The calibration of the actuator spring range of a control valve to account for the in-service process forces.
Bench set is initial compression placed on the actuator spring with a spring adjuster. For air-to-open valves, the lower bench set determines the amount of seat load force available and the pressure required to begin valve-opening travel. For air-to-close valves, the lower bench set determines the pressure required to begin valve-closing travel. Seating force is determined by pressure applied minus bench set minus spring compression due to travel. Because of spring tolerances, there might be some variation in the spring angle. The bench set, when the valve is seated, requires the greatest accuracy.
Thsi was already covered in a previous thread pl search
(Also please google before asking, even wiki has a quite detailed information on it)
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instrumentation
Re: instrumentation
