VMM Model Elektrogas Multiple Safety Solenoid Valve For Gas
Regulating Trains
Elektrogas VMM type valve is a combination of two valves in an only
compact and versatile valve housing. The first valve is a fast
opening safety solenoid valve. The second valve may be a fast
opening or a slow opening solenoid valve to adjust the gas flow,
with a first adjustable fast stroke and a second adjustable slow
stroke. It is possible connect a third by-pass / pilot valve, which
performs by driver stage or to obtain a second fast (slow) stroke
or both. This type of device is suitable for gas and air blocking
and adjusting controls in atmospheric burners or fan-assisted
burners (with one or two stage operation), in industrial kilns and
in all gas equipments which use regulating trains.
Specification
The VMM type valve is a combination of two solenoid valves in an
only compact and versatilevalve housing.
This type of device is suitable for air or gas blocking and
releasing controls (with one or twostages operation), required in
gas power burners, atmospheric gas boiler, industrial kilns
andothers gas consuming appliances.
Technical Specifications
| Connections | ANSI-ASME B1.20 from 3/4"NPT to 2" NPT
Flanged PN16,DN40 to DN80 or
ANSI-ASA-ASME B16.5 class 150 from 2” to 3” |
| Voltage Ratings | 230 VAC 50/60 Hz
120 VAC 50/60 Hz
110 VAC 50/60 Hz
24 VAC/DC |
| Max. Operating Pressure | 200 mbar (3 psig)
500 mbar (7 psig) |
| Body Test Pressure | 1 bar (15 psig) |
| Closing Time | < 1 second |
| Opening Time | Adjustable |
| Gas strainer | 600 μm (0.02 in),metal mesh |
| Enclosure | IP54 (NEMA 3)
optional IP65 with cable (NEMA 4) |
Description
The valves are made of aluminum alloy die-cast, with a range for
inlet/outlet connections fromDN20 (3/4") up to DN80 (3").
Sealings are made of NBR-based rubber certified for use with gas
(EN 549).
Pipe connections meet group 2 and backpressure sealing is compliant
with class A, accordingto EN161 requirements.
A third valve with capacity of DN15 or DN25 can be fitted to
by-pass the second one and have alow fire stage or a second outlet
for pilot bumer (pilot execution).
Suitable for use with air and non-aggressive gases included in the
1, 2 and 3 families (EN 437).Special versions for aggressive gases
.
The whole range can be provided in Ex-proof execution, for use in
Zones 2 and 22, according to2014/34/EU Directive (ATEX).
The valve is open only when energized: if, for any reason, power
supply goes down, the valvecloses immediately (intrinsic safe).
Suitable for heavy-duty cycle operation and qualified for
continuous service (100% ED).
Equipped with flow rate adjustment.
An incorporated fine mesh filter protects the valve seat and disc
as well as downstreamcomponents and prevents dirty contamination.
Provided with bilateral pressure ports on two sides in all pressure
chambers, to connectmanometers, pressure switches, leakage tester
or other gas equipments.
The coils are provided with terminal box or with ISO 4400 plug.
Both systems are provided withsuitable cable gland to avoid water
and dirty contamination.
The normally open vent valve VMRNA can be integrated in VMM from
1"V4 to 3"; dimensionsand piping are the same of third pilot valve.
See VMRNA datasheet for other details.
All components are designed to withstand any mechanical, chemical
and thermal conditionoccurring during typical service. Effective
impregnation and surface treatments have been usedto improve
mechanical sturdiness, sealing and resistance to corrosion of the
components.
Valves are 100% tested by computerized testing machineries and are
fully warranted.
Function and Application
The VMM type valve is a safety shutting device using auxiliary
power supply.
The first valve (A) is a fast opening safety solenoid valve. When
it is de-energized, the springpushes on the seal disc, keeping the
gas passage closed. Now, the inlet chamber is under thegas 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 gaspressure.
If the power supply is shut off, the valve rapidly closes,
interrupting the gas flow.
Equally, the second valve (B) may be a fast opening or a slow
opening solenoid valve to adjustthe gas flow, with a first
adjustable fast stroke and a second adjustable slow stroke.
It is possible to connect a third by-pass valve (C), which works as
low fire stage or to obtain asecond fast (slow) stroke or both.
