Industrial & Commercial Thermal
Fine-adjusting valve VMV
Technical Information · GB
3 Edition 02.10l
• Precise setting via a slide valve optimized for linear flow
• Tamper-proof thanks to self-locking thread
• Easy installation into a system in conjunction with valVario valves
and regulators

Table of contents
Fine-adjusting valve VMV . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table of contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Examples of application . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1.1 Staged control with pneumatic ratio control system . 4
1.1.2 Continuous control with pneumatic ratio control
system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1.4 Continuous control of a self recuperative burner . . . . . 5
2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Flow rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 kV value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Type code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5 Project planning information . . . . . . . . . . . . . . . . . . . . 10
5.1 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.1 Seal set VA 1 – 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1.1 VMV with Rp internal thread . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1.2 VMV with NPT internal thread . . . . . . . . . . . . . . . . . . . . . . . . 14
8 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
VMV · Edition 02.10l
▼
= To be continued
2
Application
1 Application
Fine-adjusting valve VMV for presetting the gas and air
flow rate to gas burners or gas appliances. For use in
gas control and safety systems in all sectors of the iron,
steel, glass and ceramics industries, and also in commercial heat generation.
Bogie hearth furnace
It can easily be adapted to different pipes thanks to the
selection of various flanges for individual valve sizes.
The modular design allows the individual assembly with
valVario valves or regulators making it possible to construct space-saving gas systems.
Roller hearth furnace
VMV · Edition 02.10l
3
Application
1.1 Examples of application
1.1.1 Staged control with pneumatic ratio control system
1.1.2 Continuous control with pneumatic ratio control
system
VAS
EKO
VAG
+VBY
BIC
IC 40 + BVA
M
Threepoint
step
ZIO, BIO, BIOA
LEH
EKO
M
IC 20 + BVA
EKO
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.
VMV · Edition 02.10l
EKO
VAG
VMV
AKT
VMV
LEH
BVA
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 in melting
furnaces in the aluminium industry or in regenerative
incineration installations in the environment industry,
for example.
1.1.3
4
Application
1.1.4 Continuous control of a self recuperative burner
DG GVRH
VMV
AKT
GFK
EKO
ECOMAX
DG
M
IC 40 + BVA VMO
EKO
BVA
The air flow rate is measured by a measuring orifice
VMO and the GVRH controls the gas flow rate proportionally. The required lambda value can be set using the
fine-adjusting valve VMV.
VMV · Edition 02.10l
5
Function
2 Function
Retaining frame
Slide valve
Adjusting screw
There is a retaining frame with an adjusting screw and
a slide valve in the housing of the VMV. The retaining
frame features an opening specially designed for linear
flow which is opened and closed by the slide valve. The
slide valve is exactly positioned using the adjusting
screw and thereby the required flow volume is released.
VMV · Edition 02.10l
6
Flow rate
32
24
20
16
VM
V
VM 110
V
VM 115
V
VM 120
V1
2
VM 5
V2
VM 25
VMV 23
VM V 242
V2 0
50
100
80
60
50
40
30
10
8
20
4
10
3
2.5
2
1.6
8
1.2
3
0.8
2
0.4
VM
VMV 110
VMV 115
VMV 120
V1
25
VM
VMV 22
5
VMV 23
2
VMV 24
V2 0
50
40
∆p [mbar]
∆p [inch WC]
3 Flow rate
6
5
4
1 1
2
3
0,1
0,2
0,3
0,07 0,1
1
0,1
4 5 6
0,2
0,2
8 10
0,3
0,5
0,8 1
0,3
0,5
0,5
20
2
50
4
2
0,8 1
30
3
0,8 1
2
70
100
6
3
3
10
4
20
6
4
6
200
300
 = natural gas, dv = 0.62,  = LPG, dv = 1.56,
 = air, dv = 1.00
The characteristic curves are measured at 15°C (59°F)
with a measurement set-up in accordance with the
standards EN 13611/EN 161.
30
10
10
20
20
500 700 1000
30
50
100
30
60
60
2000 3000
200
100
100
5000
400
200
200
10000
1000
400
400
20000
2000
1000
1000
50000
2000
2000 3000
V' [m3/h (n)]
100000
V' [SCFH]
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.
Left curve: Closed position leakage volume.
Right curve: Max. flow rate when 100% open.
VMV · Edition 02.10l
7
Flow rate
3.1 kV value
The size and nominal flange diameter are determined
using the flow rate diagram or by calculation using
the k v value.
= Flow rate (standard state) [m3/h]
V·(n)
kV = Valve coefficient (see table)
∆p = Pressure loss [bar]
Example
We want to find the size and nominal flange diameter
for a fine-adjusting valve VMV.
We have the maximum flow rate V·
, the outlet
(n) max
pressure pa and the temperature T for the medium of
natural gas.
pa = Outlet pressure (absolute) [bar]
V·(n) max. = 37 m3/h
ρn = D
ensity [kg/m3] (air 1.29/natural gas 0.80/propane 2.01/
butane 2.71)
∆pmax. = 0.01 bar (desired)
T = Medium temperature (absolute) [K]
pa = 30 mbar = 0.03 bar ⇒
pa absolute = 0.03 bar + 1 bar = 1.03 bar
T = 20°C ⇒
Tabsolute = 20 + 273 K = 293 K
kv =
37
·
514
0.83 · 293
0.01 · 1.03
= 11.1 m3/h
The fine-adjusting valve with the next higher k v value is
to be selected (see table): VMV 115.
VMV
VMV 110
VMV 115
VMV 120
VMV 125
VMV 225
VMV 232
VMV 240
VMV 250
VMV · Edition 02.10l
kV max. [m3/h]
kV min. [m3/h]
8,3
11,4
17,7
17,7
33,0
47,0
47,0
47,0
0,15
0,15
0,15
0,15
0,56
0,56
0,56
0,56
8
Selection
4 Selection
Typ
– 1) 10 15 20
VMV 1
   
