VMRNA Type Reverse Acting Solenoid Valve
Automatic Vent Valve For Gas Appliances
Description
The Elektrogas VMRNA type is an automatic vent valve for gas
appliances. It is suitable for discharging
excess or leakage gas into relief lines.
Features
VMRNA valve is from Elektrogas company,this model is a reverse
acting solenoid valve: when de-energized, the valve is open
(normally open).
The valves are made of aluminum alloy with connections from 3/4” or
1”.. Pipe connections meet group 2.Sealings are made of NBR-based
rubber certified for use with air gas (EN 549). Suitable for use
with air and non-aggressive gases included in the 1st, 2nd and 3rd
families (EN 437). Special versions for aggressive gases (e.g.
biogas).
Qualified for continuous service (100% ED).
Provided with G1/4 pressure gauge on two sides in inlet chamber to
connect manometers,pressure switches, or other gas equipment.
Provided with G1/8 connection to fit an open position indicator
switch (see PCS datasheet – This device shall be ordered
separately).
VMRNA valve can be integrated in Elektrogas VMM valve, resulting in
a very compact system(see VMM datasheet for details).
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 and fully warranted.
Functioning and application
The VMRNA type valve is a vent valve for relief line. When it is
de-energized,the spring pushes on the magnetic core and the disc is
open, hence gas can flow to relief line. This device is usually
integrated in burning system: when the system is de-energized,
upstream safety shut off valves are closed, while vent valve is
open, so that fuel gas inside pipe can be discharged in a safe
area.
In case of leakages of shut off valves,gas goes to relief line in a
safe condition.
When the system is powered, vent valve closes while the main shut
off valves
open, hence fuel can flow to burner.
Fig. 1 shows a scheme of VMRNA valve.
This kind of valve is usually installed as safety device in gas
trains, for industrial applications and gas firing systems. Fig. 2
shows an example of installation, in combination with other
Elektrogas devices.
| Connections | Internal threaded ISO 7-1 from Rp1/4 to Rp2½ or
ANSI-ASME B1.20 from 1/4"NPT to 2"½ NPT
Flanged ISO 7005 PN16 from DN40 to DN150 or
ANSI-ASA-ASME B16.5 class 150 from 2” to 6” |
| Voltage Ratings | 230 VAC 50/60 Hz
120 VAC 50/60 Hz
110 VAC 50/60 Hz
24 VAC/DC
12 VAC/DC |
| Max. Operating Pressure | 200 mbar (3 psig)
360 mbar (5 psig)
500 mbar (7 psig)
6 bar * (90 psig) |
| Body Test Pressure | 1 bar (15 psig)
9 bar * (130 psig) |
| Closing Time | < 1 second |
| Opening Time | < 1 second |
| Gas strainer | 600 μm (0.02 in)
(except brass models and 6 bar) |
| Enclosure | IP54 (NEMA 3)
optional IP65 with cable (NEMA 4) |
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
Elektrogas Solenoid 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 (1/4”) up to DN 150 (6”).
Sealings are made of NBR-based rubber certified for use with gas
(EN 549).
Suitable for use with air and non-aggressive gases included in the
1, 2 and 3 families (EN 437).
Special versions suitable for aggressive gases, free of non-ferrous
metals and with FPM seals.
Pipe connections meet Group 2 and backpressure sealing is compliant
with Class A, according to EN161 requirements.
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, 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 flow rate adjustment (except brass models).
An incorporated fine mesh filter protects the valve seat and disc
as well as downstream components and prevents dirty contamination
(except brass models and 6 bar).
Provided with G1/8 connection to fit a proof of closure switch or a
visual indicator.
Provided with 1/4" pressure gauge on two sides in the inlet chamber
(except brass models), to
connect manometers, pressure switches, leakage detectors 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.
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.
Elektrogas Solenoid Valves are 100% tested by computerized testing
machineries and are fully warranted.
