The VMRNA type is an automatic vent valve for gas appliances. It is suitable for discharging
excess or leakage gas into relief lines.
VMRNA valve is a reverse acting solenoid valve: when de-energized, the valve is open (N.O.
The valves are made of aluminum alloy with connections from 3/4” or 1”½. 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.
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
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
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
Connections : Internal threaded ISO 7-1 Rp3/4 – Rp1½
or ANSI-ASME B1.20 3/4”NPT – 1½”NPT (special ver.)
Voltage : 230 VAC 50/60 Hz
110 VAC 50/60 Hz
Max. operating pressure :
500mbar (7psig) or 6bar (90psig) – only ¾”-1”
200mbar (3psig) or 2bar (30psig) – only ¾”-1”
Voltage tolerance : -15% to +10%
Power consumption : 35W
Ambient temperature : -15°C / +60°C (+5°F to +140°F)
Opening and closing time < 1 second
Protection class : IP54 (EN 60529) – optional IP65
Cable gland and wire section :
Terminal box: M20x1,5 – 2,5 mm2 max.
or ISO plug (optional): PG9 – 1,5 mm2 max.
Materials in contact with gas :
Aluminum alloy, Brass, Stainless steel, Plated steel,
Anaerobic adhesive, Nitrile rubber (NBR), Fluoro
elastomer (FPM), Polytetrafluoroethylene (PTFE)