ELEKTROGAS – MANUALE TECNICO
3-12
Functioning and
application
The EVRM-NC type valve is a manual reset safety valve that is normally closed. When not in
working position the spring works on the shutter keeping the gas orifice closed. Simply by
energizing the coil the valve does not open. It is necessary to manually move the reset rod
located at the top of the coil. Once opened, the valve can maintain this position until electric
current circulates on the coil. In absence of electric current the valve closes rapidly and remains
shut upon return of same. Once the causes for the lock have been eliminated, valve must be
opened manually as described above.
Fig.1
The /6NC versions are provided with a dual-shutter system for pressure compensation. To open
the valve pull the knob for the first step, wait for pressure compensation, and then pull the knob
completely up to full resetting (from 3/4" to 6”).
This kind of device is normally installed downstream a manual shut-off valve and upstream of
the gas regulating train. Figure 2 shows a example of installation.
Fig.2
WARNING
Location and mode of installation must be in compliance with local rules in force.
Gas
detector
Solenoid valve
manual reset
Gas
network
Consumer
