Elektrogas Multiblock VMM255AS00 D25 500Mb (slow valve without by-pass)

VMM Multiple safety solenoid valve for gas regulating trains DN20 … DN80 delta-elektrogas.com EE163 -01/19  ELEKTROGAS – Technical Sheet EE163 - 01/19 VMM Multiple safety solenoid valve for gas regulating trains Contents Description ………………………………………….. 2 Features …………………………………………….. 2 Functioning and application ………………………. 3 Technical specifications …………………………… 4 Gas flow chart (pressure drop) …………………… 6 Ordering information ………………………………. 8 Special versions and optionals …………………… 9 Design, installation and servicing ........................ 10 Standards and approvals …………………………. 11 Description The VMM type valve is a combination of two solenoid valves in an only compact and versatile valve housing. This type of device is suitable for air or gas blocking and releasing controls (with one or two stages operation), required in gas power burners, atmospheric gas boiler, industrial kilns and others gas consuming appliances. Features The valves are made of aluminum alloy die-cast, with a range for inlet/outlet connections from DN20 (3/4”) up to DN80 (3”). Sealings are made of NBR-based rubber certified for use with gas (EN 549). Pipe connections meet group 2 and backpressure sealing is compliant with class A, according to EN161 requirements. A third valve with capacity of DN15 or DN25 can be fitted to by-pass the second one and have a low fire stage or a second outlet for pilot burner (pilot execution). Suitable for use with air and non-aggressive gases included in the 1, 2 and 3 families (EN 437). Special versions for aggressive gases. The whole range can be provided in Ex-proof execution, for use in Zones 2 and 22, according to 2014/34/EU Directive (ATEX). The valve is open only when energized: if, for any reason, power supply goes down, the valve closes immediately (intrinsic safe). Suitable for heavy-duty cycle operation and qualified for continuous service (100% ED). Equipped with flow rate adjustment. An incorporated fine mesh filter protects the valve seat and disc as well as downstream components and prevents dirty contamination. Provided with bilateral pressure ports on two sides in all pressure chambers, to connect manometers, pressure switches, leakage tester or other gas equipments. The coils are provided with terminal box or with ISO 4400 plug. Both systems are provided with suitable cable gland to avoid water and dirty contamination. The normally open vent valve VMRNA can be integrated in VMM from 1”¼ to 3”; dimensions and piping are the same of third pilot valve. See VMRNA datasheet for other 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 by computerized testing machineries and are fully warranted. 2-11  ELEKTROGAS – Technical Sheet EE163 - 01/19 Functioning and application The VMM type valve is a safety shutting device using auxiliary power supply. The first valve (A) is a fast opening safety solenoid valve. When it is de-energized, the spring pushes on the seal disc, keeping the gas passage closed. Now, the inlet chamber is under the gas line pressure, and it forces on the disc too, improving the seal. When the coil is powered the valve opens rapidly, against the strength of the spring and gas pressure. If the power supply is shut off, the valve rapidly closes, interrupting the gas flow. Equally, the second valve (B) may be a fast opening or a slow opening solenoid valve to adjust the gas flow, with a first adjustable fast stroke and a second adjustable slow stroke. It is possible to connect a third by-pass valve (C), which works as low fire stage or to obtain a second fast (slow) stroke or both. 1 = Ball valve 2 = Filter 3 = Pressure regulator 4 = Tightness control 5 = Minimum gas pressure switch 6 = Tightness control pressure switch 7 = Multiple solenoid valve 8 = Valve position visual indicator 9 = Closed position indicator switch 10 = Burner pressure gauge 11 = Push button valve A = First valve B = Second valve C = By-pass valve X = Inlet chamber Y = Middle chamber Z = Outlet chamber (the above scheme refers to size 1 "¼-2" with third valve as by-pass) Fig.1 This kind of valve is normally installed as safety and regulating device in gas trains, for industrial applications and gas firing systems. Figure 2 shows an example of installation. Fig.2 3-11  ELEKTROGAS – Technical Sheet EE163 - 01/19 Technical specifications Tab. 1 Connections Gas threaded ISO 7-1 from Rp3/4 to Rp2 or ANSI-ASME B1.20 from 3/4”NPT to 2”NPT Flanged PN16 – ISO 7005 from DN40 to DN80 or ANSI-ASA-ASME B16.5 class 150 from 2” to 3” By-pass size DN15 or DN25 Voltage rating 230 VAC 50/60 Hz 120 VAC 50/60 Hz 110 VAC 50/60 Hz 24 VAC/DC Voltage tolerance -15% / +10% Power consumption 70W for 3/4” – 1” 90W (working) for 1”¼ -3” by-pass 1/2" 25W by-pass 1" 35W Ambient temperature -15°C / +60°C (+5°F to +140°F) Media temperature Max. operating pressure 200 mbar (3 psig) 500 mbar (5 psig) Body test pressure 1 bar (15 psig) Flow capacity see charts Closing time < 1 second Opening time Adjustable Pressure ports G1/4 (add. G1/8 onto flanged models) Gas strainer 600 µm (0.02 in), metal mesh Enclosure IP54 (NEMA 3) optional IP65 with cable (NEMA 4) Cable gland M20x1,5 for terminal box PG 9 for ISO plug Wires cross-section 2,5 mm2 max. (AWG 12) for terminal board 1,5 mm2 max. (AWG 14) for ISO plug Electrical safety Class I (EN 60335-1) Coil winding insulation Class H (200°C, 392°F) Coil thermal resistance Class F (155°C, 311°F) 4-11  ELEKTROGAS – Technical Sheet EE163 - 01/19 Fig.3 Tab. 2 Overall dimensions (mm/in) Weight Model A B C D E F G H I (Kg/lbs) VMM….F00 154/6,06 185/7,28 78/3,07 130/5,12 165/6,50 112/4,41 - - 5,4/11,9 Rp3/4 VMM….S00 3/4”NPT 154/6,06 185/7,28 78/3,07 186/7,32 221/8,70 112/4,41 - - 5,8/12,8 VMM….S10 Rp1 154/6,06 185/7,28 78/3,07 186/7,32 221/8,70 194/7,64 - - 7,1/15,7 1”NPT VMM….S20 154/6,06 185/7,28 78/3,07 186/7,32 221/8,70 194/7,64 - - 7,5/16,5 VMM….F00 211/8,31 280/11,02 127/5,00 170/6,69 230/9,05 148/5,82 - - 13,0/28,7 VMM….S00 Rp1¼ 211/8,31 280/11,02 127/5,00 245/9,64 305/12,00 148/5,82 - - 13,7/30,2 1”¼NPT VMM….S10 Rp1½ 211/8,31 280/11,02 127/5,00 245/9,64 305/12,00 200/7,87 - - 15,3/33,7 VMM….S20 1”½NPT 211/8,31 280/11,02 127/5,00 245/9,64 305/12,00 200/7,87 - - 15,5/34,2 Rp2 VMM….S30 2”NPT 211/8,31 280/11,02 127/5,00 245/9,64 305/12,00 220/8,66 - - 16,3/35,9 VMM….S40…