Elektrogas Proportional flow control valves

[{"filename":"LMV_en.pdf","text":"LMV\n Linear control valves\n\n DN20-DN80\n\n\n\n\ndelta-elektrogas.com EE185 - 0924\n\f ELEKTROGAS – Scheda tecnica EE185 - 0924\n\n\n\nLMV\nLinear control valves\n\n\nIndice\n Description ……………………………………..........…... 2\n Features …….……..……………………………….......... 2\n Functioning and application ….……………………........ 3\n Technical specifications .……………………………....... 4\n Gas flow chart …………………………..……..……........ 6\n Actuator connection………………………………………. 8\n Order information ………………….……………............. 9\n Special versions and options ……..…….…………........ 9\n Installation and maintenance …………………............... 10\n Standards and approvals …………..…..…………........... 10\n\n\n\n\nDescription Modulating valves LMV are used in combustion processes that require linear adjustment of air or\n gas flow. The flow varies proportionally to the opening angle of inner orifice, therefore flowrate is\n very predictable. The valve can be operated with stage control (3-point, MZ3 servomotor) or with\n continuous modulation (analogue signals, MZ5 servomotor)..\n\n\n\nFeatures Valve housing is made of aluminum alloy with connections from 3/4” to 3”.\n\n Suitable for use with air and non-aggressive gases included in the 1st, 2nd and 3rd families (EN\n 437). Special versions for aggressive gases (Biogas).\n Linear ratio of opening angle to flow rate.\n Working ratio till 25:1, low pressure drop and limited gas leakage when mechanism is in minimum\n position.\n Full gas orifice and reduced gas orifice are available for each size, to meet specific plant\n requirements.\n Maximum flow can be easily regulated.\n Metal mesh in the inlet prevents contamination of the inner mechanism.\n\n On request, an adjustable bypass can be installed to set up precisely the flow rate in minimum\n position.\n Suitable to be driven by MZ series servomotors.\n Combined system LMV + MZ is designed to reduce overall dimensions.\n MZ servomotors can be supplied in Ex-proof version, suitable for installation in Zone 2 and 22,\n according to Directive 2014/34/UE (ATEX). Please refer to MZ tech data for further details.\n All components are designed to withstand any mechanical, chemical and thermal condition\n occurring during typical service. Effective impregnation and surface treatments have been used\n to improve mechanical sturdiness, sealing and resistance to corrosion of the components.\n Valves are 100% tested and fully warranted.\n\n\n\n\n 2-10\n\f ELEKTROGAS – Scheda tecnica EE185 - 0924\n\n\nFunctioning and\napplication\n LMV works by means of a double cylinder mechanism, allowing a linear variation of the flow\n according to position, thanks to specifically shaped gas orifices. Outer cylinder is fixed while inner\n cylinder can be rotated by the actuator, opening or closing the gas passage. Maximum flow can\n be adjusted easily to set up the optimal working condition of the valve. Materials and mechanical\n tolerances are designed to assure low leakage, repeatability of the performance and reliability.\n Figures 1 and 2 show some typical application examples.\n\n\n\n\n Fig.1 - LMV valve on the air line and gas ratio regulator.\n\n\n\n\n Fig. 2 - LMV valve on the gas line for correcting the Lambda parameter.\n\n\n\n\n 3-10\n\f ELEKTROGAS – Scheda tecnica EE185 - 0924\n\n\n\n\nTechnical\nspecifications\n\n Tab. 1\n\n Connections Threaded f/f EN 10226-1 from Rp3/4 to Rp2½\n Flanged PN16 ISO 7005 DN40 to DN80\n On request:\n ANSI-ASME B1.20 from 3/4”NPT to 2”½NPT\n ANSI-ASA-ASME B16.5 class 150 from 2” to 3”\n\n\n Control ratio 25:1\n\n\n Ambient temperature -15°C... +60°C\n\n\n Max working pressure 500 mbar (50 kPa)\n\n\n Flow capacity See flow charts or tab. 2 - coefficient Kv\n Complete opening\n\n Leakage rate < 2% of Kv\n Valve closed\n\n Filtering element 600 µm\n\n\n Materials in contact Aluminum alloy\n with gas Brass\n Stainless steel\n Plated steel\n Anaerobic adhesive\n Nitrile rubber (NBR)\n Fluoro elastomer (FPM)\n Acetal resin (POM)\n\n\n Voltage rate 230 VAC 50/60 Hz\n Servomotor MZ 110 VAC 50/60 Hz\n 24 VAC/DC\n (depending on servomotor type)\n\n\n 90° opening / closing time 7…90 sec (depending on servomotor type)\n\n\n\n\n 4-10\n\f ELEKTROGAS – Scheda tecnica EE185 - 0924\n\n\n\n\n Fig.3\n Tab. 2\n\n Overall dimensions [mm] Flow factor Kv [m3/h]\n (2)\n Weight Full Reduced Micro\n Conn. A B C(1) D Int h (Kg) orifice orifice orifice\nRp 3/4 88 96 200 34 - - 0.7 8.06 4.35 1.58\n\nRp 1 88 96 200 34 - - 0.7 8.06 4.35 1.58\n\nRp 1¼ 120 153 235 43 - - 1.7 23.5 14.0 -\n\nRp 1½ 120 153 235 43 - - 1.7 23.5 14.0 -\n\nRp 2 106 156 240 47 - - 1.9 23.5 14.0 -\n\nRp 2½ 179 218 261 55 - - 4.6 56.6 28.5 -\n\nDN 40 163 196 240 75 110 4x18 3.2 23.5 14.0 -\n\nDN 50 163 196 240 75 125 4x18 3.2 23.5 14.0 -\n\nDN 65 180 305 275 89.5 145 4x18 7.5 56.6 28.5 -\n\nDN 80 180 305 275 89.5 160 8x18 7.5 56.6 28.5 -\n (1) when a lever joint is installed (LMV..L), add 28mm\n (2) excluding servomotor (2.4 Kg)\n\n\n 5-10\n\f ELEKTROGAS – Scheda tecnica EE185 - 0924\n\n\nGas Flow Chart\n\nFormula of conversion from air to other gases: Gas type Specific gravity\n ρ\n GAS = k∙ AIR [Kg/m³]\n (1) Natural gas 0,80\n (2) LPG 2,00\n ρAIR (3) Air 1,225\nk=√\n ρGAS 15°C, 1013 mbar, dry\n\n MA\n dP inc min\n 0.5\n 0.4 1.0 10 20 30\n 0.6 40\n 50\n 0.7\n 0. 2 3 4 5\n 6\n 7 60\n 70\n 5000 0 100\n 4000 70\n 100 60 0\n 70\n 3000 0 50 60\n 70\n 60 40 50\n 2000 50 40\n…