Flow and Pressure
Fluid Flow and Pressure Drop Datasheet Comparison
How to compare valves, regulators, pumps, hoses, fittings, filters, and fluid components when flow, pressure, and fluid assumptions differ.
Why this comparison matters
The source context determines whether values can be compared.
A higher flow rating is not useful if it was measured at a higher pressure drop.
Gas-flow units and liquid-flow units should remain separate unless the basis is defined.
Leak rate, burst pressure, proof pressure, and working pressure describe different requirements.
Common datasheet labels
Labels and aliases to preserve before mapping.
Unit normalization
Normalize only when the unit family and condition are compatible.
| Property | Source formats | Canonical format | Review note |
|---|---|---|---|
| Liquid flow | GPM, L/min, mL/min | L/min | Comparable only at similar pressure drop and fluid condition. |
| Gas flow | sccm, slm, CFM | sccm or CFM | Keep standard conditions and gas type attached. |
| Pressure | psi, bar, kPa, MPa | MPa | Keep working, proof, burst, and differential pressure separate. |
Worked comparison example
Originals first. Normalized values second. Review last.
| Spec | Sheet A Original | Sheet B Original | Sheet A Normalized | Sheet B Normalized | Review |
|---|---|---|---|---|---|
| Cooling flow | 0.66 GPM | 2.5 L/min | 2.50 L/min | 2.5 L/min | Equivalent after conversion |
| Leak rate | 5 sccm air max | 3 mL/min water max | 5 sccm air max | Needs review | Different fluid basis |
Review warnings
Values that should not be accepted automatically.
Do not normalize gas and liquid flow as equivalent without source context.
Do not compare pump curves at different operating points.
Leak rate comparisons must preserve fluid, pressure, temperature, and test method.
How SpecCore handles this
Formula-first comparison output for engineering review.
SpecCore separates flow, pressure, leak, and curve-based fields while preserving units and conditions that determine comparability.
Related guides
Dimensional Analysis for Datasheet Unit Conversion
Dimensional analysis keeps conversions traceable when suppliers publish the same requirement in different units.
Tolerance Stackup and Datasheet Comparison
Tolerance values are not interchangeable unless the nominal, limit type, datum, and measurement condition are preserved.