Electrogas Control Valve Model VF VFH

Detail Elektrogas Control Valves VF VFH
VF VFH
Butterfly valves for air and gas
VF and VFH butterfly valves are designed for regulation and control of air and gas flow.

Valves can be operated manually using a lever (to setup the high-fire rate of the burner) or automatically using a servomotor (modulating or staged control) or a solenoid actuator (two-stage control).
The setting can be monitored on a graduated scale, this allows  precise regulation ratios.
This type of device is suitable for air and gas adjustment in combustion processes, like industrial kilns, drying stoves, smelting and annealing furnaces.
Material/Connections
1.       VF
-          (AlSi) : DN40 … DN150
2.       VFH
-          (GGG) : DN40 … DN200
Operating pressure
1.       VF : 0 … 500 mbar
2.       VFH : 0 … 150 mbar
Media temperature
1.       VF : 60°C (200°C optional)
2.       VFH : 450°C
Approvals
1.       VF  : EC-type tested and certified according to EN13611
Gas Type
1.       VF : air and non-aggressive gases (Family 1-2-3, EN 437)
2.       VFH : heated air and flue gas

Electrogas Valves VRA VLA VTA

Detail Elektrogas Control Valves VRA VLA VTA
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
1.       AlSi : Rp3/4 … Rp2½
2.       AlSi : DN40 … DN80
Operating pressure
1.       0 … 200 mbar
Media temperature
1.       Cold air 60°C max.
Settings
1.       High/Low stage operation
2.       VRA: 1s opening/closing
3.       VLA: ~4s opening/1s closing
4.       VTA: ~4s opening/closing
5.       Bypass bore (optional)

Electrogas Control Valves SR LT ST

Detail Elektrogas Control Valves SR SL ST
SR SL ST
Solenoid actuator for butterfly valves

Solenoid actuators are designed to operate VF and VFH butterfly valves.When the coil is not energized the inner spring pushes down the plunger and, by means of a gear mating, shifts the connected valve to the minimum opening position.

When the coil is powered the plunger moves up fast (SR) or slowly (SL-ST), shifting the valve to the maximum opening position. This type of device, connected to VF and VFH butterfly valves, is used in two-stage control of gas and air flow in combustion processes.

Adjustments
1. two regulating screws for minimum and maximum flow rate adjustment
Operating time (0 - 90°)
1.       SR: 1s opening/closing
2.       SL: ~4s opening / 1s closing
3.       ST: ~4s opening/closing
Voltage rating
1.       230VAC 50/60Hz
2.       110VAC 50/60Hz

Approvals
1.       Comply with 2004/108/EC and 2006/95/EC directives

Elektrogas Control Valves MZ

Detail Elektrogas Control Valves MZ
MZ Servomotor for butterfly valves

Servomotors MZ are designed to operate VF and VFH butterfly valves. They consist of a multi-stage spur gearbox with DC motor, driven by an electronic control unit. This allows a high torque and adjustable running time. MZ3 type is suitable for basic adjusting position, operated by cams connected to driving shaft.

MZ5 type is suitable for advanced adjusting position, controlled by analogue signals with very high positioning precision. This type of device, connected to VF and VFH butterfly valves, is suitable for three-stage control (MZ3) or electronic positioning control (MZ5), of gas and air flow in combustion processes. Available in ATEX ex-proof version and in 10Nm torque version (MZ510).

Position control
1.       MZ3: switching cams
2.       MZ5: In/Out analogue signals 0-10V, 0(4) -20mA
Operating time (0 - 90°)
1.       7s, 15s, 30s, 60s
2.       7..60s programmable (MZ5)

Voltage rating
1.       230VAC 50/60Hz
2.       110VAC 50/60Hz
3.       24V AC/DC

Approvals
1.       Comply with 2004/108/EC and 2006/95/EC directives