Explain about Quick opening Control Valve Characteristics


#1

A quick opening valve plug produces a large increase in flow for a small initial change in stem travel.

Near maximum flow is reached at a relatively low percentage of maximum stem lift.

Quick opening plugs are normally utilized in two position “On-Off” applications but may be used in some linear valve applications.

This is possible because of its initial linear characteristic at a low percentage of stem travel.

The slope of this linear region is very steep which produces a higher initial gain than the linear plug but also increases the potential instability of the control valve.

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#2

Below you will find the related plugs of the above mentioned Control Valves:

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