Delta Elektrogas VMM Multiple safety solenoid valve for gas regulating trains

Description

The Delta Elektrogas VMM type valve is a combination of two solenoid valves in the only compact and versatile valve housing. This type of device is suitable for air or gas blocking and releasing controls (with one or two stages of operation), required in gas power burners, atmospheric gas boilers, industrial kilns, and others gas-consuming appliances.

Features

The Delta Elektrogas VMM 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. A third valve with the capacity of DN15 or DN25 can be fitted to bypass 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 Delta Elektrogas VMM 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 Delta Elektrogas VMM 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, 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 glands 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.

Functioning and application

The Delta Elektrogas VMM type valve is a safety shutting device using the 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.

Baca juga: Elektrogas automatic safety solenoid valves

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.

This kind of valve is normally installed as a safety and regulating device in gas trains, for industrial applications, and gas firing systems.

Specification of Delta Elektrogas VMM

Design, installation, and servicing

To assure a proper and safe operation, as well as the long service life of the valve, consider the following recommendations during the design of the system where the Delta Elektrogas VMM valve will be installed:

• Ensure that all the features of your system comply with the specifications of the valve (gas type, operating pressure, flow rate, ambient temperature, electrical voltage, etc.).
• The valve may be mounted with the coil in the horizontal or vertical position, not upside down. The coil may be oriented 360 degrees in any direction.
• In the event of a vertical pipe, the flow direction should be from bottom to top.
• After removing the end caps make sure no foreign body will enter the valve during handling or installation (e.g. swarf or excessive sealing agent).
• A gas filter should be always installed upstream of the valve.
• Ensure that installing area is protected from rain and water splashes or drops.
• Perform leak and functional tests after mounting.
• Continuous service (100% ED) causes inevitable coil heating, depending on the working environment. Never install the valve close to walls or other equipment. To improve the coil cooling, install the valve allowing free air circulation.
• Perform maintenance according to service instructions at least once a year (most often for aggressive gases).
• Due to seal aging, to ensure safe operation, we recommend the valve replacement after 10 years from the date of manufacture stamped on the product. The heavy cycle operation may reduce the expected lifetime.
• This control must be installed in compliance with the rules in force.
• Make sure all works are performed by qualified technicians only and are in compliance with local and national codes.
• To prevent product damage and dangerous situations, read carefully the instructions supplied with the product before use.

Data Sheet Delta Elektrogas-VMM

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