Source-controlled comparison

Valve Closure Test Record Comparator

Compare a recorded observation with an acceptance criterion copied from the governing licensed standard, valve product standard or purchaser specification. This page does not generate a normative leakage class, pressure, duration or test procedure.

No embedded standards tableNo automatic class mappingNo generated test pressureExplicit comparison only

Record comparison

Do not begin a pressure test from this page. Pressure testing can be hazardous and ISO 5208 explicitly does not cover its safety aspects. An approved procedure, competent personnel, suitable equipment, exclusion controls and the applicable product/purchaser requirements must already exist.

Governing requirement

Requirement source

Edition / revision / clause or table record

Valve and test record ID

Acceptance criterion type

Criterion and observation

Procedure record – copied, not calculated

Test medium and condition

Applied test pressure and pressure basis

Actual test duration

Measurement/observation method and resolution

I copied the criterion from the applicable licensed edition and checked the valve product standard and purchaser specification; I did not infer equivalence between ISO, API and EN classes. I confirmed the valve type, seat/closure arrangement, test medium, pressure basis, duration, direction and measurement method match the governing requirement. I understand this comparison does not approve the test procedure, establish pressure-test safety or issue final conformity/acceptance.

Comparison logic

For a quantitative criterion, both values must already be in the same recorded unit. No drops-to-volume, bubbles-to-volume, gas-to-liquid or standard-to-standard conversion is performed.

Entered record	Sammenligning	Displayed status
Measured leakage <= copied positive maximum	Measured / maximum; margin = maximum – measured	Within entered numerical limit
Measured leakage > copied positive maximum	Same full-precision comparison	Above entered numerical limit
No visually detectable leakage criterion	Compare only the recorded visual observation	Observation matches / does not match entered criterion

A recorded numerical zero is not the same as “no visually detectable leakage.” Zero can mean “below the instrument resolution,” while the qualitative criterion depends on the specified observation method and test duration. The two paths remain separate.

Numerical comparison uses finite IEEE 754 binary arithmetic and displays up to 12 significant digits. It does not round before deciding whether the entered measured value exceeds the entered maximum.

Current standards status and boundary

ISO 5208:2015, Edition 4 – Industrial valves, pressure testing of metallic valves.

The official ISO record says the publication was last reviewed and confirmed in 2025 and remains current at stage 90.93. It covers examinations and tests used by a manufacturer to establish pressure-boundary integrity, closure tightness and structural adequacy. It is intended to be used with applicable valve product standards; where product-standard requirements differ, those requirements apply. ISO also states that pressure-test safety is outside this document’s scope.

Official ISO record

API Standard 598 – Valve Inspection and Testing.

The official API standards plan lists the published 11th edition dated 8 February 2023 and a 12th-edition project in development. This page does not repeat an old class-equivalence claim or assume that an API acceptance rule can be substituted for an ISO rate.

Official API standards plan

BS EN 12266-1:2012 – Mandatory requirements.

The official BSI record lists it as Current, Under Review, published 30 April 2012. Its scope covers production testing of metallic industrial valves and says the applicable product/performance standard prevails where requirements differ. Safety devices are excluded.

Official BSI record

NEEDS_LICENSED_SOURCE: the former embedded leakage-rate coefficients, drops/bubbles conversions, test-duration bands, pressure rules and ISO/API/EN class mappings were removed. They must not be restored until the exact licensed editions, applicable product standard, notes, units, boundaries and contractual precedence are checked line by line.

Official records checked 16 July 2026. No clause number, leakage coefficient, test pressure, duration or equivalence mapping is asserted from an inaccessible standard.

Interpretation questions

Why does this page not calculate leakage Rate A-G from DN?

Those coefficients and notes are normative licensed content, and the applicable valve product standard or purchaser specification can alter the governing requirement. A copied criterion with source evidence is safer than an unverified web transcription.

Why is there no automatic API 598 or EN 12266 mapping?

Different editions, valve types, seat constructions, sizes, media and contractual rules can change applicability. Similar-looking classes are not proof of equivalence.

Why does the page not calculate test pressure or duration?

Those are procedural requirements, not universal functions of DN alone. They must be taken from the applicable standard/product/purchaser documents and an approved safe test procedure.

Does “within entered limit” mean the valve is accepted?

No. It proves only the arithmetic comparison entered here. Acceptance also depends on correct documents, procedure, instrumentation, resolution, pressure, duration, valve configuration, witnessing and contractual authority.

Related tools

Revision: 16 July 2026. Result classification: user-entered record comparison; no normative criterion generated.