Elektrogas EVRM-NA Series User manual

Printed in Italy - EE167/0105
EVRM-NA
Safety solenoid valves for gas
Manual reset - Normally open
DN10 … DN200
EVRM-NA6 / EVRM-NA9
Certified Quality System
www.elektrogas.com

2Printed in Italy - EE167/0105
EVRM-NA
Safety solenoid valves for gas
Manual reset - Normally open
The EVRM-NA type valve is a manual reset safety valve
that is normally open. This type of device, connected
with one or more gas leakage detectors or alarm signals
for the presence of carbon monoxide, is suitable for
performing locking operations on the gas line.
The EVRM-NA type valves are made in accordance with
EN161 standard (when applicable). All models are
conforming with the European Directives 89/336 EEC
and 73/23 EEC.
1- Features
Wide range for inlet/outlet connections, from 3/8” to
8” pipes sizing.
Provided with G1/4” pressure gauge on two sides in
the inlet pressure chamber (except brass models).
Others gauge points on request.
Optional G1/8” connection for closed position
indicator micro switch (on request from 3/4" to 8").
Fine mesh filter incorporated to prevent dirty
contamination of the seal seat (except brass
models).
Maximum operating pressure 500 mbar.
Suitable for air and non-aggressive gases (EN 437,
1, 2 and 3 families).
Coil insulation is class H (180°C).
Terminals with DIN 43650 plug and PG connector.
Valves are 100% tested by computerized testing
machineries and are fully warranted.
For valve identification see the following charts.
WARNING
- This control must be installed in compliance with
the laws in force.
- Read instructions before use.
- Elettromeccanica Delta S.p.a. reserves the right
to update or make technical changes without
prior notice.
Fig. 1
2- Technical specifications
Connections ………………..Gas threaded ISO 7/1
from Rp3/8 to Rp2
Flanged PN16 – ISO 7005
from DN40 to DN200
Voltage rating ……………...230 VAC 50/60 Hz
Voltages on request ……….110 VAC 50/60 Hz
24 V AC/DC
12 VDC
Voltage tolerance …………. -15% / +10%
Power consumption ………. see charts
Environment temperature …-15°C / +60°C
Max. working pressure …… 500 mbar
Flow capacity ……………… see charts
Disc sealing …..…………… NBR
Closing time ……………….. < 1 sec.
Protection class …………… IP 54 (EN60529)
Cable gland …………………PG09
Overall dimensions ……….. see charts

3Printed in Italy - EE167/0105
3- Operation
The EVRM-NA type valve is a manual reset safety valve
that is normally open. A manual operation is therefore
necessary to open the valve and set the mechanism
consenting to maintain this state. The powering by
means of line current and/or condenser discharge,
induced by the leakage detector, causes tripping of the
mechanism and consequent closing of the gas passage.
If energizing of the sensor persists due to the presence
of gas, the valve remains under power and does not
allow reset. When the causes for locking have been
eliminated, valve must be opened manually.
4- Accessories
A fine mesh filter is provided, to prevent dirty
contamination of the seal seat. However, an external
strainer must be installed upstream of the valve. Brass
models are available without internal filter only.
Inlet pressure chamber is provided with bilateral G1/4"
gauges, to connect min/max adjustable pressure
switches, leakage tester or other gas equipments.
Flanged models are provided with gauges in the outlet
chamber too. Brass models are available without gauges
only.
On request, valves are supplied with a G1/8” connection
on the bottom, to installed a closed position indicator
micro switch (from 3/4" to 8"). An adapting rod is
provided too.
5- Coil features
Coil and DIN plug are provided with suitable gaskets, to
avoid water and dirty contamination (see the Service
Instruction Section).
Fig. 2
6- General information
Maximum testing pressure is 1500 mbar.
All components are design to withstand any
mechanical, chemical and thermal condition
occurring during typical service.
Effective impregnation and surface treatments has
been used to improve mechanical sturdiness,
sealing and resistance to corrosion of the
components.
Valves are suitable for use with air and non-
aggressive gases included in the 1, 2 and 3 families
(EN 437).
Materials in contact with gas:
•Aluminium
•Brass
•Stainless steel
•Plated steel
•Anaerobic adhesive
•Nitrile rubber (NBR)
•Polytetrafluoroethylene (PTFE)
•Fluoroelastomer (FPM)

