Controlling a linear servo valve

Discussion in 'General Electronics Chat' started by navidelec, Jan 8, 2015.

  1. navidelec

    Thread Starter New Member

    Jul 12, 2014
    29
    0
    Dear friends
    I want to know why parker control servo valve use's this type of controlling instead of a PWM signal to control the servo valve?
    I wonder if you tell me what is the name of this type of controlling a servo valve?
     
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    Last edited: Jan 10, 2015
  2. ericgibbs

    Senior Member

    Jan 29, 2010
    2,499
    380
    Its a Linear Analogue Closed Loop system, commonly used 20 years ago.
     
  3. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    because a pwm controlled valve is not very practical. the usual valve systems use the 4 to 20 ma dc control put out by most brands of controllers.
     
    navidelec likes this.
  4. navidelec

    Thread Starter New Member

    Jul 12, 2014
    29
    0
    why it isn't practical, I wonder if you help me on this?
     
  5. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    pwm controlled valves lack feedback. an analog conrtolled valve uses a feedback pot and comparator to wet the position of the valve. that way, they can have as much torque as needed for the job.
     
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