1. What is Hydraulic Pump Displacement?

Hydraulic pump displacement refers to the volume of fluid that a pump can deliver per revolution. It's a critical parameter in hydraulic system design, determining the pump's flow output at a given speed.

2. How Does the Calculator Work?

The calculator uses the displacement formula:

Where:

• \( Q \) — Flow rate in gallons per minute (GPM)
• \( RPM \) — Pump speed in revolutions per minute
• \( 231 \) — Conversion factor (cubic inches per gallon)

Explanation: The formula calculates the volume of fluid displaced per revolution by relating flow rate to pump speed, with conversion from gallons to cubic inches.

3. Importance of Displacement Calculation

Details: Knowing pump displacement is essential for system design, performance prediction, troubleshooting, and selecting the right pump for an application.

4. Using the Calculator

Tips: Enter flow rate in GPM and pump speed in RPM. Both values must be positive numbers. The result will be in cubic inches per revolution (in³/rev).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between fixed and variable displacement pumps?
A: Fixed displacement pumps move the same amount of fluid per revolution, while variable displacement pumps can adjust their displacement.

Q2: How does displacement relate to pump torque?
A: Pump torque is directly proportional to displacement - higher displacement means higher torque requirements at the same pressure.

Q3: What are typical displacement values for hydraulic pumps?
A: Displacement varies widely from less than 0.1 in³/rev for small pumps to over 10 in³/rev for large industrial pumps.

Q4: Can I calculate flow rate if I know displacement and RPM?
A: Yes, rearrange the formula: \( Q = \frac{Displacement \times RPM}{231} \)

Q5: Why is 231 used in the formula?
A: 231 is the number of cubic inches in a US gallon, used to convert between GPM and in³/rev.