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What is the difference between installed and inherent characteristics?

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 constant) of the graph. This is the result of a workshop test in which the upstream and downstream pressures are constant and the only variables are the flow and opening of the valve.

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 constant) of the graph. This is the result of a workshop test in which the upstream and downstream pressures are constant and the only variables are the flow and opening of the valve.

The feature of the installation is a flow-opening diagram using the actual pressure drop encountered in practice. Since the pressure drop increases with the flow rate in most applications, the installation feature typically changes from EQ% to linear, and from linear to quickly turned on.

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