Elster Kromschroder VMF Series Handbuch

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

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

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

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

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

LEH

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

1.1.4 Industrial burner with continuous control

IC 20 + BVA

VAG

BVA

VAS

ZIO, BIO, BIOA

LEH

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

VMF · Edition 02.11

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.

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

0,1

0,2

0,3

0,4

0,5

0,6

0,8

21 3 4 6 8 10 20 30 40

0,8 1 2 3 4 6 8 10 20 30 40

0,7 1 2 3 4 6 8 10 20 30

200 300 500

200 300

100 200 300

60 100

40 60

VMF 110

∆p [mbar]

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

0,4

0,5

0,6

0,8

∆p [inch WC]

30 40 60 100 200 10000400 2000 3000 5000600 1000

[SCFH]

Standard T-product

Flow rate (V

Inlet pressure pe

∆pmax.

Medium temperature

Flow rate (V

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

°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

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.

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

Rp internal thread

NPT internal thread

Flange to ISO 7005

05 pe max 500 mbar

With pressure test points

With screw plugs

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

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.

VMF · Edition 02.11

6 Accessories

6.1 Seal set VA 1 – 3

A B

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

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.

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