Plumbing Valve Pressure Drop From Cv Calculator
Liquid valve ΔPpsi=SG(QUSgpm/Cv)², independently verified incompressible noncavitatingCvbranch, not gason/off critical flow. Actual independently matched units, regime, material/equipment and governing references; not a hydraulic code, safe pressure, water pot ability or operational approval.
Description
Liquid valve Cv relates flow and pressure drop under its applicable flow branch.
Liquid valve Cv relates flow and pressure drop under its applicable flow branch.1
Specific gravity and US-gallon-per-minute units are part of the convention. The calculation and input requirements are explained below.
When to use Plumbing Valve Pressure Drop From Cv Calculator
Enter positive liquid specific gravity and applicable valve Cv, plus nonnegative flow in US gpm.
How to use Plumbing Valve Pressure Drop From Cv Calculator and how it works
- Prepare the measurements or independently established model inputs described below, with matching units and observation scope.
- Enter the required fields and run Plumbing Valve Pressure Drop From Cv Calculator.
- Read the result fields using the formula, output units, signs and ordering explained below.
- Correct any rejected inputs and rerun; interpret the result within the stated model and its assumptions.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| callerActualLiquidSpecificGravity | Caller Actual Liquid Specific Gravity. Use the units and matching context stated in the calculation below. | number | Required; strictly positive; finite; other constraints below |
| actualLiquidFlowUsGallonsPerMinute | Actual Liquid Flow Us Gallons Per Minute. Use the units and matching context stated in the calculation below. | number | Required; nonnegative; finite; other constraints below |
| callerVerifiedValveCv | Caller Verified Valve Cv. Use the units and matching context stated in the calculation below. | number | Required; strictly positive; finite; other constraints below |
Enter positive liquid specific gravity and applicable valve Cv, plus nonnegative flow in US gpm. Return SG times squared flow/Cv in psi under the incompressible noncavitating branch. Gas and critical-flow behavior are not modeled.
pressureDropPsi=SG*(Q_USgpm/Cv)^2 Apply the input ordering, units and branch conditions stated above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Object containing the calculated or selected fields below. | object |
| result.value | Numeric result under the formula and output units explained above. | number |
{
"input": {
"callerActualLiquidSpecificGravity": 1,
"actualLiquidFlowUsGallonsPerMinute": 2,
"callerVerifiedValveCv": 1
},
"output": {
"result": {
"value": 4
}
}
}Limitations and assumptions
The calculation uses the supplied observations and model inputs. It does not collect measurements, select a reference population or coefficient, or establish that the model applies to the actual case. The stated branch conditions and output units remain part of the result.
All fields require explicit values. Unexpected fields, wrong types, nonfinite numbers and sparse arrays are rejected. Alignment, bounds and supported-token rules are explained above; extremely large inputs or nonfinite results can also fail. Input errors differ from successful false comparisons, unavailable-domain flags and empty match lists.
Alternative or Complementary methods
Use Plumbing Relative Roughness Calculator for a complementary operation: Relative roughness compares a pipe's absolute roughness with its internal diameter.
Use Plumbing Darcy Weisbach Head Loss Calculator for a complementary operation: Darcy–Weisbach head loss combines pipe length, bore, mean velocity and Darcy friction factor.
References
Similar or alternative tools
- Plumbing Relative Roughness Calculator
Relative roughness compares a pipe's absolute roughness with its internal diameter.
- Plumbing Darcy Weisbach Head Loss Calculator
Darcy–Weisbach head loss combines pipe length, bore, mean velocity and Darcy friction factor.