ELEKTROGAS – TECHNICAL MANUAL
3-13
Functioning and
application The VML 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.
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 slowly because of the hydraulic brake, against the
strength of the spring and gas pressure. The rapid stroke may be adjusted using the regulating
screw on the top (see the Installation, adjustment and servicing section), to adjust the initial gas
flow. Main flow and opening time can be adjusted also.
If the power supply is shut off, the valve rapidly closes, interrupting the gas flow.
Fig.1
This kind of valve is normally installed as safety and regulating device in gas trains, for industrial
applications and gas firing systems.
Figure 2 shows an example of installation.
Fig.2
WARNING
Location and mode of installation must be in compliance with local rules in force.
Fast opening
solenoid valve
Gas
network
Consumer
Slow opening
solenoid valve
Ball
valve
Valve
leak
teste
Gas
filter
Pressure
regulator
Pressure
switch
Pressure
gauge
Hydraulic
brake
Hydraulic
brake
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