Description
DN300 PN16 Gas Safety Shut-Off Valve EN161 Elektrogas VMH912U
The Elektrogas VMH912U is a DN300 (12") PN16 flanged, 2/2 way normally closed gas safety shut-off valve with hydraulic actuator, designed for automatic isolation of natural gas, LPG, air and compatible non-aggressive gases.
Designed for gas trains, industrial burners, atmospheric gas boilers, kilns and other gas-consuming equipment, the VMH912U uses a powered hydraulic actuator to open the valve against spring and gas pressure.
The valve remains open only while electrically energised. If electrical power is removed, the hydraulic relief valve opens and the valve closes rapidly, automatically interrupting the gas flow for fail-safe operation.
Technical Specification
Model: Elektrogas VMH912U
Function: 2/2 way normally closed
Operation: Electro-hydraulic actuated gas safety shut-off valve
Connection: DN300 (12") PN16 flange, ISO 7005
Maximum pressure: 0.6 bar / 600 mbar
Kvs flow factor: 970 m³/h
Opening time: 45–75 seconds*
Maximum operating frequency: 15 cycles per hour
Media: Air and non-aggressive gases in gas families 1, 2 and 3 according to EN 437
Body: Aluminium alloy
Materials in contact with gas: Aluminium alloy, brass, stainless steel, plated steel, NBR, FPM and PTFE
Filter: Integrated 600μm metal mesh
PCS closed-position switch: Closed-position indication feedback switch included as standard
Pressure monitoring: G1/4 pressure gauge ports on both sides of the inlet and outlet chambers
Standard voltage: 230V AC 50/60Hz
Voltage option: 110V AC 50/60Hz
Voltage tolerance: -15% / +10%
Power consumption: 25VA holding / 115W starting
Duty: Continuous service, 100% ED
Ambient temperature: -15°C to +60°C
Protection: IP65 according to EN 60529
Electrical connection: ISO 4400 plug with PG9 cable gland
Actuator indication: LED indicates when actuator is energised
*Opening time depends on ambient temperature, actual supply voltage and inlet pressure.
Fail-Safe Hydraulic Operation
When de-energised, an internal spring holds the sealing disc closed. Inlet gas pressure acts on the disc and further assists the seal.
When electrical power is applied, the hydraulic relief valve closes and the pump pressurises the actuator oil, moving the piston and opening the valve against the combined spring and gas pressure.
Once fully open, the hydraulic pump switches off and only the relief valve consumes power.
If electrical power is interrupted, the relief valve opens and the disc closes rapidly, automatically shutting off the gas supply.
Gas Safety Applications
The VMH912U is designed for use as a safety shut-off and regulating valve in installations including:
✓ Industrial gas trains
✓ Gas-fired burners
✓ Atmospheric gas boilers
✓ Industrial kilns and furnaces
✓ Commercial gas equipment
✓ Large industrial gas isolation systems
Pressure Gauge & Monitoring Ports
G1/4 pressure ports are provided on both sides of the inlet and outlet chambers, allowing connection of:
✓ Pressure gauges
✓ Pressure switches
✓ Valve leakage testers
✓ Other compatible gas monitoring equipment
Included Equipment & Optional Versions
PCS Closed Position Switch: Included as standard for positive indication that the valve has fully closed.
ATEX Version: Explosion-protected execution available for hazardous-area applications.
Biogas Version (J): Special construction available for biogas.
Coke Oven Gas Version (K): Special construction available for coke oven gas.
110V AC: Alternative supply voltage available.
Certifications & Compliance
EN161 gas safety shut-off valve
Pressure Equipment Directive 2014/68/EU
Electromagnetic Compatibility Directive 2014/30/EU
Low Voltage Directive 2014/35/EU
RoHS II 2011/65/EU
ATEX 2014/34/EU when specified on the product
Installation Notes
The VMH912U may be installed in horizontal or vertical pipework. For vertical pipe installation, gas flow must be from bottom to top and the actuator electrical plug must face upwards.
The installation location must be protected from rain, water splashes and dripping water.
Correct gas type, operating pressure, flow rate, ambient temperature and electrical supply must be confirmed before installation.
After installation, perform the appropriate gas leak and functional tests in accordance with applicable regulations and the manufacturer's instructions.
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