Datasheet Content
LMV
Linear control valves
DN20-DN80
delta-elektrogas.com EI185 - 0618
ELEKTROGAS – Scheda tecnica EI185 - 0618
LMV
Linear control valves
Indice
Description ……………………………………..........…... 2
Features …….……..……………………………….......... 2
Functioning and application ….……………………........ 3
Technical specifications .……………………………....... 4
Gas flow chart …………………………..……..……........ 6
Ordering information ………………….……………......... 8
Special versions and options ……..…….…………........ 8
Installation and maintenance …………………............... 9
Standards and approvals …………..…..…………........... 9
Description Modulating valves LMV are used in combustion processes that require linear adjustment of air
or gas flow. The flow varies proportionally to the opening angle of inner mechanism, therefore
flowrate is very predictable. The valve can be operated with stage control (3-point, MZ3
servomotor) or with continuous modulation (analogue signals, MZ5 servomotor)..
Features Valve housing is made of aluminum alloy, with range of pipe connections from 3/4” to 3”.
Suitable for use with air and non-aggressive gases included in the 1st, 2nd and 3rd families (EN
437). Special versions for aggressive gases (Biogas or COG).
Linear ratio of opening angle to flow capacity.
Working ratio till 25:1, low pressure drop and limited gas leakage when mechanism is in
minimum position.
Full gas orifice and reduced gas orifice are available for each size, to meet specific plant
requirements.
Maximum flow regulation is available as standard and easily adjustable.
Metal mesh in the inlet prevents contamination of the inner mechanism.
On request, an adjustable bypass can be installed to set up precisely the flow rate in minimum
position.
Suitable to be driven by servomotors MZ3 and MZ5.
Combined system LMV + MZ is designed to reduce overall dimensions.
MZ servomotors can be supplied in Ex-proof version, suitable for installation in Zone 2 and 22,
according to Directive 2014/34/UE (ATEX). Please refer to MZ tech data for further details.
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 and fully warranted.
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Functioning and
application
LMV works by means of a 2-cylinder mechanism, allowing a linear variation of the flow
according to mechanism position, thanks to specifically shaped gas orifices. Outer cylinder is
fixed while inner cylinder can be rotated by the actuator, opening or closing the resulting gas
passage. A flow adjustment is present and can be regulated acting on an external screw to set
up easily the optimal working condition of the valve. Materials and mechanical tolerances are
designed to assure low leakage, repeatability of the performance and reliability.
Flow restricting Flow modulating
cylinder cylinder
(fixed) (rotating)
Fig.1
Fig. 2 shows an example of installation.
VMM
mutliple valve air : gas
ratio
controller
RAG
Ball
valve FG
filter
LMV linear valve
MZ servomotor
Fig.2
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Technical
specifications
Tab. 1
Connections Threaded f/f ISO 7-1 from Rp3/4 to Rp2½
Flanged PN16 ISO 7005 DN40 to DN80
Working ratio 25:1
Ambient temperature -15°C... +60°C
Max working pressure 500 mbar (50 kPa)
Flow capacity See flow chart
Filtering element 600 µm
Materials in contact Aluminum alloy
with gas Brass
Stainless steel
Plated steel
Anaerobic adhesive
Nitrile rubber (NBR)
Fluoro elastomer (FPM)
Polytetrafluoroethylene (PTFE)
Acetal resin (POM)
Voltage rate 230 VAC 50/60 Hz
Servomotor MZ 110 VAC 50/60 Hz
24 VAC/DC
(depending on servomotor type)
90° opening / closing time 7,5…120 sec (depending on servomotor type)
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Fig.3
Tab. 2
Overall dimensions [mm]
Conn. A B C(1) D Int h E (2)
Rp 3/4 88 96 200 34 - - -
Rp 1 88 96 200 34 - - -
Rp 1¼ 120 153 235 43 - - 62.5
Rp 1½ 120 153 235 43 - - 62.5
Rp 2 106 156 240 47 - - 62.5
Rp 2½ 179 218 261 55 - - 101.5
DN 40 (3) 150 193 240 75 110 4x18 62.5
DN 50 (3) 165 196 240 82.5 125 4x18 62.5
DN65 180 305 275 89.5 145 4x18 101.5 (1) when a lever joint is installed, add 28mm.
(2) Dimension with bypass installed
DN80 180 305 275 89.5 160 8x18 101.5
(3) Option kit for flanged connection
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Gas Flow Chart
Fig.4
Fig.5
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Fig.6
Formula of conversion Tab. 3
from air to other gases Gas type Specific gravity
1.25
ρ k=
[Kg/m³] ρGAS
VGAS = k ⋅ VAIR Air 1,25 1,00
Natural gas 0,80 1,25
Town gas 0,57 1,48
LPG 2,08 0,77
15°C, 1013 mbar, dry
For optimal flow control and a linear characteristic, it is advisable to maintain the
pressure drop ∆p close to 30% of the inlet pressure p1.
Example:
Select a valve for a gas flow of Qn= 60 Nm3/h and a pressure p2 = 70 mbar.
p2 r
p 3 a
b
m
. 30
0
0
3
∆ = 1 =
− .
From the diagrams of the LMV type valves, the size that can guarantee the required
flow rate is the 3/4 "-1" with full passage (Fig.4).
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Ordering Information
LMV 3 1 M C
Model
LMV Linear valve (actuator not included)
Connection
2 3/4"
3 1"
35 1" 1/4
4 1" 1/2
6 2"
7 2” 1/2
4F DN40
6F DN50
7F DN65
8F DN80
NPT threads available on request (N version)
ANSI flanges available on request (N version)
Gas orifice
_ Full gas orifice
1 Reduced gas orifice
Pressure test points and bypass
_ Pressure test point at the inlet
A Additional pressure points at the outlet (not applicable to DN20-25)
M Adjustable bypass
Actuator connection
_ without joint, 8 square shaft
C compact joint (standard)
L joint with lever
R joint with special lever to connect remote actuators or manual lever
When LMV is coupled to a servomotor, complete product code adding model of servomotor (see MZ tech sheets).
Special versions
and options
Additional test points G1/4 at the outlet (not applicable to DN20-25).
Adjustable by-pass suitable for setting up a very low minimum flow rate.
Joint with lever to connect multiple LMV to the same servomotor (Notice: C dimension
must be increased of 28 mm).
Special joint to connect remote actuator.…
