{"id":1064,"date":"2026-10-02T03:06:25","date_gmt":"2026-10-02T03:06:25","guid":{"rendered":"https:\/\/zqhydrauliccylinder.com\/?p=1064"},"modified":"2026-10-02T03:06:25","modified_gmt":"2026-10-02T03:06:25","slug":"how-to-calculate-hydraulic-cylinder-speed-from-flow-and-area","status":"publish","type":"post","link":"https:\/\/zqhydrauliccylinder.com\/fr\/how-to-calculate-hydraulic-cylinder-speed-from-flow-and-area\/","title":{"rendered":"How to Calculate Hydraulic Cylinder Speed From Flow and Area"},"content":{"rendered":"

Hydraulic cylinder speed is calculated by dividing volumetric flow by the active piston area. Extension normally uses the full bore area; retraction uses the annular area after subtracting the rod area. This gives theoretical speed. Actual motion also depends on leakage, valve and line losses, load behavior, oil temperature, acceleration and end-of-stroke control.<\/p>\n\n\n\n

This guide supports industrial engineering and procurement. Follow the machine manufacturer’s instructions and qualified safety procedures. Explore Hydraulique Zhenqiang<\/a>.<\/p>\n\n\n\n

Calculate the active area<\/h2>\n\n\n\n

Extension area is A = \u03c0D\u00b2\/4, where D is bore diameter. Retraction area for a conventional single-rod cylinder is A = \u03c0(D\u00b2 \u2212 d\u00b2)\/4, where d is rod diameter.<\/p>\n\n\n\n

Because retraction area is smaller, retraction is normally faster than extension at equal incoming flow. Keep all dimensions in one unit system before calculating area.<\/p>\n\n\n\n

Convert flow into linear speed<\/h2>\n\n\n\n

The core relationship is v = Q\/A. With flow Q in cubic metres per second and area A in square metres, velocity v is metres per second.<\/p>\n\n\n\n

For practical calculations, convert litres per minute to cubic metres per second before dividing. Calculate extension and retraction separately and state assumed pump flow at the cylinder, not only nominal pump displacement.<\/p>\n\n\n\n

Explain why measured speed differs<\/h2>\n\n\n\n

Valve metering, pressure compensation, hose size, fittings, return back pressure and internal leakage change available flow. Pump flow may fall or increase with engine speed and circuit demand.<\/p>\n\n\n\n

Load-induced motion can exceed commanded speed unless a suitable load-control strategy is used. Never assume that a flow-control valve alone makes an overrunning load safe.<\/p>\n\n\n\n

Validate the selected speed<\/h2>\n\n\n\n

Check seal velocity, bearing lubrication, pressure loss, heat generation, rod stability, cavitation risk and machine stopping distance. Review cushions or external deceleration where the cylinder approaches a hard stop.<\/p>\n\n\n\n

Commission at controlled speed and record actual stroke time, pressure, temperature and load. Unexpected differences indicate a circuit or mechanical issue that needs diagnosis.<\/p>\n\n\n\n

Practical reference<\/h2>\n\n\n\n
Input<\/th>Role<\/th><\/tr><\/thead>
Diam\u00e8tre d'al\u00e9sage<\/td>Defines extension area<\/td><\/tr>
Diam\u00e8tre de la tige<\/td>Reduces retraction area<\/td><\/tr>
Cylinder flow<\/td>Determines theoretical velocity<\/td><\/tr>
Accident vasculaire c\u00e9r\u00e9bral<\/td>Converts velocity into cycle time<\/td><\/tr>
Load and circuit losses<\/td>Explain real-world deviation<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Information to document<\/h2>\n\n\n\n