What is the current in millivolt systems...

Discussion in 'General Electronics Chat' started by Externet, Oct 3, 2014.

  1. Externet

    Thread Starter AAC Fanatic!

    Nov 29, 2005
    About furnace gas valves of the millivolt type, that typically work from a ~750 millivolt thermopile source.

    What is the current to maintain the valve open in operation ? Is it a solenoid ? Maaany places mention only the millivolts, and cannot find the working current requierements for the valve.
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    The solenoid that holds the gas valve open has a resistance of only a fraction of an Ohm, so even 750mV can drive a current > 1A through it to create a strong magnetic field.