Description
Description Of Delta-Elektrogas VMM Multiple Safety Solenoid Valve
Delta-Elektrogas VMM Multiple Safety Solenoid Valve is a combination of two valves in the 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 to connect a third by-pass / pilot valve, which performs by the 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 equipment that uses regulating trains.
Features
The valves are made of aluminum alloy die-cast, with a range for inlet/outlet connections from
DN20 (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, according
to EN161 requirements.
The third valve with a capacity of DN15 or DN25 can be fitted to by-pass the second one and have a
low fire stage or a second outlet for the pilot burner (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 to
2014/34/EU Directive (ATEX).
The valve is open only when energized: if, for any reason, the power supply goes down, the valve
closes immediately (intrinsic safe).
Suitable for heavy-duty cycle operation and qualified for continuous service (100% ED).
Equipped with a flow rate adjustment.
An incorporated fine mesh filter protects the valve seat and disc as well as downstream
components and prevents dirty contamination.
Provided with bilateral pressure ports on two sides in all pressure chambers, to connect
manometers, pressure switches, leakage testers,s or other gas equipment.
The coils are provided with a terminal box or with an ISO 4400 plug. Both systems are provided with
suitable cable gland to avoid water and dirt contamination.
The normally open vent valve VMRNA can be integrated into VMM from 1”¼ to 3”; dimensions
and piping are the same as the third pilot valve. See the VMRNA datasheet for other details.
All components are designed to withstand any mechanical, chemical, and thermal conditions
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.
Applications
The VMM-type valve is a safety shutting device using an auxiliary power supply.
The first valve (A) is a fast-opening safety solenoid valve. 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.
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 adjust
the 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 a low fire stage, or to obtain a
second fast (slow) stroke or both.
Specifications
Connections Gas threaded ISO 7-1 from Rp3/4 to Rp2 or
ANSI-ASME B1.20 from 3/4” NPT to 2” NPT
Flanged PN16 – ISO 7005 from DN40 to DN80 or
ANSI-ASA-ASME B16.5 class 150 from 2” to 3”
By-pass size DN15 or DN25
Voltage rating 230 VAC 50/60 Hz
120 VAC 50/60 Hz
110 VAC 50/60 Hz
24 VAC/DC
Voltage tolerance -15% / +10%
Power consumption 70W for 3/4” – 1”
90W (working) for 1”¼ -3”
by-pass 1/2″ 25W
by-pass 1″ 35W
Ambient temperature -15°C / +60°C
Media temperature
Max. operating pressure 200 mbar (3 psig)
500 mbar (5 psig)
Body test pressure 1 bar (15 psig)
Flow capacity see charts
Closing time < 1 second
Opening time Adjustable
Pressure ports G1/4 (add. G1/8 onto flanged models)
Gas strainer 600 µm (0.02 in), metal mesh
Enclosure IP54 (NEMA 3)
optional IP65 with cable (NEMA 4)
Cable gland M20x1,5 for terminal box
PG 9 for ISO plug
Wires cross-section 2,5 mm2 max. (AWG 12) for
terminal board
1,5 mm2 max. (AWG 14) for ISO
plug
Electrical safety Class I (EN 60335-1)
Coil winding insulation Class H (200°C, 392°F)
Coil thermal resistance Class F (155°C, 311°F)
(+5°F to +140°F)
