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IP Valve

Discussion in 'Electronic Design' started by Jamie, Aug 17, 2007.

  1. Jamie

    Jamie Guest

    Today I did a last minute upgrade on an oven system to convert from
    an old mercury temperature controller to regulate air to a Steam servo
    valve to a Digital controller with an IP valve.

    I have a problem with the IP valve oscillating when the controller
    wants more than 10 LBs of air to open the servo valve

    Now I noticed if I shut it down to 0 output and then call for
    lets say a 15 LB output, It then some times will get up there smoothly
    with out oscillating..

    One other observation, the unit I pulled out of stock is used where
    some one obviously exchanged the main unit with a used one but leaving
    the new cover.. Is it possible the valve is defective? We don't have
    another in stock at the moment.

    P.S.
    I checked the output signal from the controller, it holds a steady
    20 ma current while it's trying to open the IP valve to max position
    and the incoming is also regulated at the 40 LBs of supply as per
    labeled on the IP valve.

    Is it possible this valve is defective ? since it works fine under 10
    Lbs and appears that it was already in service at one time.
    The rated output is 3..15 Lbs normal., but we have these same valves
    on other equipment where they don't oscillate and even run higher output
    LBS..
     
  2. Tim Wescott

    Tim Wescott Guest

    You should post this over on sci.engr.control -- the group's a lot
    quieter, but that's because the discussion is nearly all on topic. Even
    the acrimony is about control systems, not Republicrat vs. Demoblican.

    --
    Tim Wescott
    Control systems and communications consulting
    http://www.wescottdesign.com

    Need to learn how to apply control theory in your embedded system?
    "Applied Control Theory for Embedded Systems" by Tim Wescott
    Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html
     
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