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Gas/air ratio control with Solenoid Valve VAG

Gas/Air Ratio Control with Built-in Solenoid Valve VAG 1T20N/NQAA

Price:
Quantity:
  • 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
  • ¾″ NPT internal thread connection
  • 120 V AC; 50/60 Hz mains voltage
  • With NPT ¼″ Adapter
  • Standard valve seat
  • Check indication by blue LED
  • Setting options from two sides
  • FM and CSA approved; AGA approved; UL listed
  • Part of the valVario series; Size 1

Applications

Click on images for close-up view.

Application for gas/air ratio control with solenoid valve VAG 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.
Application for gas/air ratio control with solenoid valve VAG 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.
Application for gas/air ratio control with solenoid valve VAG 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..VCT. The simple attachment of the pressure switch module makes installation easier.
Application for gas/air ratio control with solenoid valve VAG 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.
Application for gas/air ratio control with solenoid valve VAG 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.

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valVario Size 1
valVario Size 2
valVario Size 3
VAG 1T15N/NQBA
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Connection: ½″ NPT internal thread; Mains voltage: 120 V AC; 50/60 Hz; With NPT ¼″ Adapter; Valve seat: Reduced; valVario size 1
VAG 1T20N/NQAA
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Connection: &frac32;″ NPT internal thread; Mains voltage: 120 V AC; 50/60 Hz; With NPT ¼″ Adapter; Valve seat: Standard; valVario size 1
VAG 1T25N/NQAA
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Connection: 1″ NPT internal thread; Mains voltage: 120 V AC; 50/60 Hz; With NPT ¼″ Adapter; Valve seat: Standard; valVario size 1
VAG 2T40N/NQAA
Price:
Connection: 1½″ NPT internal thread; Mains voltage: 120 V AC; 50/60 Hz; With NPT ¼″ Adapter; Valve seat: Standard; valVario size 2
VAG 3T50N/NQAA
Price:
Connection: 2″ NPT internal thread; Mains voltage: 120 V AC; 50/60 Hz; With NPT ¼″ Adapter; Valve seat: Standard; valVario size 3
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