1. What is a Hydraulic Cylinder Flow Rate Calculator?

Definition: This calculator determines the required flow rate (in gallons per minute) for a hydraulic cylinder based on its area and stroke speed.

Purpose: It helps hydraulic system designers and maintenance technicians properly size pumps and select components for hydraulic systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (gallons per minute, GPM)
• \( A_c \) — Cylinder area (square inches)
• \( S_c \) — Stroke speed (inches per second)
• 60 — Conversion from seconds to minutes
• 231 — Cubic inches per gallon (conversion factor)

Explanation: The formula calculates the volume of fluid needed per minute to achieve the desired cylinder speed.

3. Importance of Flow Rate Calculation

Details: Proper flow rate calculation ensures hydraulic systems operate efficiently, with adequate power and without excessive heat generation.

4. Using the Calculator

Tips: Enter the cylinder's effective area (bore area minus rod area for retract calculations) and desired stroke speed. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find the cylinder area?
A: For extension, use \( \pi \times (Bore\ Diameter/2)^2 \). For retraction, subtract rod area from this value.

Q2: What's a typical stroke speed?
A: Industrial cylinders typically operate at 2-12 in/s, while high-speed applications may reach 20-40 in/s.

Q3: Why is the result in GPM?
A: Gallons per minute is the standard unit for hydraulic pump flow rates in the US.

Q4: Does this account for system efficiency?
A: No, consider adding 10-20% to the calculated flow to account for pump efficiency and system losses.

Q5: How does this relate to cylinder force?
A: Flow rate determines speed, while pressure determines force. They are separate but related hydraulic parameters.