Elektrogas VMR Series User manual

elektrogas.com
VMR
VMR-OTN
Safety solenoid valves for gas
Fast opening and fast closing type
DN8 … DN150
EE161 -0108

ELEKTROGAS – TECHNICAL MANUAL
2-13
VMR
VMR-OTN
Safety solenoid valves for gas
Fast opening and fast closing type
Contents
Description ………………………………………….. 2
Features …………………………………………….. 2
Functioning and application ………………………. 3
Accessories and optionals ………………………… 4
Technical specifications …………………………… 4
Gas flow chart (pressure drop) …………………… 6
Ordering information ………………………………. 8
Standards and approvals …………………………. 9
Installation, adjustment and servicing ……………..10
Description The VMR type valve is a fast opening single-stage solenoid valve, normally closed (open when
energized). This type of device is suitable for air or gas blocking and releasing controls, required
in gas power burners, atmospheric gas boilers, industrial kilns and others gas consuming
appliances.
Features The valves are made of aluminum alloy die-cast (or hot-pressed brass for OTN versions), with a
wide range for inlet/outlet connections from DN 8 up to DN 150.
Suitable for use with air and non-aggressive gases included in the 1, 2 and 3 families (EN 437).
This valve is open only when energized: if, for any reason, power supply goes down, the valve
closes immediately (intrinsic safe).
Qualified for continuous service (100% ED).
An incorporated fine mesh filter protects the valve seat and disc as well as downstream
components and prevents dirty contamination (except brass models).
Provided with G1/4 pressure gauge on two sides in the inlet chamber (except brass models).
Flanged models are provided with gauges in the outlet chamber too. Other gauge points on
request.
Provided with G1/8 connection on the bottom for closed position indicator micro switch from
DN65 to DN150 (on request from 3/4" to 2").
The coils are provided with ISO 4400 plug or with terminal box. Both systems are provided with
suitable cable gland to avoid water and dirty contamination.
Pipe connections meet group 2 and backpressure sealing is compliant with class A, according
to EN161 requirements.
All components are designed to withstand any mechanical, chemical and thermal condition
occurring during typical service. Effective impregnation and surface treatments have been used
to improve mechanical sturdiness, sealing and resistance to corrosion of the components.
Valves are 100% tested by computerized testing machineries and are fully warranted.
WARNING
This control must be installed in compliance with the rules in force.

ELEKTROGAS – TECHNICAL MANUAL
3-13
Functioning and
application The VMR type valve is a safety shutting device using auxiliary power supply.
When it is de-energized, the spring pushes on the seal disc, keeping the gas passage closed.
Now, the inlet chamber is under the gas line pressure, and it forces on the disc too, improving
the seal.
When the coil is powered the valve opens rapidly, against the strength of the spring and gas
pressure. The flow may be adjusted using the regulating screw on the top (see the Installation,
adjustment and servicing section).
If the power supply is shut off, the valve rapidly closes, interrupting the gas flow.
Fig.1
This kind of valve is normally installed as safety and regulating device in gas trains, for industrial
applications and gas firing systems.
Figure 2 shows an example of installation.
Fig.2
WARNING
Location and mode of installation must be in compliance with local rules in force.
Fast opening
solenoid valve
Gas
network
Consumer
Slow opening
solenoid valve
Ball
valve
Valve
leak
teste
r
Gas
filter
Pressure
regulator
Pressure
switch
Pressure
gauge

