Valve sizing

Required Cv for Cylinder Stroke Time Calculator

Translate cylinder bore, rod, stroke, pressure, direction, target time, and allowed pressure drop into required free-air flow and valve Cv. Enter the application values to calculate four decision-ready outputs and review the governing assumptions before selecting equipment.

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Valve sizing

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Engineering visual

Required Cv for Stroke Time calculation path

Upstream pressure drives flow through the valve restriction to downstream pressure. The restriction and pressure drop are shown at the component where they occur.

01Cylinder bore
02Calculate and compare
03Required valve Cv

Required valve Cv

Equivalent required Kv

Required standard flow

Required flow in SCFM

Calculation reference

What this tool checks.

Use the displayed relationship to understand how the entered conditions affect the result. Treat the output as a preliminary selection, then verify actual operating conditions, catalog limits, and safety margin.

Inputs

Cylinder bore
Rod diameter
Stroke length
Target stroke time
Working pressure
Allowed valve pressure drop
Stroke direction

Outputs

Required valve Cv
Equivalent required Kv
Required standard flow
Required flow in SCFM

Engineering guide

Use the result with the right context.

Calculate required cv for stroke time for a pneumatic application and compare the result with supplier data.

Calculation workflow

Enter Cylinder bore, Rod diameter, Stroke length and replace every default with application data.
Run the calculation while keeping pressure, temperature, geometry, and reference states consistent.
Interpret Required valve Cv, Equivalent required Kv, Required standard flow against the supplier datasheet, machine risk, and an appropriate design margin.

Assumptions and limits

Air is treated as an ideal gas and the entered coefficient or geometry must match the supplier's stated reference conditions.
Confirm the entire flow path, including tubing, fittings, manifolds, silencers, and simultaneous valve demand.

How to use the Required Cv for Stroke Time

Start with measured or supplier-confirmed values for Cylinder bore, Rod diameter, Stroke length, Target stroke time. The calculator updates all outputs together, making it easier to see which assumption controls the preliminary selection.

What the result means

Required valve Cv, Equivalent required Kv, Required standard flow, Required flow in SCFM answer different parts of the same engineering question. Use the primary result for selection, the secondary values to audit units and margins, and the visible formula to reproduce the calculation in an RFQ worksheet.

Engineering limits

Air is treated as an ideal gas and the entered coefficient or geometry must match the supplier's stated reference conditions. Confirm the entire flow path, including tubing, fittings, manifolds, silencers, and simultaneous valve demand. Final approval requires the current manufacturer datasheet and validation under installed conditions.

FAQ

Common review questions.

01Tool noteWhat does the Required Cv for Stroke Time calculate?

Translate cylinder bore, rod, stroke, pressure, direction, target time, and allowed pressure drop into required free-air flow and valve Cv. It returns Required valve Cv, Equivalent required Kv, Required standard flow, Required flow in SCFM so the primary answer and its supporting checks stay together.

02Tool noteCan I use the result as a final component selection?

Use it for preliminary engineering and RFQ comparison. Final selection must include supplier ratings, installation losses, transient conditions, applicable standards, machine risk, and validation testing.

03Tool noteWhy can a supplier calculation differ?

Supplier tools may use proprietary test curves, correction factors, rounding, leakage allowances, or reference conditions. Match those conditions and replace the defaults before comparing results.

04Tool noteWhat should I verify after using the Required Cv for Stroke Time?

Check the entered units and reference conditions, then compare the calculated outputs with manufacturer ratings, application safety margins, transient loads, installation losses, and measured machine performance.