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Cushion restriction

Cylinder Cushion Needle and Orifice Flow Calculator

Estimate compressible air flow through a cushion needle or equivalent orifice using diameter, pressure ratio, temperature, and discharge coefficient. Enter the application values to calculate four decision-ready outputs and review the governing assumptions before selecting equipment.

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Cushion restriction

Run the calculation

Estimate compressible air flow through a cushion needle or equivalent orifice using diameter, pressure ratio, temperature, and discharge coefficient. Enter the application values to calculate four decision-ready outputs and review the governing assumptions before selecting equipment.

Engineering inputsCushion Orifice Flow Calculator

Enter the known application values. Outputs update instantly as units or assumptions change.

Use these values for preliminary sizing before final datasheet review.

Engineering visual

Cushion Orifice Flow Calculator 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.

Cushion Orifice Flow Calculator calculation pathUpstream pressure drives flow through the valve restriction to downstream pressure. The restriction and pressure drop are shown at the component where they occur.UPSTREAM p₁DOWNSTREAM p₂VALVE / ORIFICEFLOW QΔp = p₁ − p₂
  1. 01Equivalent orifice diameter
  2. 02Calculate and compare
  3. 03Estimated standard flow
Estimated standard flow
Estimated flow in SCFM
Equivalent orifice area
Absolute downstream/upstream ratio

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

  • Equivalent orifice diameter
  • Upstream gauge pressure
  • Downstream gauge pressure
  • Air temperature
  • Discharge coefficient

Outputs

  • Estimated standard flow
  • Estimated flow in SCFM
  • Equivalent orifice area
  • Absolute downstream/upstream ratio

Engineering guide

Use the result with the right context.

Calculate cushion orifice flow calculator for a pneumatic application and compare the result with supplier data.

Calculation workflow

  1. Enter Equivalent orifice diameter, Upstream gauge pressure, Downstream gauge pressure and replace every default with application data.

  2. Run the calculation while keeping pressure, temperature, geometry, and reference states consistent.

  3. Interpret Estimated standard flow, Estimated flow in SCFM, Equivalent orifice area 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.

FAQ

Common review questions.

01Tool noteWhat does the Cushion Orifice Flow Calculator calculate?

Estimate compressible air flow through a cushion needle or equivalent orifice using diameter, pressure ratio, temperature, and discharge coefficient. It returns Estimated standard flow, Estimated flow in SCFM, Equivalent orifice area, Absolute downstream/upstream ratio 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 Cushion Orifice Flow Calculator?

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.