• Not Answered

Automated Flow Valves

I am having trouble with an automated flow valve responding in DeltaV. The problem is that in DeltaV the valve is showing that it is open but the valve itself is actually close. I'm thinking that it is not an actual valve but an actuator problem. Any suggestions on what to check? Thanks.

3 Replies

  • And does DV Operate show closed when the valve is physically open in the field?

    If this is a fail open valve (increase to close, 4mA Open) then you need a different dynamo than a normal fail close valve (increase to open, 4mA = Close).

    Other potential options exist to resolve the issue, but we need a bit more information. Did this work before or are you commissioning a new valve? Is this a new valve or existing, has someone replaced the valve recently?
  • We need to find the root of the issue.

    As Adrian points out, is it a fail open or close valve. You first need to align the AO block to match the valve.

    Sometimes people misconfigure the output and the PID action and although the loop controls alright, the OUT value is inverted. Two wrongs making a right....

    Once the Control module is correct, the PID OUT should display correctly.

    If the module is correct I. E. Valve is open when out is 100%, then the issue is in the graphic.

    Andre Dicaire

  • In reply to AdrianOffield:

    The problem was the turk cable connection on the actuator. So I replaced the turk cable and the valve starting operating properly. That was the only thing that I hadn't checked. Thanks for the help.