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Title: The Benefits Of Controlled Velocity Regulation
Author: L. W. Smith
Source: 1971 Appalachian Gas Measurement Short Course
Year Published: 1971
Abstract: A benefit is sometimes derived through the absence of something undesirable such as: The absence of regulator control instability. The absence of regulator erosion. The absence of regulator vibration. The absence of regulator noise. The absence of regulator icing and hydrates. These are serious problems which reflect Iheir gravity by the costs involved each year through attempts to exist with them. Regulator control instability can, at times, result from excessive velocity. This may be due to one or a combination of factors. Extremely high velocities will produce turning losses that result in the pressure side loading the stem and plug. This can alter the usually concentric plug-to-seat relationship or flow versus lift variations. If Ibis occurs in a fluctuating manner, then the trim may see vertical instability and/or control performance can suffer. Or even worse, the resultant vibration and wear may lead to destruction of the inner valve.

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