[Stoves] VALVE for gasifier

[Frans Peeters]

    Dear Tom ,Steve and all,
You ask for a motor controlled valve .
The mechanical part can be : A box 50x120x3 mm with a sliding plate
48x50 x1 mm inside .
The box has two holes opposite each to  other 45x45 mm ,with inlet
outlet tubes 50 mm long .
The sliding plate has a 3mm 80 mm actuator arm to the DC motor 5 watt .
Fixation : Motor as is 70 mm long screw . Valve is arm has a nut .
Motor positioning : like a servo controlled chart recorder , The valve
position path has a mechanical connected potentiometer connected in
bridge with a potentiometer of the sensing set value and input from  a
sensor .. 
     The Oxygen sensors output  goes to the servo amplifier . This + or
– DC output power 5V 1A drives the motor till feed back is zero .
You find nice material in old PC ‘s HDD drives CD rom drives . Chart
recorders . Window screen positioners .Ventilation servo control ed
ducts motors .   Model toys .
      Other principle :Fast actuators , magnetic actuator . Flat coil
electromagnet in a strong samarium magnet is moved by DC power 5V 1 A ..
Like a  strong moving coil meter ,with force arm ..  See old  HDD drives
.and balances ,also  pressure regulators .
      . Mind new linear motor cost 200 $  Scrap cost  1 $ .
Good luck !
 
Frans

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