VMV 2

 = standard,  = available
25


32
40


50 /10 /15 /20 /25 /32 /40 /50 R
   


    
N


F 05 M
  
  
P


Order example
VMV 125/25R05P
1) Not in conjunction with outlet fl ange.
4.1 Type code
Code
VMV
1–2
–
10–50
/10–/50
R
N
F
05
M
P
VMV · Edition 02.10l
Description
Fine-adjusting valve
Size
Without inlet and outlet fl ange
Nominal diameter in DN: Inlet fl ange
Outlet fl ange
Rp internal thread
NPT internal thread
Flange to ISO 7005
pe max 500 mbar
With pressure test points
With screw plugs
9
Project planning information
5 Project planning information
5.1 Installation
rio control or can be fitted as a standalone device in the
pipe, as required.
Installation position: VMV can be installed as required.
When fitting to pressure regulator VAD, VAG or VAV, the
base plate must be facing the same direction as the
regulator body.
Installation position when using valVario controls: VMV
can be installed upstream or downstream of the valVaVMV · Edition 02.10l
10
Accessories
6 Accessories
6.1 Seal set VA 1 – 3
A
B
C
D
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).
VMV · Edition 02.10l
11
Technical data
7 Technical data
Types of gas: natural gas, LPG (gaseous), biologically
produced methane (max. 0.1 %-by-vol. H2S) or air;
other gases 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: 0 to +40°C (-4 to +104°F).
Housing: aluminium.
Connection flanges with internal thread: Rp to ISO 7-1,
NPT to ANSI/ASME.
VMV · Edition 02.10l
12
Technical data
7.1 Dimensions
G 1/8
H1
H2
D
L1
7.1.1 VMV with Rp internal thread
Type
VMV 110
VMV 115
VMV 120
VMV 125
VMV 225
VMV 232
VMV 240
VMV 250
Connection
Rp
3/8
1/2
3/4
1
1
11/4
11/2
2
DN
10
15
20
25
25
32
40
50
L1
mm
30
30
30
30
34
34
34
34
Dimensions
D
H1
mm
mm
62.7
48
62.7
48
62.7
48
62.7
48
88
64
88
64
88
64
88
64
H2
mm
44.6
44.6
44.6
44.6
65.1
65.1
65.1
65.1
.
Vair with ∆p = 1 mbar
kV max
kV min
Weight*
m3/h
7.2
9.9
15.4
15.4
28.8
41.0
41.0
41.0
m3/h
8.3
11.4
17.7
17.7
33.0
47.0
47.0
47.0
m3/h
0.15
0.15
0.15
0.15
0.56
0.56
0.56
0.56
kg
0.212
0.212
0.212
0.212
0.460
0.460
0.460
0.460
* Without flanges and connection parts.
VMV · Edition 02.10l
13
Technical data
G 1/8
H1
H2
D
L1
7.1.2 VMV with NPT internal thread
Connection
Type
VMV 110
VMV 115
VMV 120
VMV 125
VMV 225
VMV 232
VMV 240
VMV 250
NPT
3/8
1/2
3/4
1
1
11/4
11/2
2
DN
10
15
20
25
25
32
40
50
L1
inch
1.18
1.18
1.18
1.18
1.34
1.34
1.34
1.34
Dimensions
D
H1
inch
inch
2.46
1.89
2.46
1.89
2.46
1.89
2.46
1.89
3.46
2.52
3.46
2.52
3.46
2.52
3.46
2.52
H2
inch
1.76
1.76
1.76
1.76
2.56
2.56
2.56
2.56
.
Vair with ∆p =0.04 "WC
Weight*
SCFH
243
334
520
520
972
1384
1384
1384
lbs
0.47
0.47
0.47
0.47
460
1.01
1.01
1.01
* Without flanges and connection parts.
VMV · Edition 02.10l
14
Maintenance
8 Maintenance
Check for external tightness at least once per annum,
at least twice per annum for operation with biologically
produced methane.
VMV · Edition 02.10l
15
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Remarks
Kromschröder AG
Michael Rehkamp
m.rehkamp@kromschroeder.com
Osnabrück
Contact
VMV · Edition 02.10l
The current addresses of our international agents
are available on the Internet:
www.kromschroeder.de/Weltweit.20.0.html?&L=1
We reserve the right to make technical
modifications in the interests of progress.
Copyright © 2016 Elster GmbH
All rights reserved.
03250910
Elster GmbH
Postfach 2809 · 49018 Osnabrück
Strotheweg 1 · 49504 Lotte (Büren)
Germany
Tel +49 541 1214-0
Fax +49 541 1214-370
info@kromschroeder.com
www.kromschroeder.com