1. What is Hydraulic Pump Displacement?

Hydraulic pump displacement refers to the volume of fluid a pump can deliver per revolution of the pump shaft. It's a critical parameter in hydraulic system design and performance evaluation, measured in cubic inches per revolution (in³/rev).

2. How Does the Calculator Work?

The calculator uses the hydraulic pump displacement formula:

Where:

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

Explanation: The formula calculates how much fluid volume the pump moves with each complete rotation of its shaft.

3. Importance of Displacement Calculation

Details: Knowing pump displacement is essential for system design, performance prediction, troubleshooting, and selecting the right pump for specific hydraulic applications.

4. Using the Calculator

Tips: Enter the pump's flow rate in GPM and its operating speed in RPM. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between displacement and flow rate?
A: Displacement is volume per revolution, while flow rate is volume per unit time. Flow rate equals displacement times RPM divided by 231.

Q2: How does displacement affect system pressure?
A: Higher displacement pumps can deliver more flow at the same RPM, potentially increasing system pressure if resistance remains constant.

Q3: Can I use this for hydraulic motors?
A: Yes, the same calculation applies to hydraulic motors, where displacement determines torque output.

Q4: What are typical displacement values?
A: Common ranges vary from 0.1 in³/rev for small pumps to over 10 in³/rev for large industrial pumps.

Q5: How accurate is this calculation?
A: This gives theoretical displacement. Actual flow may differ due to efficiency factors, slippage, and system conditions.