4Printed in Italy - EE167/0105
7- Valve identification
Connections type
Threaded Flanged 230 VAC 110 VAC 24 V AC/DC (0) 24 VDC-22W 12 VDC 12 VDC-22W
Rp 3/8 brass EVRMNA0AO EVRMNA0BO EVRMNA0CO EVRMNA0COW EVRMNA0DO EVRMNA0DOW
Rp 1/2 brass EVRMNA1AO EVRMNA1BO EVRMNA1CO EVRMNA1COW EVRMNA1DO EVRMNA1DOW
Rp 3/4 brass EVRMNA2AO EVRMNA2BO EVRMNA2CO EVRMNA2COW EVRMNA2DO EVRMNA2DOW
Rp 1 brass EVRMNA3AO EVRMNA3BO EVRMNA3CO EVRMNA3COW EVRMNA3DO EVRMNA3DOW
Rp 3/8 EVRMNAA0A EVRMNA0B EVRMNA0C EVRMNA0CW EVRMNA0D EVRMNA0DW
Rp 1/2 EVRMNA1A EVRMNA1B EVRMNA1C EVRMNA1CW EVRMNA1D EVRMNA1DW
Rp 3/4 EVRMNA2A EVRMNA2B EVRMNA2C EVRMNA2CW EVRMNA2D EVRMNA2DW
Rp 1 EVRMNA3A EVRMNA3B EVRMNA3C EVRMNA3CW EVRMNA3D EVRMNA3DW
Rp 1¼ EVRMNA35A EVRMNA35B EVRMNA35C EVRMNA35CW EVRMNA35D EVRMNA35DW
Rp 1½ EVRMNA4A EVRMNA4B EVRMNA4C EVRMNA4CW EVRMNA4D EVRMNA4DW
Rp 2 EVRMNA6A EVRMNA6B EVRMNA6C EVRMNA6CW EVRMNA6D EVRMNA6DW
DN 40 (1) EVRMNA4FA EVRMNA4FB EVRMNA4FC EVRMNA4FCW EVRMNA4FD EVRMNA4FDW
DN 50 (1) EVRMNA6FA EVRMNA6FB EVRMNA6FC EVRMNA6FCW EVRMNA6FD EVRMNA6FDW
230 VAC 110 VAC 24 VDC 12 VDC
DN 65
EVRMNA7A EVRMNA7B EVRMNA7C EVRMNA7D
DN 80
EVRMNA8A EVRMNA8B EVRMNA8C EVRMNA8D
DN 100
EVRMNA9A EVRMNA9B EVRMNA9C EVRMNA9D
DN 125
EVRMNA93A EVRMNA93B EVRMNA93C EVRMNA93D
DN 150
EVRMNA95A EVRMN95B EVRMNA95C EVRMNA95D
DN 200
EVRMNA98A EVRMN98B EVRMNA98C EVRMNA98D
Fig. 3
Connections
Overall dimensions
(mm)
Model
Threaded Flanged
Max.
Pressure
(mbar)
Power
Consump.
@230VAC
(W) A B C D Int h
Weight
(Kg)
EVRMNA0/O Rp 3/8 500 16 30 58 115 130 - - 0,4
EVRMNA1/O Rp 1/2 500 16 30 58 115 130 - - 0,4
EVRMNA2/O Rp 3/4 500 16 35 55 113 130 - - 0,6
EVRMNA3/O Rp 1 500 16 40 62 115 137 - - 0,7
EVRMNA0 Rp 3/8 500 16 70 77 130 148 - - 0,6
EVRMNA1 Rp 1/2 500 16 70 77 130 148 - - 0,6
EVRMNA2 Rp 3/4 500 16 85 96 138 165 - - 0,8
EVRMNA3 Rp 1 500 16 85 96 138 165 - - 0,8
EVRMNA35 Rp 1¼ 500 16 120 153 162 195 - - 1,6
EVRMNA4 Rp 1½ 500 16 120 153 162 195 - - 1,6
EVRMNA6 Rp 2 500 16 106 156 167 205 - - 1,9
EVRMNA4F DN 40 (1) 500 16 150 193 170 245 110 4x18 3,3
EVRMNA6F DN 50 (1) 500 16 165 196 175 257 125 4x18 3,9
EVRMNA7 DN 65 500 19 200 305 260 (2) 350 (2) 145 4x18 8,2
EVRMNA8 DN 80 500 19 200 305 260 (2) 350 (2) 160 8x18 8,2
EVRMNA9 DN 100 500 19 252 350 280 (2) 410 (2) 180 8x18 16
EVRMNA93 DN 125 500 19 310 460 330 (2) 500 (2) 210 8x18 28
EVRMNA95 DN 150 500 19 310 460 330 (2) 500 (2) 240 8x23 30
EVRMNA98 DN 200 500 19 370 546 380 (2) 590 (2) 295 12x23 45
(0) Impulsive operation only (1) Optional kit (2) Valve open

5Printed in Italy - EE167/0105
dP [mbar]
DN 125
DN 80
DN 65
DN 100
DN 150
dP [mmH O]
2
Natural gas Town gas Air
V [m³/h]
1"½
3/4"-OT
3/8"-OT
1/2"-OT
1"-OT 1/2"
3/8"
3/4"
1"¼
2"
1"
DN 200
Liquid gas
8- Loss of pressure
Formula of conversion from air to other gases
+15°C, 1013 mbar, dry
Gas type Specific gravity
(Kg/m³) K
Air 1,25 1,00
Natural Gas 0,80 1,25
Town Gas 0,57 1,48
Liquid Gas 2,08 0,77

