Elektrogas VMH Automatic Safety Valve

Elektrogas VMH Automatic Safety Valve | Safety Shut Off Valves

The VMH type valve is a safety shut-off valve for gas with hydraulic actuation. Suitable for air or gas blocking and release controls, it's designed for main pipelines in gas power burners, atmospheric gas boilers, industrial kilns, and other gas-consuming appliances. When energized, the valve opens slowly (over several seconds) and closes immediately upon power interruption. Refer to Tab. 2 for maximum operative pressures per model.

Technical Specifications

Feature	Specification
Connection Range	DN 65 to DN 300
Material	Aluminum alloy (AISI: DN65-DN200)
Gas Compatibility	Air & non-aggressive gases (EN 437 Families 1-2-3) Special versions for biogas/COG & aggressive gases
Operating Pressures	0 - 200 mbars 0 - 500 mbars 0 - 1300 mbars 0 - 1600 mbars
Safety Features	Intrinsically safe (closes on power loss) Continuous service qualified (100% ED)
Certifications	EC-type tested & certified (EN 161)
Special Functions	Flow rate adjustment (DN65-80) Integrated fine mesh filter G1/4 pressure gauge ports

Features

• The valves are made of aluminum alloy with a range for connections from DN 65 up to DN 300.
• Pipe connections meet group 2 standards.
• Suitable for use with air and non-aggressive gases included in the 1st, 2nd and 3rd families (EN 437).
• Special versions available for aggressive gases.
• The valve opens only when energized: immediate closure occurs during power failure (intrinsic safety).
• Qualified for continuous service (100% ED).
• Size DN65-80 is equipped with flow rate adjustment capability.
• Incorporated fine mesh filter protects valve components and prevents contamination.
• Features G1/4 pressure gauge ports on both inlet and outlet chambers.
• Actuator includes ISO 4400 plug for easy cabling with IP65 protection (EN 60529).
• Actuator includes LED power indicator.
• All components withstand mechanical, chemical, and thermal stresses through specialized treatments.
• 100% tested with full warranty coverage.

Functioning and Application

The VMH valve operates as a safety shut-off device requiring auxiliary power. When de-energized, a spring forces the sealing disc closed. In this state, pressurized gas in the inlet chamber enhances the seal against the disc.

During activation, the relief valve closes and hydraulic pumps pressurize oil to drive the piston. The disc opens against combined spring and gas pressure forces. At full open position, pumps deactivate with only the relief valve consuming power.

Power interruption opens the relief valve, causing rapid disc closure and gas flow interruption. Figure 1 illustrates the VMH valve mechanism, typically installed in gas trains for industrial and combustion systems. Figure 2 demonstrates a typical installation with complementary Elektrogas devices.

Material/Connections

• AISI: DN65 … DN200

Gas Type

• Air and non-aggressive gases (Family 1-2-3, EN 437)
• Special version for Biogas/COG

Approvals

• EC-type tested and certified according to EN 161

Operating pressure

• 0 - 200 mbars
• 0 - 500 mbars
• 0 - 1300 mbars
• 0 - 1600 mbars

More information please click

• Catalog VMH Automatic Safety Valve
• CE Certifications VMH Automatic Safety Valve

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