Delta P is another name for______.

Delta P is another name for______.

• A. Flow rate
• B. The flow direction arrow on a valve symbol
• C. Pressure differential
• D. Valve

Answer: (C)

Delta P means the pressure differential—the difference between two pressures in a fluid system, such as the pressure upstream and downstream of a valve or across a restriction. This pressure difference is what drives flow through many components; the larger the ΔP, the more fluid tends to flow, assuming other factors stay the same. It’s also often called the pressure drop. This term isn’t about how much fluid is moving (that’s flow rate), nor is it about the direction indicated on a valve symbol, and it isn’t a valve itself. Those others refer to different ideas: flow rate is a quantity of fluid per time, the arrow shows direction, and a valve is a device that can influence ΔP but isn’t the meaning of the term itself.

Delta P means the pressure differential—the difference between two pressures in a fluid system, such as the pressure upstream and downstream of a valve or across a restriction. This pressure difference is what drives flow through many components; the larger the ΔP, the more fluid tends to flow, assuming other factors stay the same. It’s also often called the pressure drop.

This term isn’t about how much fluid is moving (that’s flow rate), nor is it about the direction indicated on a valve symbol, and it isn’t a valve itself. Those others refer to different ideas: flow rate is a quantity of fluid per time, the arrow shows direction, and a valve is a device that can influence ΔP but isn’t the meaning of the term itself.