · Edition 02.11
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Postfach 2809 · 49018 Osnabrück
Strotheweg 1 · 49504 Lotte (Büren)
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www.kromschroeder.com
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