Buying a valve in South Korea: the inspection, paperwork and delivery steps a supplier list never mentions

You have a quotation from a Korean valve shop. The price works, the delivery week works, and the purchase order is ready to go out. What the quotation does not show is everything that starts the moment you send it, and most of that has to be settled before anyone cuts metal.

Get the sequence wrong and it is rarely the machining that slips. It is a certificate that has to be reissued — a round trip back to the manufacturer that nobody put in the schedule.

What the purchase order has to settle before anything is made

Three things on a valve order are cheap to decide beforehand and expensive to change afterwards: the inspection and test plan, the type of certificate, and the marking.

The inspection and test plan lists every test and examination and marks each one as review, witness or hold. A witness point means you are notified and the shop may proceed if nobody attends. A hold point means the work stops until it is released. It is common to mark everything as a hold point, then find that each is a separate notified visit and that the quoted delivery week did not assume six of them.

Certificate type is the one that is hardest to repair later. EN 10204 3.1 is issued by the manufacturer's inspection function, independent of production, against the material actually used. EN 10204 3.2 is the same inspection endorsed by an independent party, either your own representative or an agency you appoint. That party has to be in place before the material is released, because what is endorsed is an inspection happening at that moment. Asking for 3.2 once the valve is assembled means going back to whatever retained material exists and having it retested under the third party's eyes. Where nothing was retained, it means new material rather than a new document.

Marking is the third. Tag number format, the language on the nameplate, whether the tag plate is fitted to the valve or shipped loose, stamped or laser-etched. There is a default underneath part of that — MSS SP-25 in the American scope, EN 19 or ISO 5209 in the European one — but what those fix is the manufacturer, the rating designation, the materials and the service limits. The tag number your site indexes by is not in them; it sits in the owner's specification. Where the purchase order is silent the shop marks to the standard, which is complete and legible and still not what the receiving site is expecting.

What a witnessed FAT actually books

The factory acceptance test is the shell test and the seat test, plus whatever the inspection and test plan added: positive material identification, non-destructive examination, a functional stroke with the actuator fitted. Which standard governs the seat test depends on the valve. Isolation valves — gate, globe, plug, ball, check, butterfly — are the types API 598 names, and it reaches others only by agreement between purchaser and manufacturer. Control valve seat leakage is graded instead to ANSI/FCI 70-2, which the older ANSI B16.104 became, or to the IEC equivalent, IEC 60534-4. Durations scale with valve size and both standards have been through several editions, so the plan should name the standard and the edition, not only the number.

The inspector's morning is mostly paperwork before the first valve reaches the bench. Calibration certificates and expiry dates for the pressure gauges and the rig, heat numbers checked against the material certificates, the drawing revision the valve was built to. The tests take minutes. Most of a witnessed FAT is the records.

Notification decides whether the visit happens at all. The purchase order states the notice period in working days; where it does not, the shop follows its own practice, and five working days does not book an international flight and a plant pass. If you are not travelling, agencies with resident inspectors in Korea can be appointed instead, usually names already on your quality department's approved list, but the appointment has to exist before the notice date. Where the valve is built in Korea rather than shipped in from the maker's other plants — KOSO Korea is one such case — the test bay and the document set are at the address you are notified from, which changes what the notice period has to cover.

What the test does not cover matters too. The valve is pressurised at ambient temperature with water or air, which says nothing about how the trim behaves at process conditions. The seat test confirms only that the valve met the leakage class written on the order, and which class that is was settled at the quotation stage. It cannot be raised afterwards on paper.

The documents, and the point at which each has to be asked for

Any relief valves in the same package follow a separate route: their records are read at head office, later, by people who never saw the shop, so the set pressure test record has to stand on its own.

The clocks that run outside the valve shop

Three of them, and none appears on the manufacturing schedule.

Strategic item classification. Before anything leaves Korea the item is classified against the export control lists, either by the exporter itself or by expert determination, applied for through YesTrade, the national export control system, and issued by KOSTI, the Korean Security Agency of Trade and Industry, which was the Korea Strategic Trade Institute until 2024. A determination runs for two years from its date under the current rules and is held by the applicant, so it is the exporter's own that counts. Ordinary industrial valves usually come back as non-controlled, but the record is what a forwarder or a bank asks to see, and the answer turns on end use and destination as much as the model. The control lists and the procedure are revised, so ask at quotation stage whether a determination exists and whether the exporter has checked that it still stands.

The loading clock. Under Article 251 of Korea's Customs Act, goods have to be loaded onto the carrier within 30 days of the export declaration being accepted, with an extension available on application. In practice the declaration is filed against a booking, so if the vessel slips, or if you hold goods at the shop after they have cleared, someone has to file for that extension. Customs rules are amended, so confirm the current wording with your forwarder before planning around it.

Origin. If your site is in the European Union, the preferential rate under the Korea–EU agreement rests on an origin declaration made out on the invoice, and for a consignment above EUR 6,000 that declaration can only be made by an exporter that Korea Customs has designated as an approved exporter. The designation is applied for and reviewed, not arranged in the week before shipment. Without it the goods are exportable exactly as before, but the preference is not available on that consignment. Other agreements use different forms and issuing bodies, so settle early which document your customs will accept and who issues it.

Packing, marking and the way the piece leaves the shop

Wooden crates leaving Korea carry the ISPM 15 mark, heat treated or fumigated. That part is routine. Preservation is not: it is a specification item rather than a standard — flange protectors, moisture barrier and desiccant, the position the valve ships in, and the period the preservation has to hold. A valve that sits in a lay-down yard for eight months in a coastal climate was either packed for that or it was not, and that was decided on the packing instruction, not at the yard.

Where the receiving end is itself a Korean site — common when an overseas contractor buys locally for a plant being built in Korea — the marking rules come from the Korean owner's specification rather than yours, and the gate pass, the safety induction and the receiving window matter as much as the truck. That side of it runs on its own sequence. Oversized or overweight pieces need a road transport permit and often move at night, arranged around the loading date rather than after it, and the route and the lifting equipment decide the vehicle rather than the other way round.

What commissioning asks for and does not find

The FAT file proves the body held pressure on one day in a test bay. Months later the commissioning team works from a different list, usually the one nobody asked for at the order stage: the actuator's bench set and the stroke record for that serial number, the positioner calibration sheet with the air supply pressure it was set at, the limit switch positions, and soft goods part numbers tied to the serial rather than to the model.

The air supply is the one that comes back most often. A valve stroked at the shop's bench air and then run on plant air at a lower pressure does not reach full travel, and the first assumption on site is that something is wrong with the valve. The stroke itself was almost certainly done. Whether its record left the shop depends on whether the document list asked for it. With that record in the file the question is settled in an afternoon rather than a week spent on the wrong equipment.

Tag plates are the other one. Where they ship loose, they arrive together in a single bag and the crew matches serial numbers against a packing list to work out which valve is which before anything can be installed. One line on the order saying plates are fitted and legible before packing takes that sorting job off the receiving crew.

Send the datasheet and the pages of the owner's specification covering inspection and marking, and we will come back with what has to be on the purchase order before production starts.