1. What is Hydraulic Pump Displacement?

Hydraulic pump displacement refers to the volume of fluid pumped per revolution of the pump shaft. It's a critical parameter in hydraulic system design, determining the relationship between pump speed and flow output.

2. How Does the Calculator Work?

The calculator uses the hydraulic pump 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 converting the flow rate from GPM to cubic inches per minute and then dividing by the pump speed.

3. Importance of Displacement Calculation

Details: Knowing the displacement is essential for selecting the right pump for an application, determining system flow requirements, and calculating hydraulic motor speeds.

4. Using the Calculator

Tips: Enter the flow rate in GPM and the 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 theoretical and actual displacement?
A: Theoretical displacement is calculated, while actual displacement accounts for pump efficiency and internal leakage.

Q2: How does displacement relate to pump size?
A: Larger displacement pumps move more fluid per revolution and are generally physically larger.

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

Q4: What's a typical displacement range for hydraulic pumps?
A: Common ranges vary from 0.1 in³/rev for small pumps to over 20 in³/rev for large industrial pumps.

Q5: How does displacement affect system pressure?
A: Displacement doesn't directly determine pressure - pressure is created by the resistance to flow in the system.