K_GLOBE_VALVE

Overview

Calculate the loss coefficient (K) for a globe valve using the Crane method.

Excel Usage

=K_GLOBE_VALVE(D_valve, D_pipe)

• D_valve (float, required): Diameter of the valve seat bore [m]
• D_pipe (float, required): Diameter of the pipe attached to the valve [m]

Returns (float): Loss coefficient K for the globe valve [-]

Examples

Example 1: Reduced port globe valve

Inputs:

D_valve	D_pipe
0.01	0.02

Excel formula:

=K_GLOBE_VALVE(0.01, 0.02)

Expected output:

Result
135.9201

Example 2: Full bore globe valve

Inputs:

D_valve	D_pipe
0.05	0.05

Excel formula:

=K_GLOBE_VALVE(0.05, 0.05)

Expected output:

Result
6.4822

Example 3: Large globe valve

Inputs:

D_valve	D_pipe
0.1	0.15

Excel formula:

=K_GLOBE_VALVE(0.1, 0.15)

Expected output:

Result
26.9385

Example 4: Small globe valve

Inputs:

D_valve	D_pipe
0.025	0.025

Excel formula:

=K_GLOBE_VALVE(0.025, 0.025)

Expected output:

Result
7.69

Python Code

import micropip
await micropip.install(["fluids"])
from fluids.fittings import K_globe_valve_Crane as fluids_k_globe_valve

def k_globe_valve(D_valve, D_pipe):
    """
    Calculate the loss coefficient (K) for a globe valve using the Crane method.

    See: https://fluids.readthedocs.io/fluids.fittings.html#fluids.fittings.K_globe_valve_Crane

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

    Args:
        D_valve (float): Diameter of the valve seat bore [m]
        D_pipe (float): Diameter of the pipe attached to the valve [m]

    Returns:
        float: Loss coefficient K for the globe valve [-]
    """
    try:
        D1 = float(D_valve)
        D2 = float(D_pipe)
    except (ValueError, TypeError):
        return "Error: D_valve and D_pipe must be numbers."

    if D1 <= 0 or D2 <= 0:
        return "Error: Diameters must be positive."
    if D1 > D2:
        return "Error: D_valve must be <= D_pipe."

    try:
        result = fluids_k_globe_valve(D1=D1, D2=D2)
        return float(result)
    except Exception as e:
        return f"Error: {str(e)}"

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