Gas/Air Ratio Control with Built-in Solenoid Valve VAG

The pressure regulator VAD, air/gas ratio control VAG, and variable air/gas ratio control VAV use servo technology to shut off and precisely control the gas supply to gas burners and gas appliances. They are for use in gas control and safety systems in all sectors of the iron, steel, glass, and ceramics industries, also in domestic or commercial heat generation, such as the packaging, paper, and food industries.

The VAG air/gas ratio control, Class A, maintains a constant air/gas pressure ratio for modulating-controlled burners or with VAS 1 bypass valve for stage-controlled burners. Pressure is preset by the air control line. The VAG..N can also be used as a zero governor for gas engines.

Features

• All-purpose servo regulator for gaseous media with integrated safety valve
• Suitable for a max. inlet pressure of 500 mbar (500 hPa/7 psig)
• Minimum installation effort: no external impulse line required
• Check indication by blue LED
• Setting options from two sides
• EC type-tested and certified
• FM and CSA approved
• AGA approved
• Part of the Valvario series
• UL listed

	Documentation Manufacturer's Product Brochure Manufacturer's Operating Instructions Manufacturer's Technical Sheet
	Ordering Information Model Connection Mains Voltage NPT ¼adapter Valve Seat Price (US List) Order Now VAG 1T15N/NQBA ½" NPT internal thread 120 V AC; 50/60 Hz Yes reduced $336 VAG 1T20N/NQAA ¾" NPT internal thread 120 V AC; 50/60 Hz Yes standard $354 VAG 1T25N/NQAA 1" NPT internal thread 120 V AC; 50/60 Hz Yes standard $359 VAG 2T40N/NQAA 1½" NPT internal thread 120 V AC; 50/60 Hz Yes standard $502 VAG 3T50N/NQAA 2" NPT internal thread 120 V AC; 50/60 Hz Yes standard $677 For all other configurations Contact Combustion 911
	Applications Click on images for close-up view. Modulating control The gas outlet pressure pG is controlled via the air/gas ratio control with gas solenoid valve VAG. The gas outlet pressure pG follows the changing air control pressure pL. The ratio of gas pressure to air pressure remains constant. The VAG is suitable for a control range up to 10:1. If a second solenoid valve is used upstream of the VAG, this complies with the requirements of EN 746-2 for two Class A valves connected in series. Modulating control with two gas solenoid valves The gas outlet pressure pG is controlled via the air/gas ratio control with gas solenoid valve VAG. The gas outlet pressure pG follows the changing air control pressure pL. The ratio of gas pressure to air pressure remains constant. The VAG is suitable for a control range up to 10:1. The gas line is two Class A shut-off valves connected in series, in accordance with the requirements of EN 746-2. Modulating control with two gas solenoid valves and inlet pressure switch In this case, the minimum inlet pressure pe is monitored by the pressure switch DG..C. The simple attachment of the pressure switch module makes installation easier. High/Low control At high fire, the gas outlet pressure pG follows the air control pressure pL. The ratio of gas pressure to air pressure remains constant. Low fire is determined via the bypass valve. Here as well, the simple attachment of the bypass valve module makes installation easier. Zero pressure control In this application, the control air pressure is the atmospheric air pressure. The air flow rate generates a negative pressure in the gas pipe via the Venturi. This negative pressure is compensated by the air/gas ratio control with gas solenoid valve VAG..N. The greater the negative pressure, the greater the gas flow rate.
	Specifications General Types of Gas: natural gas, town gas, LPG (gaseous), biologically produced methane (max. 0.1 %-by-vol. H2S); other gases on request. The gas must be dry in all temperature conditions and must not contain condensate. Inlet pressure range pe: 10 – 500 mbar (10 – 500 hPa/4 – 200 "WC), FM approved (230 V AC, 120 V AC, 24 V DC), non operational pressure: 700 mbar (700 hPa/10 psig). CSA approved (230 V AC, 120 V AC, 24 V DC) up to 350 mbar (350 hPa/5 psig). Opening time of the solenoid valve: quick opening: ≤ 0.5 s. Closing time: quick closing: < 1 s. Ambient temperature: -20 to +60°C (-4 to +140°F), no condensation permitted. Storage temperature: -20 to +40°C (-4 to 104°F), no condensation permitted. Safety valve: Class A to EN 161, Factory Mutual (FM) Research Class: 410 and 7411 Control range: up to 10:1. Mains voltage: 230 V AC, +10/-15%, 50/60 Hz; 200 V AC, +10/-15%, 50/60 Hz; 120 V AC, +10/-15%, 50/60 Hz; 100 V AC, +10/-15%, 50/60 Hz; 24 V DC, ±20%. Cable gland: M20 x 1.5 Electrical connection: electrical cable with max. 2.5 mm2 (AWG 12) or plug with socket to EN 175301-803. Enclosure: IP 65. Duty cycle: 100%. Power factor of the solenoid coil: cos φ = 1. Power consumption: Type 24 V DC (W) 100 V AC (W) 120 V AC (W) 200 V AC (W) 230 V AC (W) Size 1 29 33 30 33 30 Size 2 46 53 54 54 53 Size 3 46 53 54 54 53 Valve housing: aluminium Valve seal: NBR Connection flanges with internal thread: Rp to ISO 7-1, NPT to ANSI/ASME. Position indicator contact rating: Type Voltage Min. current (resistive load) Max. current (resistive load) VAx..S, VCx..S 12 – 250 V AC, 50/60 Hz 100 mA 3 A VAx..G, VCx..G 12 – 125 V AC, 50/60 Hz 2 mA 0.1 A Position indicator switching frequency: max. 5× per minute Switching current [A] Switching cycles* cos φ = 1 cos φ = 0.6 0.1 500,000 500,000 0.5 300,000 250,000 1 200,000 100,000 3 100,000 -- * Limited to max. 200,000 cycles for heating systems. Outlet pressure pG: 0.5 – 100 mbar (0.5 – 100 hPa/0.2 – 40 "WC). Adjusting range at low fire: ±5 mbar (±5 hPa/±2 "WC). Transmission ratio of gas to air: 1:1 The inlet pressure must always be higher than the air control pressure pL + pressure loss Δp + 5 mbar (5 hPa/2 "WC). Connection of the air control pressure pL: VAG..K: 1 ⅛" coupling for plastic hose (internal dia. 3.9 mm (0.15"), external dia. 6.1 mm (0.24")) or VAG..E: 1 compression fitting for tube 6x1 or VAG..A: 1 NPT ¼adapter or VAG..N: zero governor with breathing orifice.