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Answer Posted / sam.r
An undesirable oscillation of appreciable magnitude,
prolonged after external stimuli disappear. hunting is the
evidence of operation at or near the stability limit.
in control valves is caused by the oscillation in the
loading pressure to the actuator caused by the instability
in the control system or the valve positioner .
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Identification of control valve parts.
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Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72
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