How to Verify Valve Certifications: API 6D, ASME B16.34, ISO 9001 Guide for Buyers

To verify a valve certification, identify the exact claim first: a product-standard license, a management-system certificate, conformity assessment, a type or qualification test, or material compliance. Then confirm the legal entity, manufacturing location, scope, status, dates, and quoted product through the issuing body or official directory. A certificate PDF alone is not sufficient evidence.

What is the difference between a standard, certificate, license, and test report?

A standard states technical or management requirements. A certificate records a certification body's decision within a defined scope. A license may authorize a manufacturer at a named facility to apply a protected mark to conforming products. A test report records results for identified samples under stated conditions. These documents are related but not interchangeable.

A valve advertised as “designed to ASME B16.34” is not automatically ASME-certified. An ISO 9001 certificate does not certify an individual valve. A material test report does not prove that a manufacturer holds an API Monogram license.

What should be checked on every certificate?

Check the exact legal company name, manufacturing-site address, certificate or license number, issuing certification body, accreditation body where applicable, standard and edition, scope, issue and expiry dates, current status, and any annex listing additional sites or products.

Compare these details with the quotation, purchase order, nameplate, material certificates, inspection reports, and shipping documents. Differences in English translation, group-company name, address, or factory location require written clarification.

How to verify an API Monogram license

Use the API Composite List and search by company name, license or certification number, specification, product, country, and status. Confirm that the entry is Active, the facility address matches, and the licensed product scope covers the valve being offered.

API defines status categories such as Active, Applicant, Canceled, Expired, Inactive, Suspended, Transitioned, and Withdrawn. An applicant is not authorized to use the relevant mark. A license held by a related company or another factory does not automatically cover the quoted manufacturer.

What does the API Monogram on a valve mean?

API describes the Monogram as a voluntary licensing program. Licensed manufacturers may apply the registered mark to new conforming products made at the licensed facility under a quality management system meeting API Spec Q1 and the applicable product specification.

Verify the product marking, license number, date of manufacture where required, and traceability to the manufacturer's records. Do not accept an API logo on a brochure, website, quotation, or generic certificate as evidence that a specific shipped valve is eligible for the mark.

API 6D and API Spec Q1 are not the same claim

API 6D is a product specification for pipeline and piping valves. API Spec Q1 sets quality-management-system requirements for manufacturing organizations in the petroleum and natural-gas industry. The API Monogram program links a licensed product scope with Q1-based manufacturing-system requirements, but a Q1 registration alone does not authorize an API 6D Monogram.

Check both the facility's license or registration details and the product scope relevant to the order. Purchase specifications should state whether API Monogram marking is required or whether conformance to selected technical requirements without the mark is acceptable.

How to verify ISO 9001 certification

Request the complete certificate and search the organization or certificate number in IAF CertSearch where available. Confirm the certificate status, ISO 9001 standard, certified scope, locations, certification body, accreditation body, and whether the accreditation body is an IAF MLA signatory for the relevant scope.

If the record is not found, do not immediately conclude that the certificate is false; IAF CertSearch notes that some records may not be present or publicly available. Contact the named certification body and, if needed, its accreditation body using independently obtained contact information.

What ISO 9001 does—and does not—prove

ISO 9001 specifies requirements for a quality management system. Accredited certification can provide confidence that the named organization and scope were assessed, but it does not prove that every valve meets API 6D, ASME B16.34, a leakage class, or the buyer's specification.

Use ISO 9001 verification as one part of supplier qualification. Product conformity still requires drawings, materials, procedures, inspection, testing, traceability, and order-specific records.

Is ASME B16.34 a manufacturer certificate?

ASME B16.34 is a valve standard covering subjects such as pressure-temperature ratings, materials, dimensions and tolerances, non-destructive examination, testing, and marking for valves within its scope. It is not, by itself, a general manufacturer certificate that buyers verify through the ASME certificate-holder directory.

For a B16.34 claim, ask the supplier to identify the edition, product scope, design basis, material group, pressure-temperature rating, wall-thickness basis, NDE, testing, and marking evidence. Do not confuse B16.34 conformance with ASME Boiler and Pressure Vessel Code authorization certificates or certification marks.

How to evaluate CE and EU Pressure Equipment Directive claims

CE marking is a legal conformity mark, not a generic quality award. Determine whether the valve or assembly falls within the Pressure Equipment Directive, its category, conformity-assessment module, and whether a notified body is involved. Check the EU Declaration of Conformity, technical documentation references, manufacturer identity, product identification, applied legislation and standards, and notified-body number where applicable.

Verify notified bodies through the EU NANDO system. A CE logo on a catalogue or a document titled “CE certificate” is not enough to establish the applicable legal route or coverage of the shipped product.

