Elektrogas Proportional valve LMV2 3/4"

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. 2-9  ELEKTROGAS – Scheda tecnica EI185 - 0618 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 3-9  ELEKTROGAS – Scheda tecnica EI185 - 0618 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) 4-9  ELEKTROGAS – Scheda tecnica EI185 - 0618 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 5-9  ELEKTROGAS – Scheda tecnica EI185 - 0618 Gas Flow Chart Fig.4 Fig.5 6-9  ELEKTROGAS – Scheda tecnica EI185 - 0618 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). 7-9  ELEKTROGAS – Scheda tecnica EI185 - 0618 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.…