6Printed in Italy - EE167/0105
9- Valve installation
Verify the line pressure is lower of the maximum working
pressure admitted to the valve.
Check correspondence of flow direction with arrow
printed on valve body.
Check correct alignment of connecting pipes.
Remove the end caps and make sure no foreign
body is entered into the valve during handling.
Install in an area that is protected from rain and
water splashes or drops.
Threaded models:
1. Put sealing agent onto the pipe thread (avoid
excessive quantities of fittings glue which could
enter in the valve and damage the seal seat).
2. Screw the pipes using proper tools only. Do not use
unit as lever because damage to the valve stem
could result.
Flanged models:
1. Position the gasket and insert the bolts.
2. Screw the nuts tightening them crosswise and using
proper tools only.
Avoid overtightening and mount tension free.
Following chart shows the maximum values of bending
moment (Fmax), torque (Tmax) and screws driving torque
(Cmax), according to EN161.
Connections Fmax
(Nm) t<10 s Tmax (Nm) Cmax (Nm)
Rp3/8 70 35 -
Rp1/2 105 50 -
Rp3/4 225 85 -
Rp1 340 125 -
Rp1¼ 475 160 -
Rp1½ DN40 610 200 50
Rp2 DN50 1100 250 50
DN65 1600 - 50
DN80 2400 - 50
DN100 5000 - 80
DN125 6000 - 160
DN150 7600 - 160
DN200 7600 - 160
Fig. 4
Valve may be mounted with coil in horizontal or vertical
position. Coil may be oriented 360 degrees in any
direction.
10- Electrical connections (IEC 730-1)
Check correspondence between valve voltage rating and
line power supply, before making any electrical
connections.
1. Switch off power supply and remove protection
cover.
2. Connect power cables to connector plug terminal
board.
3. Screw back the plug cover, taking care to use all
gaskets properly, because this could condition the
valve life duration.
Fig. 5
WARNING
•To prevent product damage and dangerous
situations, read the Installation and Service
Instructions carefully.
•Turn off all power before servicing any part of
the system.
•Perform leak and functional tests after mounting.
A gas leak detection spray may be used also.
•Coil and DIN plug must be replaced with identical
spare parts only.
•If the coil is turned, make sure the cap is
properly tightened and the coil is locked.
•Use all gaskets properly (void warranty).
•All wiring must be in compliance with local and
national codes.
•Make sure all works are performed by qualified
technicians only.
Fmax
Tmax
Cmax

7Printed in Italy - EE167/0105
11- Maintenance
To maintain a good performance of the system, almost
once a year, an inspection of the valve is recommended.
External inspection
Turn off all power before servicing any part of the
system.
Check the conditions of the DIN plug gasket. If gasket is
deteriorated, replace it with a new one.
Check the electrical connections are clean, dry and
correctly tightened.
Check the conditions of pipe connections: cover them
with a soap solution and check for leakages.
Check the proper operation of the valve: power the coil
and verify the valve closing.
Internal inspection
If the valve does not work properly, do not dismount
the resetting mechanism, but replace it with a new
one.
Threaded models:
1. Close ball valve upstream the system.
2. Reset the valve (valve open).
3. Unscrew the knob, but do not remove the nut below.
This to avoid the accidental dismounting of the
resetting mechanism.
4. Remove the locking nut and the coil.
5. Using an Allen key, remove the screws on the upper
flange, in cross way. The gas in the valve will come
out during this step.
6. Check the main O-ring. If it’s necessary, replace it.
7. Blow the spring with compressed air and check it is
corrosion free.
8. Check the conditions of the sealing gasket. If gasket
is deteriorated, replace it with a new one.
9. Clean the sealing lip with a clean cloth. Do not use
tools, because a lip damage could result.
10. Remove the filter and blow it with compressed air.
11. Reassemble the valve following the inverse
sequence.
Flanged models:
1. Close ball valve upstream the system.
2. Unscrew the knob.
3. Using an Allen key, remove the screws on the upper
flange, in cross way. The gas in the valve will come
out during this step.
4. Check the main O-ring and the rod O-ring. If it’s
necessary, replace them.
5. Remove the spring and blow it with compressed air.
Check the spring is corrosion free.
6. Clean the disc assembly with a clean cloth and
compressed air. Grease the rod O-ring.
7. Check the conditions of the sealing gasket. If gasket
is deteriorated, replace it with a new one.
8. Clean the sealing lip with a clean cloth. Do not use
tools, because a lip damage could result.
9. Remove the filter and blow it with compressed air.
10. Reassemble the valve following the inverse
sequence.
To insert the rod inside the flange assembly, power the
coil and, using a screw driver, move the pin to allow the
rod inserting.
When the reassembly is finished, verify the correct
sealing between the upper flange and the valve body:
1. Open ball valve to restore pressure into the valve.
2. Apply a soap solution between the upper flange and
the valve body and check for leakages.
3. Remove the soap solution with a clean cloth and
compressed air.
WARNING
•When reassemble, use all gaskets properly.
•Perform functional test after mounting.
•All works must be executed by qualified
technicians only and in compliance with local
and national codes.