CV_CONVERT_COEFF

Overview

Converts between different flow coefficient scales (Kv, Cv, Av).

Excel Usage

=CV_CONVERT_COEFF(coeff, old_scale, new_scale)

• coeff (float, required): Flow coefficient value to convert.
• old_scale (str, required): Original scale (e.g., Kv, Cv, Av).
• new_scale (str, required): Target scale (e.g., Kv, Cv, Av).

Returns (float): Converted flow coefficient.

Examples

Example 1: Kv to Cv

Inputs:

coeff	old_scale	new_scale
10	Kv	Cv

Excel formula:

=CV_CONVERT_COEFF(10, "Kv", "Cv")

Expected output:

11.56

Example 2: Cv to Kv

Inputs:

coeff	old_scale	new_scale
11.56	Cv	Kv

Excel formula:

=CV_CONVERT_COEFF(11.56, "Cv", "Kv")

Expected output:

10

Example 3: Kv to Av

Inputs:

coeff	old_scale	new_scale
10	Kv	Av

Excel formula:

=CV_CONVERT_COEFF(10, "Kv", "Av")

Expected output:

0.00027765

Example 4: Same scale

Inputs:

coeff	old_scale	new_scale
50	Cv	Cv

Excel formula:

=CV_CONVERT_COEFF(50, "Cv", "Cv")

Expected output:

50

Python Code

import micropip
await micropip.install(["fluids"])
from fluids.control_valve import convert_flow_coefficient

def cv_convert_coeff(coeff, old_scale, new_scale):
    """
    Converts between different flow coefficient scales (Kv, Cv, Av).

    See: https://fluids.readthedocs.io/fluids.control_valve.html#fluids.control_valve.convert_flow_coefficient

    This example function is provided as-is without any representation of accuracy.

    Args:
        coeff (float): Flow coefficient value to convert.
        old_scale (str): Original scale (e.g., Kv, Cv, Av). Valid options: Kv (metric), Cv (US), Av (SI).
        new_scale (str): Target scale (e.g., Kv, Cv, Av). Valid options: Kv (metric), Cv (US), Av (SI).

    Returns:
        float: Converted flow coefficient.
    """
    if coeff < 0:
        return "Error: Flow coefficient cannot be negative."

    try:
        return float(convert_flow_coefficient(coeff, old_scale, new_scale))
    except Exception as e:
        return f"Error: {str(e)}"

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