VRA VLA VTA
Solenoid valves for combustion air regulation
The VRA/VLA/VTA types are normally closed solenoid valves for cold
combustion air regulation. When the coil is not energized the spring works on
the disc, keeping the adjusted minimum passage of air. When powering the coil
the valve opens, moving the disc to the maximum open position. When power is
switched off the valve moves to the minimum position.
This type of device is suitable for high/low stage control of combustion
air in industrial gas burners. (qualified for continuous service- 100% ED).
Material/Connections
|
AlSi
|
Rp3/4 …
Rp2½
|
|
AlSi
|
DN40 … DN80
|
Operating pressure
|
0 … 200
mbar
|
Media temperature
|
Cold air
60°C max.
|
Settings
|
High/Low
stage operation
|
|
VRA: 1s
opening/closing
|
|
VLA: ~4s opening/1s
closing
|
|
VTA: ~4s
opening/closing
|
|
Bypass bore
(optional)
|
