What Happens When a Lot of OEM Ball Valves Fails Incoming Inspection?
Key Takeaway
A failed receiving inspection is a decision about the lot, not about each valve in it: the sample held defects beyond what the agreed plan allows. The first day is about containment. Hold the lot apart, keep it in its cartons, photograph it, and tell the supplier in writing with the lot and heat numbers and the defect counts. The lot then ends in one of four ways, which are rework, use as is under a written concession, replacement, or return. Who pays depends on the contract, so the inspection plan, the notice window, the cost split and the records should be written into the supply terms before the first order. A plant with its own foundry can return unrepairable castings to the furnace and trace a defect to a pour.
What does it mean when a lot fails incoming inspection?
That the sample drawn from the lot held defective valves beyond the number the agreed plan allows, so the lot as a whole is not accepted. The decision belongs to the lot, not to each valve in it. Sampling plans such as the ones in ISO 2859-1 work that way: a sample is inspected, the defective valves are counted against an acceptance number, and the lot is accepted or not. How Do You Inspect a Lot of Stainless Steel Ball Valves Before It Ships? explains how the sample size and the acceptance number are set, and the same arithmetic applies at the receiving dock.
A failed sample does not say which valves in the lot are bad. It says the lot’s defect rate probably exceeds the level both sides agreed to accept. What follows is a choice between sorting the lot, returning it, replacing it or accepting it with a concession, and each of those needs the supplier’s agreement or a contract clause that already covers it.
A worked case shows the scale. In the plan described in that article, a lot of 4,000 valves at General Level II takes a sample of 200 and is not accepted when 11 of them are defective. Eleven in 200 is 5.5 per cent. That is an estimate for the lot and not a measurement of it, and the share among the other 3,800 valves could be higher or lower. The arithmetic is mine, from that article’s figures.
What should the buyer do in the first day?
Stop the lot from reaching the line, and keep the evidence as it is. ISO 9001 clause 8.7 asks an organisation to identify and control a nonconforming output so that it is not used or delivered by mistake. CertBetter’s summary of the clause lists containment, meaning separating the output from conforming stock, among the actions available. For a buyer holding a failed lot that comes down to three moves: mark the lot as on hold, move it away from released stock, and leave it in its original cartons.
Make three records before anyone opens a carton further than the inspection needs. Photograph the cartons, labels and defects as found. Write the lot and heat numbers from the valves and cartons against the purchase order. Note the sample size, the method and the count of each defect type, because the supplier’s first question will be how the number was reached. These steps are common practice, not a requirement of any one standard.
What does the supplier need to be told?
Enough to find the same lot in its own records. A message that says the valves leak gives the supplier nothing to investigate. A useful notice carries the order number, the lot and heat numbers, the quantity received, the sample drawn, the defects counted by type, the test or measurement used and the photographs. It goes in writing, because a contractual notice window runs from a written notice.
Two published valve warranties show how different those windows can be. Asahi/America asks for written notice within 14 business days of discovery. Elkhart Brass allows claims up to 30 days after its warranty period ends. An inspection that finds the problem on day three and sends the notice on day twenty may lose its position under the shorter wording, so the notice should go out with the inspection report, not after it.
What can happen to the lot?
Four outcomes are common: rework, use as is, scrap or replacement, and return to the supplier. CertBetter lists these four as the dispositions found in practice. Which one fits depends on the defect and on the contract. The table shows how the choice usually runs and what evidence to ask for.
| Outcome | When it usually fits | What the buyer should require |
|---|---|---|
| Rework or sort | The defect can be found on each valve by a test or a gauge, so the good valves can be separated or the bad ones corrected | A record of the re-inspection of every valve in the lot, and re-verification of the corrected valves |
| Use as is | The defect does not affect fit or function in the buyer’s use, such as a marking or finish deviation | A written concession from a named authority, stating any change to price or warranty |
| Scrap and replace | The defect is in the material or the construction and cannot be screened out, such as the wrong alloy or a casting flaw | A replacement lot with its own test record and its own material certificate |
| Return to supplier | The lot is rejected and the buyer does not want to sort it | Agreement on who pays freight and when credit or replacement follows |
The rows illustrate how the choice tends to go and are not rules. Two points come from ISO 9001 as CertBetter summarises it: a corrected output has to be re-verified, and a concession has to be formally authorised, by an internal manager or by the customer if the requirement came from the customer. A “use as is” agreed in an email thread, with no named approver, leaves nothing to point to later.
