Elektrogas VMH Series Gas Valve - Wiratama Mitra Abadi | Industrial Equipment

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22.2.19

Elektrogas VMH Series Gas Valve

VMH
Safety shut off valves for gas
with hydraulic actuator
DN65 … DN200


Description 

The VMH type valve is a safety shut off valve for gas with hydraulic actuator. It is suitable for air or gas blocking and releasing controls, required in the main pipe of gas power burners,
atmospheric gas boilers, industrial kilns and others gas consuming appliances. Depending on series, VMH valves can be used in pipeline with pressure from 3.2 to 0.2bar (see Tab. 2).


Features 

The valves are made of aluminum alloy with a range for connections from DN 65 up to DN 200.
Pipe connections meet group 2 and backpressure sealing is compliant with class A, according
to EN161 requirements.
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 valve is open only when energized: if, for any reason, power supply goes down, the valve
closes immediately (intrinsic safe).
Qualified for continuous service (100% ED).
Size DN65-80 is equipped with flow rate adjustment.
An incorporated fine mesh filter protects the valve seat and disc as well as downstream
components and prevents dirty contamination.
Provided with G1/4 pressure gauge on two sides in both inlet and outlet chamber to connect
manometers, pressure switches, leakage tester or other gas equipments.
The actuator is provided with ISO 4400 plug for easy cabling. The protection class is IP65 (EN
60529).
If compressed air is available, the hydraulic actuator can be replaced with a pneumatic one
(VMP series). For further information see VMP datasheet.
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 VMH type valve is a safety shutting device using auxiliary power supply. 
When it is de-energized, the spring pushes on the seal disc, keeping the gas passage closed. In this condition the inlet chamber is filled with pressurized gas that forces on the disc, improving the seal.
When the actuator is powered, the relief valve closes, the pumps starts and the pressurized oil pushes the piston and the disc opens against the combined force of spring and gas pressure.
When the disc reaches the end stop, the pump is turned off and only the relief valve is consuming power.
If the power supply is shut off, the relief valve opens and the disc closes rapidly, interrupting
the gas flow. Fig. 1 shows a sketch of a VMH valve.


This kind of valve is normally installed as safety and regulating device in gas trains, for industrial
applications and gas firing systems. Fig. 2 shows an example of installation, in combination with
other Elektrogas devices.


Special versions and optionals 

A switch can be installed as a closed position indicator (see PCS ). Whole range can be provided with Ex-proof execution for use in Zone 2, according to 94/9/EC
Directive (ATEX).
The whole range can be supplied in special version suitable for aggressive gases (i.e. biogas, COG). This version is free of nonferrous metals and equipped with special seals.


Technical specifications

Connections : Flanged PN16 – ISO 7005 from DN65 to DN200
Voltage rating : (-15%/+10%) 230 VAC 50/60 Hz - 110 VAC 50/60 Hz
Power consumption : see Tab. 2
Ambient temperature : -15°C / +60°C
Max. operating pressure : see Tab. 2
Flow capacity : see Tab. 2
Closing time : < 1 second
Opening time : see Tab. 2
Filter : 600 μm, metal mesh
Protection class : IP65 (EN 60529)
Cable gland Plug : ISO 4400 (EN 50262)
Materials in contact with gas : Aluminium alloy, Brass, Stainless steel, Plated steel, Anaerobic adhesive, Nitrile rubber (NBR), Fluoro elastomer (FPM), Polytetrafluoroethylene (PTFE)

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