1. What is Flow Differential Pressure?

The flow differential pressure (ΔP) is the pressure drop across a valve or other restriction in a flow system. It's calculated using the flow rate (Q) and the flow coefficient (K_v) of the component.

2. How Does the Calculator Work?

The calculator uses the flow differential pressure equation:

Where:

• \( \Delta P \) — Differential pressure (bar)
• \( Q \) — Flow rate (m³/h)
• \( K_v \) — Flow coefficient (dimensionless)

Explanation: The equation shows that pressure drop increases with the square of the flow rate and decreases with the square of the flow coefficient.

3. Importance of ΔP Calculation

Details: Calculating differential pressure is essential for system design, valve selection, and ensuring proper flow characteristics in piping systems.

4. Using the Calculator

Tips: Enter flow rate in m³/h and flow coefficient (K_v). Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the flow coefficient K_v?
A: K_v is defined as the flow rate in m³/h of water at 15-30°C that causes a pressure drop of 1 bar across the valve.

Q2: What are typical K_v values?
A: K_v values vary by valve size and type, ranging from less than 1 for small valves to over 1000 for large valves.

Q3: Can this be used for gases?
A: This simple equation is primarily for liquids. Gas flow calculations require additional factors for compressibility.

Q4: What affects ΔP besides flow rate?
A: Pipe diameter, length, roughness, fittings, and fluid properties (viscosity, density) all influence pressure drop.

Q5: How accurate is this calculation?
A: It provides a basic estimate. For precise calculations, consider complete system characteristics and fluid properties.