Who decides, and who pays?
The contract does, and an inspection failure raises cost questions that a warranty clause rarely answers. The published warranties show the range. Asahi/America makes the customer bear the supplier’s costs if the examination finds no defect. Elkhart Brass has the claimant prepay shipping and does not reimburse removal and replacement labour without prior written approval. Valves that fail at receipt have not been installed, so removal labour does not arise. The costs that do are freight both ways, labour to sort or re-inspect, and any stoppage on the buyer’s line.
Whether a buyer may reject at receipt or has to proceed as a warranty claim depends on the contract and on the governing law, and that is a question for counsel. Who carries the loss of valves damaged before delivery depends on the trade term in the quote; see What Does the Incoterm on a Ball Valve Quote Actually Decide?
What should the supplier’s investigation answer?
What failed, why, how far it reaches, and what changes. A reply that says the cause is under review and the next lot will be fine answers none of them. The four questions turn a complaint into something that can be checked.
- What failed: the defect mode and where it sits on the valve.
- Why it happened: the cause in material, process, tooling or test, and the evidence for it.
- How far it reaches: which other lots share the same heat, tool, shift or date of manufacture, including stock already shipped to other customers.
- What changes: the corrective action, and how its effect will be verified on the next lot.
The third question depends on the supplier’s records. A casting can be tied to its heat only if the foundry kept the link; What Does an EN 10204 3.1 Certificate Prove on a Ball Valve? sets out what a material certificate does and does not prove. Some defects can stay hidden through a pressure test, as What Casting Quality Does to a Ball Valve: Porosity, Inclusions and Field Failure explains. Whether the plant melts its own castings or buys them, covered in Sourcing Ball Valves from Taiwan: What Differs Between Factories, and How to Check, decides whose records the trace runs through. That is a reading of how records are held, not a published finding.
What does this look like at a plant with its own foundry?
Failed castings can go back to the furnace, and the trace from a defect to a pour stays inside one set of records. LINS Valve states on its page Stainless Steel Ball Valve OEM Manufacturer in Taiwan that it melts its own castings in a foundry on site since 1983, with heat numbers traceable to the specific casting. It describes its handling of a defective part in four steps: find and isolate it, analyse the problem, deal with it, and keep the records. How it is dealt with depends on the part. A cast metal part that cannot be repaired goes back to the furnace to be remelted, and a part that can be repaired is reworked and inspected again.
Read alongside ISO 9001 clause 8.7 as CertBetter summarises it, the four steps match the actions the clause lists, which are containment, correction with re-verification, and records. That is a reading of two descriptions, not a certification claim, and it is the manufacturer’s own account. A buyer should ask any supplier, this one included, for the written procedure and one completed record, and check those instead of the description. A plant that buys its castings follows the same four steps, but the second and third depend on a casting vendor agreeing to take part.
How are the next lots checked?
More strictly, for a while. ISO 2859-1 includes switching rules that move inspection from normal to tightened when lots are not accepted, and that allow sampling inspection to be stopped if rejections continue. SQC Online’s chart of the rules does not state which edition it reflects, so take the thresholds from the standard itself. A buyer can write the switch into the contract: after a failed lot, the next lots are inspected at the tightened level until a stated number are accepted.
If the corrective action changes the process, the first lots after it may need approving again; see How Do You Approve a Stainless Steel Ball Valve Sample From a New Supplier? If failures repeat and the supplier cannot show a cause, the buyer is heading toward a change of source, which Changing Valve Supplier: What Has to Be Re-Qualified sets out.
Which records should both sides keep?
The nonconformity, the action taken, any concession and who authorised it. That is the list CertBetter gives for clause 8.7.2 of ISO 9001, and its page adds the result of the re-verification and any notice to the customer as records worth keeping. The buyer’s receiving records matter most, because they fix the date and condition of the lot on arrival, which is where every later argument about cost starts.
What belongs in the supply terms?
The clauses that decide a failed lot, written before the first order and not worked out after the first failure.
- The receiving inspection plan: sample size, inspection level, defect classes and the acceptance numbers for each.
- The inspection window after delivery, and the form and time limit for notice.
