Pre-Shipment Inspection (PSI)
Quantity, packing and marks, AQL sampling, workmanship, dimensions and nameplate checks before you pay the balance.
Details →Third-party QCIndustrial valvesMachineryNingbo · Zhejiang, China
Valve & Machinery Inspection in Ningbo / Zhejiang
Independent eyes on the factory floor. ValveWitness Inspection witnesses valve pressure tests and carries out pre-shipment inspection, during-production checks, loading supervision and factory audits for overseas buyers sourcing industrial valves and machinery from Ningbo and the Zhejiang valve cluster.
Request an inspectionSee pricingThird-party inspection services for valves and machinery
Fact-based on-site checks with photo evidence and a clear PASS / FAIL / PENDING conclusion in English.
During Production Inspection (DUPRO)
Catch workmanship and dimension problems mid-production, while there is still time to correct them.
Details →Valve Pressure Test Witnessing
Witness shell, seat and backseat tests to API 598, API 6D, EN 12266-1 or ISO 5208, as named in your PO.
Details →Loading Supervision
Container or truck loading watch: count, packing condition, container condition, seal photos.
Details →Factory Audit
Practical supplier check of capability, basic quality control and gauge calibration before you place an order.
Details →Optional add-ons
- Coating DFT measurement
- PMI witness on the factory’s calibrated XRF
- Operation / functional check per your checklist
Valve inspection in Ningbo, close to the Zhejiang valve belt
Based in Ningbo High-tech Zone. Ningbo-area factories are usually a same-day trip; Wenzhou, Taizhou and Lishui are reached by high-speed rail.
Ningbo
Beilun, Fenghua, Yuyao, Cixi, Ninghai — about 1–2 hours by road.
Wenzhou (Oubei / Longwan)
China’s industrial valve hub. Fastest train Ningbo–Wenzhou South about 1 h 38 min.
Taizhou (Wenling / Yuhuan)
Pumps and plumbing valves. Train to Wenling about 1 h 7 min; Yuhuan by road.
Lishui and beyond
Growing valve cluster; train about 2 h 51 min. Travel quoted before acceptance.
Why buyers use ValveWitness
We witness the pressure test, not just the paperwork.
Valve-focused
Checklists built from public standards — API 598, API 6D, EN 12266-1, ISO 5208, ISO 2859-1 and MSS SP-25 — for the products made in this region.
Evidence first
Time- and GPS-watermarked photos, pressure holds on video where the factory permits, and the original image pack shared with you.
Fast English report
Normally within 24 hours of the visit, with a clear conclusion you can act on before releasing payment.
Independence
We report facts only and do not accept gifts or “arrangements” from factories.
Honesty note: ValveWitness Inspection is a small independent service based in Ningbo. We do not claim accreditation logos, invented client lists or inflated company history. Scope and limitations are written into every quotation.
Transparent pricing
From USD 220–260 per man-day in the Ningbo area, including the English report, photo pack and local travel. Travel outside Ningbo is confirmed in writing before the job.
See pricingSee what you get
Download a sample valve pre-shipment inspection report. All data in it are fictitious and clearly marked EXAMPLE.
Sample report