Practice

A two-way control valve is being selected for an office air handler's chilled-water coil. At the design flow of $60\,\text{gpm}$ the coil's water-side pressure drop is $12\,\text{ft}$ of water, and the branch piping, fittings and balancing valve add another $4\,\text{ft}$ of water. The valve is to have an authority of $50\%$ at design flow. The required valve flow coefficient $C_v$ is most nearly:

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