ELEKTROGAS – TECHNICAL MANUAL
4-13
Accessories and
optionals A fine mesh filter is provided, to prevent dirty contamination of the seal seat. However, an
external strainer must be installed upstream of the valve. Brass models are available without
internal filter only.
Inlet pressure chamber is provided with bilateral G1/4 gauges, to connect manometers,
pressure switches, leakage tester or other gas equipments. Flanged models are provided with
gauges in the outlet chamber too. Brass models are available without gauges only.
Models from DN65 to DN150 are provided with G1/8 connection on the bottom for closed
position indicator micro-switch (on request from 3/4" to 2"). To install the micro-switch the
installing kit must be required.
The threaded models Rp11/2 and Rp2 can be provided with flanged connections using an
optional kit.
Technical
specifications Tab. 1
Connections Gas threaded ISO 7/1 from Rp1/4 to Rp2
Flanged PN16 – ISO 7005 from DN40 to DN150
Voltage rating 230 VAC 50/60 Hz
110 VAC 50/60 Hz
24 VAC/DC
12 VAC/DC
Voltage tolerance -15% / +10%
Power consumption see charts
Ambient temperature -15°C / +60°C
Max. operating pressure 200 mbar (20 kPa)
360 mbar (36 kPa)
Flow capacity see charts
Closing time < 1 second
Opening time < 1 second
Filter (except brass models) 600 µm, metal mesh
Protection class IP54 (EN 60529)
Cable gland ISO 16 (EN 50262) for terminal box
PG 9 for standard plug
Coil winding insulation Class H (200°C)
Coil thermal resistance Class F (155°C)
Materials in contact with gas Aluminium alloy
Brass
Stainless steel
Plated steel
Anaerobic adhesive
Nitrile rubber (NBR)
Polytetrafluoroethylene (PTFE)

ELEKTROGAS – TECHNICAL MANUAL
5-13
Fig.3
Tab. 2
Material and
connections
Overall dimensions
[mm]
CuZn AlSi
Power
consumption
@230VAC
[W]
Flow factor
Kvs
[m³/h] A B C D Int h
Weight
[Kg]
Rp 1/4 8 0,55 30 46 66,5 75 - - 0,27
Rp 3/8 16 0,7 30 58 95 110 - - 0,4
Rp 1/2 16 1,0 30 58 95 110 - - 0,4
Rp 3/8 20/25 (2) 2,9 88 77 124 140 - - 1,4
Rp 1/2 20/25 (2) 4,0 88 77 124 140 - - 1,4
Rp 3/4 45 9,5 88 96 150 164 - - 2,5
Rp 1 45 12,0 88 96 150 164 - - 2,5
Rp 11/4 20/80 (3) 20,0 120 153 188 220 - - 5,7
Rp 11/2 20/80 (3) 26,0 120 153 188 220 - - 5,7
Rp 2 20/80 (3) 40,0 106 156 192 230 - - 6
DN 40 (1) 20/80 (3) 26,0 150 193 188 262 110 4x18 7,4
DN 50 (1) 20/80 (3) 40,0 165 196 192 274 125 4x18 8
DN 65 60/240 (3) 63,0 200 305 266 355 145 4x18 14
DN 80 60/240 (3) 80,0 200 305 266 355 160 8x18 14
DN 100 80/320 (3) 148,0 252 350 352 492 180 8x18 36
DN 125 90/360 (3) 250,0 310 460 430 600 210 8x18 58
DN 150 90/360 (3) 315,0 310 460 430 600 240 8x23 60
(1) Optional Kit (2) 360/200mbar (3) Working/Opening

ELEKTROGAS – TECHNICAL MANUAL
6-13
AIRGAS VkV ⋅=
1
0.1 0.5 0.3 0.4 0.2 0.6 0.7 0.8
1 5 2 3 4
10
6 7 8
0.2
50 30 40 20
100
60 70 80
200
0.2
0.3
0.2
0.3
0.3
0.4
0.4
0.5
0.6
0.5
0.4
0.7
0.8
0.8
0.7
0.6
0.5
0.7
0.6
0.8
1
1
DN 125
DN 80
DN 65
DN 100
DN 150
1
100
80
108
3
2
2
2
34
3
5
4
7
6
6
5
4
6
7
5
8
78
10
30
10
20
20
20
30
40
30
60
50
60
50
40
40
50
70
60 70
80
800
200
100
80
70
100
200
300
400
500
600
300
200
400
500
300
400
500
600
700
700
800
1000
600
800
700
1000
1000
2000
5000
4000
3000
2000
2000
4000
3000
3000
5000
4000
5 2 3 4
10
8 7 6
50 20 40 30 80 70 60
100 200 300 800 700
1000 2000
5000
Rp 1/2-OTN
Rp 3/8-OTN
Rp 1½
Rp 1/2
Rp 3/8
Rp 1
Rp 3/4
Rp 1¼
Rp 2
Air
dP [mmH O]
2
dP [mbar]
V [Nm³/h]
0.1
0.3
0.2
0.6
0.5
0.4
0.7
0.8
1
2
4
3
8
7
5
6
10
3000
60
30
20
50
40
100
70
80
200
800
400
300
700
500
600
1000
2000
Natural gas Town gas LPG
Rp 1/4-OTN
Gas flow chart
(Pressure drop)
Fig. 4
Formula of conversion
from air to other gases Tab. 3
15°C, 1013 mbar, dry
Gas type Specific gravity
ρ
[Kg/m³] GAS
.
k
ρ
251
=
Air 1,25 1,00
Natural gas 0,80 1,25
Town gas 0,57 1,48
LPG 2,08 0,77

