Delta Elektrogas – VMRNA Automatic Vent Valve for Gas

VMRNA valve is a reverse acting solenoid valve: when de-energized, the valve is open (N.O. normally open). 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 the G1/4 pressure gauge on two sides in the 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 with the Elektrogas VMM valve, resulting in a very compact system.

Functioning and application

The VMRNA type valve is a vent valve for the relief line. When it is de-energized, the spring pushes on the magnetic core and the disc is open, hence gas can flow to the relief line. This device is usually integrated with the burning system: when the system is de-energized, upstream safety shut off valves are closed, while the vent valve is open, so that fuel gas inside the pipe can be discharged in a safe area.

In case of leakages of shut off valves, gas goes to the relief line in a safe condition. When the system is powered, the vent valve closes while the main shut off valves open, hence fuel can flow to the burner.

Specification

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
24V AC/DC
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 35 W
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 the gas Aluminum alloy, Brass, Stainless steel, Plated steel,
Anaerobic adhesive, Nitrile rubber (NBR), Fluoro
elastomer (FPM), Polytetrafluoroethylene (PTFE)

Datasheet: Delta Elektrogas VMRNA

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