ELEKTROGAS – TECHNICAL MANUAL
2-12
EVRM-NA
EVRM-6NA
Safety solenoid valves for gas
Manual reset - Normally open
Contents
Description ………………………………………….. 2
Features …………………………………………….. 2
Functioning and application ………………………. 3
Special versions and optionals …………………… 4
Technical specifications …………………………… 4
Gas flow chart (pressure drop) …………………… 6
Ordering information ………………………………. 8
Standards and approvals …………………………. 9
Installation and servicing ………………………….. 10
Description
The EVRM-NA /6NA type valve is a manual reset safety valve that is normally open. The closing
function is electrically activated. This type of device, connected to one or more gas leakage
detectors, safety thermostat or alarm signals for the presence of carbon monoxide, is suitable to
perform locking operations on the gas line
.
Features
The valves are made of aluminum alloy die-cast (or hot-pressed brass for OT versions), with a
wide range for inlet/outlet connections from DN10 up to DN 200.
Pipe connections meet group 2, according to EN161 requirements.
Suitable for use with air and non-aggressive gases included in the 1, 2 and 3 families (EN 437).
Two range of operating pressure: low pressure (0…600 mbar) and medium pressure (0…6 bar).
The valves are normally not powered allowing a remarkable energy saving.
An incorporated fine mesh filter protects the valve seat and disc as well as downstream
components and prevents dirty contamination (except brass models).
Provided with G1/4 pressure gauge on two sides in the inlet chamber (except brass models), to
connect manometers, pressure switches, leakage tester or other gas equipments. Flanged
models are provided with gauges also in the outlet chamber.
The encapsulated coil is provided with ISO 4400 plug and suitable cable gland to avoid water
and dirty contamination, allowing a safe outdoor installation.
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 by computerized testing machineries and are fully warranted.
WARNING
This control must be installed in compliance with the rules in force.