- What the notice must contain, so that both sides can identify the lot.
- The time in which the supplier acknowledges the notice and delivers its investigation.
- The outcomes available (rework, use as is, replacement, return) and who chooses between them.
- The split of cost for freight both ways, sorting, re-inspection and line stoppage.
- The lead time for a replacement lot, and the test record and material certificate it must carry.
- Tightened inspection on the next lots, and what ends it.
- The records each side keeps, and for how long.
A short review of the final wording by counsel is worth the cost for a programme that will run for years. The specification the lot is inspected against is written in the order; What Should an RFQ for OEM Stainless Steel Ball Valves Contain? covers what belongs in it.
Frequently asked questions
What does it mean when a lot of valves fails incoming inspection?
The sample drawn from the lot held defective valves beyond the number the agreed plan allows, so the lot is not accepted. It is a decision about the lot. It does not say which individual valves are bad.
Should valves from a failed lot be installed anyway?
Not until the lot has been dispositioned. ISO 9001 clause 8.7 asks for a nonconforming output to be identified and controlled so that it is not used by mistake. Hold the lot apart, in its cartons, until rework, a written concession, replacement or return has been agreed.
How quickly should the supplier be told?
As soon as the inspection report is complete, and in writing. Published warranty notice windows vary, from 14 business days in Asahi/America’s wording to a claim period that runs for 30 days after the warranty ends in Elkhart Brass’s, so the contract should state the window.
What are the possible outcomes for a failed lot?
Rework or sort, use as is under a written concession, scrap and replace, or return to the supplier. Which one applies depends on the defect and the contract.
Who pays to send a failed lot back?
The contract decides. Published warranties differ: Asahi/America has the customer bear the supplier’s examination costs if no defect is found, and Elkhart Brass has the claimant prepay shipping. Freight in both directions, sorting labour and line stoppage should be allocated in the supply terms.
What does ISO 9001 clause 8.7 ask a supplier to do with a nonconforming product?
According to CertBetter’s summary of clause 8.7, the organisation identifies and controls the output, takes action such as correction or containment, informs the customer if the product has already been delivered, gets any concession formally authorised, re-verifies corrected output and keeps records of the nonconformity, the action, the concession and who authorised it.
Can a failed casting be remelted?
At a plant with its own foundry, yes. One manufacturer with its own foundry describes sending a cast metal part that cannot be repaired back to the furnace to be remelted, while a repairable part is reworked and inspected again. A plant that buys its castings depends on its casting vendor for that step.
What happens to the next lot after a failure?
ISO 2859-1 has switching rules that move inspection to a tightened level after lots are not accepted. A buyer can write the same switch into the contract so that the next lots are checked more strictly until a stated number are accepted.
Related Articles
- How Do You Inspect a Lot of Stainless Steel Ball Valves Before It Ships?
- How Do You Approve a Stainless Steel Ball Valve Sample From a New Supplier?
- What Does an EN 10204 3.1 Certificate Prove on a Ball Valve?
- What Casting Quality Does to a Ball Valve: Porosity, Inclusions and Field Failure
- Changing Valve Supplier: What Has to Be Re-Qualified
- Sourcing Ball Valves from Taiwan: What Differs Between Factories, and How to Check
- What Does the Incoterm on a Ball Valve Quote Actually Decide?
- What Should an RFQ for OEM Stainless Steel Ball Valves Contain?
- Stainless Steel Ball Valve OEM Manufacturer in Taiwan
Referenced sources: CertBetter, Guide to ISO 9001 Clause 8.7, SQC Online, Switching Rules (ISO 2859-1), Asahi/America, Valve and Actuation Warranty, Elkhart Brass, Unibody Valve Limited Warranty.
The ISO 9001 clause 8.7 requirements are taken from CertBetter’s published summary because the standard text is sold by ISO, and the ISO 2859-1 switching rules are shown as a third-party chart that does not name its edition. Both should be checked against the standards. The two warranties are published by their makers for their own products and are quoted only to show how far notice and cost terms can differ. The account of how a plant with its own foundry handles a defective part is the manufacturer’s own description from its published page and has not been checked independently. The first-day steps, the table of outcomes and the reading of how records are held in a plant with its own foundry are observations from practice, not published findings. This article is general information and not legal advice, and contract wording should be reviewed by counsel.