Datasheet Content
VML
VML 6 bar
Safety solenoid valves for gas
Slow opening and fast closing type
DN10 … DN80
delta-elektrogas.com EE162 -04/15
ELEKTROGAS – Technical Sheet EE162 - 04/15
VML
VML 6 bar
Safety solenoid valves for gas
Slow opening and fast closing type
Contents
Description ………………………………………….......... 2
Features …………………………………………….......... 2
Functioning and application ………………………......... 3
Technical specifications ……………………………....... 4
Gas flow chart (pressure drop) ……………………....... 6
Ordering information ………………………………......... 8
Special versions and optionals ……………………....... 8
Design, installation and servicing ................................ 9
Standards and approvals …………………………........ 10
Description The VML type valve is a slow 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, with a wide range for inlet/outlet connections
from DN10 up to DN80.
Pipe connections meet group 2 and backpressure sealing is compliant with class A, according
to EN161 requirements.
Suitable for use with air and non-aggressive gases included in the 1, 2 and 3 families (EN 437).
Special versions for aggressive gases (Biogas, COG).
The whole range can be provided in Ex-proof execution, for use in Zones 2 and 22, according to
94/9/EC Directive (ATEX).
The valve is open only when energized: if, for any reason, power supply goes down, the valve
closes immediately (intrinsic safe).
Suitable for cycle operation and qualified for continuous service (100% ED).
Equipped with max. flow rate and start flow rate adjustment.
An incorporated fine mesh filter protects the valve seat and disc as well as downstream
components and prevents dirty contamination (except 6 bar models).
Provided with G1/4 pressure gauge on two sides in the inlet chamber, to connect manometers,
pressure switches, leakage tester or other gas equipments. Flanged models are provided with
gauges also in the outlet chamber.
The coils are provided with terminal box or with ISO 4400 plug (optional). Both systems are
provided with suitable cable gland to avoid water and dirty contamination.
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.
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ELEKTROGAS – Technical Sheet EE162 - 04/15
Functioning and
application The VML 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 slowly because of the hydraulic brake, against the
strength of the spring and gas pressure. The rapid stroke may be adjusted using the regulating
screw on the top (see the installation and service instructions), to adjust the initial gas flow.
Main flow and opening time can be adjusted also.
If the power supply is shut off, the valve rapidly closes, interrupting the gas flow.
Hydraulic Hydraulic
brake brake
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.
Slow opening
Pressure
solenoid valve
regulator
Pressure Fast opening
gauge solenoid valve
Valve
Gas leak
Ball Pressure
filter tester
valve switch
Gas Consumer
network
Fig.2
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ELEKTROGAS – Technical Sheet EE162 - 04/15
Technical
specifications Tab. 1
Connections Gas threaded f/f ISO 7-1 from Rp1/2 to Rp2½
Flanged PN16 – ISO 7005 from DN40 to DN80
Voltage rating 230 VAC 50/60 Hz
110 VAC 50/60 Hz
24 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)
500 mbar (50 kPa)
6 bar (600 kPa)
Flow capacity see charts
Closing time < 1 second
Opening time Adjustable
Filter (except brass models) 600 µm
Protection class IP54 (EN 60529)
(optional IP65 with cable)
Cable gland M20x1,5 (EN 50262) for terminal box
PG 9 for standard plug
Wires cross-section 2,5 mm2 max.
Electrical safety Class I (EN 60335-1)
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)
Fluoro elastomer (FPM)
Polytetrafluoroethylene (PTFE)
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ELEKTROGAS – Technical Sheet EE162 - 04/15
Fig. 3
Tab. 2
Material and Power consumption Flow factor Overall dimensions Weight
connections 230VAC Kvs
[VA/W] [mm]
AlSi 20 kPa 36 kPa 50 kPa 600 kPa [m³/h] A B C D Int h [Kg]
Rp 3/8 20 20 2,9 88 77 180 196 - - 1,8
Rp 1/2 20 20 4,8 88 77 180 196 - - 1,8
Rp 3/4 35 35 35 9,5 88 96 200 222 - - 2,7
Rp 1 35 35 35 12,0 88 96 200 222 - - 2,7
Rp 1¼ 45/1802 45/1802 45/1802 22,0 120 153 261 294 - - 6,2
Rp 1½ 45/1802 45/1802 45/1802 29,0 120 153 261 294 - - 6,2
Rp 2 45/1802 45/1802 45/1802 40,0 106 156 265 304 - - 6,5
Rp 2½ 45/1802 60/240 2
60/2402 65,0 180 218 324 370 - - 12,1
DN 40 1 45/1802 45/1802 45/1802 29,0 150 193 261 336 110 4x18 7,6
DN 50 1 45/1802 45/1802 45/1802 40,0 165 196 265 348 125 4x18 8,3
DN 65 45/1802 60/2402 60/2402 65,0 200 305 336 425 145 4x18 14,5
DN 80 45/1802 60/2402 60/2402 80,0 200 305 336 425 160 8x18 14,5
(1) Flanged connection optional Kit (2) Working/Starting
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ELEKTROGAS – Technical Sheet EE162 - 04/15
Gas flow chart
(Pressure drop)
Fig. 4
Formula of conversion
from air to other gases…
