Elektrogas Vent valve VMRNA 2-60 threaded D.3/4" 6 bar

VMRNA Automatic vent valve for gas appliances 3/4”- 1”½ delta-elektrogas.com EE169 - 1118  ELEKTROGAS – Technical Sheet EE169 - 1118 VMRNA Contents Description .. 2 Features .. 2 Functioning and application . 3 Technical specifications 4 Gas flow chart .. . . 5 Ordering information . 6 Special versions . 7 Options .. . . 7 Standards and approvals .. . 7 Description The VMRNA type is an automatic vent valve for gas appliances. It is suitable for discharging excess or leakage gas into relief lines. Features VMRNA valve is a reverse acting solenoid valve: when de-energized, the valve is open (N.O. normally open). The valves are made of aluminum alloy with connections from 3/4” or 1”½. Pipe connections meet group 2. Sealings are made of NBR-based rubber certified for use with air gas (EN 549). Suitable for use with air and non-aggressive gases included in the 1st, 2nd and 3rd families (EN 437). Special versions for aggressive gases (e.g. biogas). Qualified for continuous service (100% ED). Provided with G1/4 pressure gauge on two sides in inlet chamber to connect manometers, pressure switches, or other gas equipment. Provided with G1/8 connection to fit an open position indicator switch (see PCS datasheet - This device shall be ordered separately). VMRNA valve can be integrated in Elektrogas VMM valve, resulting in a very compact system (see VMM datasheet for 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. WARNING This control must be installed in compliance with the rules in force. 2-7  ELEKTROGAS – Technical Sheet EE169 - 1118 Functioning and application The VMRNA type valve is a vent valve for relief line. When it is de-energized, the spring pushes on the magnetic core and the disc is open, hence gas can flow to relief line. This device is usually integrated in burning system: when the system is de-energized, upstream safety shut off valves are closed, while vent valve is open, so that fuel gas inside pipe can be discharged in a safe area. In case of leakages of shut off valves, gas goes to relief line in a safe condition. When the system is powered, vent valve closes while the main shut off valves open, hence fuel can flow to burner. Fig. 1 shows a scheme of VMRNA valve. Fig. 1 This kind of valve is usually installed as safety device in gas trains, for industrial applications and gas firing systems. Fig. 2 shows an example of installation, in combination with other Elektrogas devices. Vent valve VMRNA Safe with open discharge position switch area Pressure PCSRA regulator with filter RF Pressure Ball gauge Pressure Valve switch VSG PSG Gas Burning network system Safety Safety Fig. 2 shut off valve shut off valve VMR VML WARNING Location and mode of installation must be in compliance with local rules in force. 3-7  ELEKTROGAS – Technical Sheet EE169 - 1118 Technical specifications Tab. 1 Internal threaded ISO 7-1 Rp3/4 - Rp1½ Connections or ANSI-ASME B1.20 3/4”NPT – 1½”NPT (special ver.) 230 VAC 50/60 Hz 110 VAC 50/60 Hz 24V AC/DC Voltage 500mbar (7psig) 200mbar (3psig) Max. operating pressure or or 6bar (90psig) - only ¾”-1” 2bar (30psig) – only ¾”-1” Voltage tolerance -15% to +10% Power consumption 35W Ambient temperature -15°C / +60°C (+5°F to +140°F) Opening and closing time < 1 second Protection class IP54 (EN 60529) - optional IP65 Terminal box: M20x1,5 - 2,5 mm2 max. Cable gland and wire section or ISO plug (optional): PG9 - 1,5 mm2 max. Materials in contact with gas Aluminum alloy, Brass, Stainless steel, Plated steel, Anaerobic adhesive, Nitrile rubber (NBR), Fluoro elastomer (FPM), Polytetrafluoroethylene (PTFE) Fig. 3 Tab. 2 A B C D Weight Model Connection (mm) (mm) (mm) (mm) (Kg) VMRNA2.. ¾” 83 95 151 174 2,9 VMRNA3.. 1” 83 95 151 174 2,9 VMRNA35.. 1”¼ 115 152 178 211 4,0 VMRNA4.. 1”½ 115 152 178 211 4,0 4-7  ELEKTROGAS – Technical Sheet EE169 - 1118 Gas flow chart Fig. 4 Formula of conversion Tab. 3 from air to other gases Gas type Specific gravity 1.25 ρ k= [Kg/m³] ρGAS VGAS = k ⋅ VAIR 1 - Natural gas 0,80 1,25 2 - LPG 2,08 0,77 3 - Air 1,25 1,00 Standard conditions: 15°C, 1013 mbar, dry When the flow read on the diagram is referred to operating pressure instead of standard conditions, the pressure drop ∆p read on the diagram must be multiplied for the factor: (1+ relative pressure in bar) 5-7  ELEKTROGAS – Technical Sheet EE169 - 1118 Ordering Information Tab. 4 VMRNA 2 -5 - Valve type VMRNA Connections size 2 = ¾” 3 = 1” 35 = 1”¼ 4 = 1”½ M = integrated in VMM 1”¼-3” (*) Supply voltage and operating pressure -5 = 230V AC 500mbar -60 = 230V AC 6bar (only ¾”-1”) -5.B = 110V AC 500mbar -60.B = 110V AC 500mbar (only ¾”-1”) -2.C = 24V AC/DC 200mbar -20.C = 24V AC/DC 2 bar (only ¾”-1”) Special version N = NPT connection and 120V AC voltage J = version for bio gas Example: VMRNA2-5.B : valve 3/4”, 110V AC, 500mbar (*) Pictures below show a VMM valve assembled with an integrated VMRNA element: VENT LINE TO BURNER VMM…