ELEKTROGAS – TECHNICAL MANUAL
7-13
When the flow read on the diagram is referred to operating pressure instead of standard
conditions, the pressure drop ∆p read on the diagram must be multiplied for the factor:
(1+ relative pressure in bar)
Example:
In the 2” solenoid valve with an air flow of 80 Nm3/h there is a pressure drop ∆p = 5 mbar.
If we consider that 80 m3/h is the flow at 200 mbar of inlet pressure, then the pressure drop to
be consider is:
∆p = 5x(1+0,2) = 6 mbar
Normally, pressure drop and flow rate for the valves are read from the gas flow diagram.
However, the valves can also be chosen in accordance with the characteristic ”Kvs value” which
is shown in table 2.
The selection of the valve requires the calculation of the Kv under the operating conditions.
Considering only subcritical pressure drops:
2
1
p
p<∆
Kv can be calculated with the formula:
()
2
273
514 pp
tV
Kv ⋅∆
+
=
ρ
where
V = flow rate [Nm3/h]
Kv = flow factor [m3/h]
ρ= density [Kg/m3]
p1= absolute inlet pressure [bar]
p2= absolute outlet pressure [bar]
∆p = differential pressure p1-p2[bar]
t = media temperature [°C]
To the Kv value calculated from operating conditions we add an allowance of 20%, to obtain the
minimum Kvs value which the valve should have:
Kvs > 1,2 Kv
Valve must be selected considering the following:
- Pressure drops ∆p ≤0,1p1are recommended and ∆p > p1/2 are always unadvisable
- Flow velocities w ≤15 m/s are recommended and w > 50 m/s are always unadvisable.

ELEKTROGAS – TECHNICAL MANUAL
8-13
Ordering
information
Tab.4
Material and Connections 230V 110V 24V 12V
CuZn AlSi 200 mbar 360 mbar 200 mbar 360 mbar 200 mbar 200 mbar
Rp 1/4 VMR01OTN 1VMR01OTN.B1VMR01OTN.C1VMR01OTN.D1
Rp 3/8 VMR02OTN 1VMR02OTN.B1VMR02OTN.C1VMR02OTN.D1
Rp 1/2 VMR12OTN 1VMR12OTN.B1VMR12OTN.C1VMR12OTN.D1
Rp 3/8 VMR02A
1VMR0 VMR02A.B 1VMR0.B VMR02.C VMR02.D
Rp 1/2 VMR12A
1VMR1 VMR12A.B 1VMR1.B VMR12.C VMR12.D
Rp 3/4 VMR2 VMR2.B VMR22.C VMR22.D
Rp 1 VMR3 VMR3.B VMR32.C VMR32.D
Rp 1¼ VMR35 VMR35.B VMR352.C VMR352.D
Rp 1½ VMR4 VMR4.B VMR42.C VMR42.D
Threaded
Rp 2 VMR6 VMR6.B VMR62.C VMR62.D
DN 40
2VMR4F VMR4F.B VMR42F.C VMR42F.D
DN 50
2VMR6F VMR6F.B VMR62F.C VMR62F.D
DN 65 VMR72 VMR7 VMR72.B VMR7.B VMR72.C
DN 80 VMR82 VMR8 VMR82.B VMR8.B VMR82.C
DN 100 VMR92 VMR9 VMR92.B VMR9.B VMR92.C
3
DN 125 VMR932 VMR93 VMR932.B VMR93.B
Flanged
DN 150 VMR952 VMR95 VMR952.B VMR95.B
(1) Provided with DIN plug (2) Optional kit (3) Class B
The versions with inlet pressure p1≤200 mbar (20 kPa) may be order inserting the digit “2” in to
the designation.
Different voltage than 230V may be order adding to the standard designation the additional
code as shown above.
Example:
VMR72.B for a valve with DN65 flanged connections, 110VAC, 200 mbar
Manufacturer reserves the right to update or make technical changes without prior notice.

