What process data is required to size a control valve?
There are many process parameters that should be provided for the sizing of control valves Here just examples of parts of the most important data
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There are many process parameters that should be provided for the sizing of control valves Here just examples of parts of the most important data
Generally the terms rangeability and turndown ratio are associated with control valve sizing and flow measuring devices
Theoretically dropping high pressure across two valves is better than one valve However in practice two valves will not usually control well together unless the
Noise is created by an object vibrating The control valve components will tend to vibrate whenever they are subjected to high velocity turbulent flow <
Inherent characteristics are the flow through the valve or CV relative to the percentage opening the pressure drop at both ends of the valve is
The most common features are shown in the figure above The percentage of flow through the valve corresponds to the stem position These curves are
The inherent flow characteristic of the control valve is the relationship between the flow and travel of the valve to a constant pressure drop across
The Venturi desuperheater adopts restrictive measures in the superheated steam pipeline to form a high speed and turbulent area where cooling water is injected This
In general a vapour phase consists of a phase with two different substances at room temperature whereas a gas phase consists of a single substance
Critical Flow Factor often referred to as Cf is a coefficient that defines how pressure will recover after it drops to its lowest point inside
Cavitation is common so many control valves can withstand a certain amount of time However prolonged exposure to cavitation can severely damage the control valve
Blocking flow is defined as a point at which increasing the pressure drop △P while maintaining a constant inlet pressure P1 will not result in
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