How to Convert Between Cv and Kv

The Flow Converter calculates the equivalent flow coefficient between Cv (Flow Coefficient) and Kv (Flow Factor) using the following conversion formulas:

From Cv to Kv:

From Kv to Cv:

Where:

• \( C_v \): Flow Coefficient, used primarily in Imperial units, represents the flow capacity in gallons per minute (GPM) of water at 60°F with a pressure drop of 1 psi across a valve.
• \( K_v \): Flow Factor, used in metric units, represents the flow capacity in cubic meters per hour (m³/h) of water at 20°C with a pressure drop of 1 bar across a valve.

Using the Flow Converter

This converter is designed to assist engineers and professionals in fields like process engineering, fluid mechanics, and valve sizing to convert between Cv and Kv for control valve design and selection.

Input the flow value, select the unit (Cv or Kv), and click "Convert." The calculator will display the equivalent values in both Cv and Kv, rounded to 6 decimal places for precision.

Example: Convert a Cv value of 10 to Kv.

1. Input Value: \( 10 \, C_v \)
2. Unit: \( C_v \)
3. Conversion: \( K_v = 0.862 \times 10 = 8.620 \, K_v \)
4. Result: \( 10 \, C_v = 8.620 \, K_v \)

Common Conversion Table

The following table provides quick reference conversions for common Cv and Kv values:

Cv	Kv
1	0.862
5	4.310
10	8.620
20	17.240
50	43.100

Use the calculator for precise conversions of any Cv or Kv value.

Common FAQ

Below are frequently asked questions about Cv and Kv conversions:

• Q: What is the difference between Cv and Kv?
  A: Cv is the Flow Coefficient used in Imperial units, measuring water flow in GPM at 60°F with a 1 psi pressure drop. Kv is the Flow Factor used in metric units, measuring water flow in m³/h at 20°C with a 1 bar pressure drop.
• Q: Why is this conversion necessary?
  A: Different regions and industries use either Cv or Kv for valve sizing. This converter ensures compatibility across Imperial and metric systems.
• Q: How accurate is this converter?
  A: The converter uses precise conversion factors (1.16 and 0.862) and provides results rounded to 6 decimal places for high accuracy.
• Q: Can negative values be converted?
  A: No, negative values are not physically meaningful for flow coefficients, and the calculator restricts inputs to non-negative values.
• Q: Where is this converter used?
  A: It’s used in process engineering, HVAC, and valve manufacturing to select appropriately sized control valves for fluid and gas systems.