ELEKTROGAS – TECHNICAL MANUAL
9-13
Standards and
approvals The valve design meets current European approval requirements regarding safety shut-off
functions on gaseous fuels.
These products conform with the Gas Appliances Directive (90/396/EEC) and the certification
has been issued by the notified body:
GASTEC CERTIFICATION B.V.
Wilmersdorf, 50
NL-7323 AC Apeldoorn
CE Reg.-Nr. 0063AQ1350
The following standards/technical specifications have been fulfilled:
- Electromagnetic Compatibility (2004/108/EC)
- Low Voltage Directive (2006/95/EC)
Quality Management System is certified according to UNI EN ISO 9001 and the monitoring is
carried out by the notified body:
Kiwa Gastec Italia Spa
Via Treviso, 32/34
I- 31020 San Vendemiano (TV)

ELEKTROGAS – TECHNICAL MANUAL
10-13
Installation,
adjustment
and servicing To assure a proper and safe operation, as well as a long life of the valve, the installation
procedure and a periodical servicing are very important topics and the following instructions
should be always fulfilled.
IMPORTANT: before proceeding with the installation, ensure that all the features of your system
are comply with the specifications of the valve (gas type, operating pressure, flow rate, ambient
temperature, electrical voltage, etc.).
CAUTION
Shut off the gas supply at the main manual shut-off valve and disconnect electrical
power to the valve before proceeding installation or servicing.
PIPING CONNECTION
- Check correspondence of flow direction with arrow printed on valve body.
- Check correct alignment of connecting pipes.
- Ensure that installing area is protected from rain and water splashes or drops.
- Remove the end caps and make sure no foreign body is entered into the valve during
handling.
THREADED MODELS
- Put sealing agent onto the pipe thread. Avoid excessive quantities which could enter in the
valve and damage the seal seat.
- Screw the pipes using proper tools only. Do not use unit as lever because damage to the
valve stem could result.
FLANGED MODELS
- Position the gasket or sealing agent on the flanges and insert the bolts with washers.
- Screw the nuts tightening them crosswise and using proper tools only. Avoid overtightening
and mount tension free.
Following chart shows the maximum values of bending moment (Fmax), torque (Tmax) and
screws driving torque (Cmax), according to EN161.
Tab. 5
Fig. 5
Valve may be mounted with coil in horizontal or vertical position. Coil may be oriented 360
degrees in any direction.
Connections Fmax
(Nm) t<10 s
Tmax
(Nm)
Cmax
(Nm)
Rp1/4 35 20 -
Rp3/8 70 35 -
Rp1/2 105 50 -
Rp3/4 225 85 -
Rp1 340 125 -
Rp1¼ 475 160 -
Rp1½ DN40 610 200 50
Rp2 DN50 1100 250 50
DN65 1600 - 50
DN80 2400 - 50
DN100 5000 - 80
DN125 6000 - 160
DN150 7600 - 160
Maximum 90°
from vertical

ELEKTROGAS – TECHNICAL MANUAL
11-13
ELECTRICAL CONNECTION (IEC 730-1)
Valve is provided with terminal box or standard plug (see tab. 4) for the electrical connections.
To connect the valve do the following:
Terminal box version:
- Using a screwdriver remove the box cover.
- Unscrew the gland-nut (7) and remove the retaining ring
(9) and conical grommet (5).
- Insert the cable in to the gland-nut, retaining ring, grommet
and then into its housing in the box cover.
- Connect power cables to the rectifier terminals (1)
according to printed designation.
- Pull the cable and screw back the box cover, make sure
the gasket (2) is properly used.
- Screw back the gland-nut, make sure that the grommet is
locked on the cable.
Should cables pass through originally closed opening, use
the rubber capsule placed underneath the cap to close any
other opening.
Fig. 6 Standard plug version:
- Using a screwdriver remove the plug from the coil.
- Unscrew the gland-nut (7) and remove the washer (6) and
grommet (5).
- To remove the rectifier unit (1) from the plug housing (3),
remove the gasket (2) and extract the screw (4) completely,
then insert a flat screwdriver into the slot located on edge
and pull it.
- Insert the cable in to the gland-nut, washer, grommet and
then into the plug housing.
- Connect power cables to the rectifier terminals according
to printed designation.
- Pull back the cable and insert the rectifier unit into the
housing.
- Screw back the gland-nut, make sure that the grommet is
locked on the cable.
- Insert the screw and gasket into the housing and screw
back the plug on the coil.
Fig. 7
The continuous service (100% ED) causes inevitable coil heating, depending of working
environment. This situation is absolutely normal and has not to worry. To improve the
coil cooling, install the valve allowing free air circulation.
WARNING
Make sure all gaskets are used properly.
Perform leak and functional tests after mounting (max. testing pressure 1500 mbar).
All works must be executed by qualified technicians only and in compliance with local
and national codes.

