Elektrogas Brand VMRNA Model Reverse Acting Hydraulic Solenoid Valve / Gas Appliances Automatic Vent Valve

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.

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.