Answer Posted / robert

Esd valves are required by gov. safety standards to be
checked periodically to be able to stroke i.e. (move to a
determined position, usually 90 % and back to original
position.) If the valve does as required, it passes
function test and can remain in service. In some
applications valves tend to stay in one position for long
periods of time. This often has an effect on the
bearings "freezing" up, and in an emergency situation the
valve may not close when required.

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