ELEKTROGAS – TECHNICAL MANUAL
12-13
FLOW RATE ADJUSTMENT (Vmax)
Flow rate may be adjusted from 0 cubic meters/h to the maximum (excepting 4", 5", 6" and
brass models).
To perform regulation do the following:
1. Remove coil fastener cap.
2. Using a 4 mm Allen wrench, remove the locking dowel.
3. Located under the locking dowel is the flow regulation screw. Use the Allen wrench to set it.
4. Turn wrench clockwise to decrease or counter-clockwise to increase flow rate (factory
setting is max. flow rate).
5. When adjustment is completed, screw back the locking dowel and cap.
WARNING
Make sure that capacity adjustments are made while burner is operating.
Check the regulation is not changed during reassembly.
Adjustments below 40% of capacity are unadvisable because they may cause
turbulence.
Fig. 8
COIL REPLACEMENT
Before to start with coil replacement, make sure it is the cause of failure.
To perform coil replacement do the following:
1. Make sure an identical one spare part is available.
2. Switch off power supply and remove the box cover.
3. Disconnect the wires from terminal board.
4. Remove coil fastener cap and replace the coil.
5. Reassemble following the inverse sequence.
To maintain a good performance of the system, almost once a year, an external inspection
of the valve is recommended.
Fig. 9

ELEKTROGAS – TECHNICAL MANUAL
13-13
EXTERNAL INSPECTION
- Turn off all power before servicing any part of the system.
- Check the conditions of the plug/box gasket. If gasket is deteriorated, replace it with a
new one.
- Check the electrical connections are clean, dry and correctly tightened.
- Check the conditions of pipe connections: cover them with a soap solution and check
for leakages.
- Check the proper operation of the valve: power the coil and verify that valve opens,
then, turn off power and check the closing function.
INTERNAL INSPECTION
Make this inspection when the valve does not work properly only.
To make an internal inspection of the valve, do the following:
- Shut ball valve upstream the system and make sure no pressure is inside the valve.
- Unscrew coil fastener cap (15) and remove the coil (13).
- Using an Allen key, remove the screws (10) on the upper flange (9), in cross way. The
gas in the valve will come out during this step.
- Check the main O-ring (8). If it’s necessary, replace it with an identical one.
- Clean the internal side of the stem (11) with a clean cloth and compressed air.
- Remove the spring (7) and blow it with compressed air. Check the spring is corrosion
free. Take attention to the assembly direction of the spring.
- Check the wear conditions of the sliding rings (6) and, if it’s necessary, replace them.
- Clean the plunger assembly (4, 5, 6) with a clean cloth and compressed air.
- Check the conditions of the sealing gasket (4). If gasket is deteriorated, replace it with a
new one.
- Clean the sealing lip with a clean cloth. Do not use tools, because a lip damage could
result.
- Remove the filter (3) and blow it with compressed air.
- Reassemble the valve following the inverse sequence.
When reassembling, take attention to the correct position of the spring.
When the reassembly is finished, verify the correct sealing between the upper flange and
the valve body:
- Open ball valve to restore pressure into the valve.
- Apply a soap solution between the upper flange and the valve body and check for
leakages.
- Remove the soap solution with a clean cloth, before to reassemble the coil.
WARNING
To prevent product damage and dangerous situations, read the Installation and
Service Instructions carefully.
Turn off all power before servicing any part of the system.
Perform leak and functional tests after mounting.
Use all gaskets properly (void warranty).
All wiring must be in compliance with local and national codes.
Make sure all works are performed by qualified technicians only.
Fig. 10