Is NACE MR0175 or ISO 15156 a certificate?

ANSI/NACE MR0175/ISO 15156 is a materials-selection and qualification standard for H2S-containing oil and gas production environments. It is not a blanket manufacturer certification, and the phrase “NACE material” is incomplete.

Verify the defined service environment and the exact material, heat treatment, hardness, manufacturing route, product form, welding condition, and any environmental or application limits. Material test reports and manufacturing records must be traceable to the supplied components.

How to verify fire-safe and fugitive-emission claims

Request the complete test report or certificate, test standard and edition, test laboratory, specimen manufacturer and model, valve size and pressure class, materials, seat and seal construction, test direction, result, date, and the manufacturer's rules for extending qualification to other sizes or configurations.

A passing test on one sample does not automatically cover every valve with a similar name. Compare the shipped design with the tested construction and document the permitted qualification range.

How to verify material certificates and EN 10204 documents

Check document type, manufacturer, purchaser and order references, material specification and grade, heat or lot number, product form, dimensions, chemical composition, mechanical properties, heat treatment, supplementary tests, dates, and authorized validation. Trace the heat or lot identity through the component marking and manufacturing records.

An EN 10204 type 3.1 inspection certificate is validated by the manufacturer's authorized inspection representative independent of the manufacturing department. It is not the same as third-party inspection, and it does not by itself prove valve design or assembly conformity.

Check the certificate against the actual shipment

Build a document matrix linking each valve tag or serial number to the purchase order, data sheet, drawing revision, bill of material, material records, welding and NDE records, pressure test, coating, marking, nonconformance dispositions, and release note. Certificate validity on the order date is only one part of conformity.

Inspect nameplates and body markings for altered numbers, inconsistent fonts, impossible dates, wrong addresses, missing traceability, or certification marks outside the documented scope.

Common red flags

Red flags include cropped or low-resolution certificates; missing annexes; a different legal entity or address; certificate numbers that do not exist in the issuer's system; expired, suspended, or applicant status; edited dates; an unaccredited certification body presented as accredited; a scope limited to sales rather than manufacture; and logos used without a traceable license.

Also question phrases such as “API approved factory,” “ASME B16.34 certificate,” “NACE certified valve,” “all products CE certified,” or “ISO-certified valve” when the seller cannot identify the exact program, scope, product, and evidence.

What if a certificate cannot be verified?

Pause reliance on the claim and request written clarification from the supplier. Contact the issuer or directory using contact details obtained independently, not only those printed on the document. Ask for the current certificate, annexes, audit or licensing scope, and a mapping to the quoted product.

If the claim affects safety, legal market access, or a contractual mark, do not release manufacture or shipment until it is resolved. Record the discrepancy through the supplier's nonconformance process and agree corrective action.

Frequently asked questions

Does an active API license mean every valve from that company is Monogrammed?

No. The facility, product specification, licensed scope, manufacturing location, product conformity, and marking requirements all matter. Verify the specific supplied valve and its traceability.

Can a trading company use a factory's certificates?

A trader may supply products made by a certified or licensed factory, but it must not imply that the trader itself holds the certificate. The actual manufacturer and facility should match the certificate and shipment records.

Does third-party inspection certify the valve?

Not automatically. An inspection agency reports against an agreed scope. Its visit does not create a product license or replace the manufacturer's conformity responsibility and the buyer's technical specification.

Official verification sources

API Composite List — real-time API Monogram license and APIQR registration status: https://mycerts.api.org/search/compositesearch

API directory and explanation of the Composite List: https://www.api.org/products-and-services/api-monogram-and-apiqr/directory

API fraud alerts for false certificates and claims: https://www.api.org/products-and-services/api-monogram-and-apiqr/fraud-alerts

IAF CertSearch guidance for verifying accredited management-system certificates: https://support.iafcertsearch.org/verifiers/certificate-verification/how-to-verify-a-company-certificate

ASME B16.34 official standard page and scope: https://www.asme.org/codes-standards/find-codes-standards/b16-34-valves-flanged-threaded-welding-end/2017/pdf

ISO 15156 official material-selection context for H2S-containing oil and gas production environments: https://www.iso.org/obp/ui?_escaped_fragment_=iso:std:iso:15156:-2:dis:ed-5:v1:en

How Wofer handles certification requests

Wofer will review the certification, conformity, testing, marking, and documentation requirements stated in an RFQ and identify what can be supplied for the specific product and manufacturing route. Buyers should verify every project-specific certificate or license through the relevant issuer or official directory. Wofer does not rely on a generic website statement as a substitute for order-specific evidence.

Ted Wang | WeChat/WhatsApp: +86 18267833722 | Email: sales@wofervalve.com | Website: www.wofervalve.com