Regarding the Akka locator issue
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This post was last edited by LFC20161205 on 2017-3-27 at 15:59. There are two relief valves on site; the positioners used are ARCA models. When the valves are fully open, a buzzing sound can be heard from the positioners, giving the impression that they are constantly in operation (trying to determine the valve position), yet the valves themselves do not move. I’m not sure what could be causing this
It’s probably a mechanical positioner; this is a normal situation. Either there is air leakage in the sealing, or there is a slight inaccuracy in the zero-point range
It’s likely the piezoelectric valve is trying to find its “balance point.” If conditions permit, it should be possible to do a self-check.