Work Instruction for Final Inspection and Testing of Valves

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1 Purpose: To ensure that the overall performance of the products meets the specified standards, and to guarantee that only products that have passed final inspection and testing are released for shipment. 2 The scope applies to the final inspection and testing of the company’s contracted products prior to delivery. 3 Inspection Requirements 3.1 Timing of final inspection: Before the product is delivered and shipped. 3.2 Conduct corresponding final inspections and tests in accordance with the product characteristics and contract requirements; these generally include: product performance tests (pressure tests), inspections before the finished products are stored, and inspections upon product delivery. 3.3 Valve performance testing (pressure test): a The pressure gauge used for the pressure test has an accuracy class of 1.5, with the pressure measurement range falling between 25% and 75% of the full scale of the gauge. b The pressure testing methods, testing media, pressure holding time, inspection items, etc. for general-purpose valves shall be carried out in accordance with the provisions of GB/T13927-92 ； When the contract specifies special requirements, those shall be followed. The testing requirements for c API valves shall be carried out in accordance with API598-2004. 3.4 Inspection before warehousing 3.4.1 The inspection items for finished products prior to warehousing are in accordance with the provisions in the \"Final Inspection Record\" table: a No water accumulation, corrosion, or dirt inside the valve ； b Inspect the specified protections at both ends of the valve, the exposed threads, and the pipe connections, etc ； c Conduct inspections and tests on the dimensional dimensions and connection dimensions as required ； d Check as required whether the overall appearance is properly assembled, flat, and secure. e. Apply oil: For products stored in inventory, apply rust preventive oil inside their cavities to prevent rusting ； f: Has the actuator been calibrated, and is the opening indication normal? ； 3.4.2 If the inspection in 3.4.1 fails, the item must first be stored separately, and measures should be taken promptly to bring it up to standard; in such cases, it is not necessary to fill out a failure report. 3.5 Delivery Inspection 3.5.1 Upon product delivery, the quality inspector checks each item against the contents of the \"Final Inspection Record\" ； 3.5.2 When delivering products in stock, pay attention to the length of time they have been stored; if a product has been in stock for more than half a year, it must undergo performance tests again and only then can it be delivered ； 3.5.3 Visually inspect the quality of the sprayed paint: it should be uniform, without overspray or residue ； 3.5.4 Verify whether the contents of the nameplate and certificate match the actual product ； 3.5.5 Check whether the separately packaged parts (such as handles) are missing ； 3.5.6 Check whether the packaging is appropriate and whether the labels on it are correct. 4 Pressure test marking 3.6.1 Products that pass the pressure test are placed in the qualified area 3.6.2 Products that fail the pressure test and require rework are marked on the valve itself ； a If the strength test fails and welding is required, mark a “○” at the area that needs welding; mark it if welding is not possible and the item is considered defective“×” ； b If the sealing test fails, draw a straight line at the position on the shell surface corresponding to the sealing surface. 3.6.2 Qualified products, unqualified products, and defective products after pressure testing shall be stored in designated areas. 5 Records 5.1 After the pressure test, an inspector fills out the \"Pressure Test Record\" ； 5.2 Before storage, after passing the inspection, the inspector fills out the \"Final Inspection Record\" and signs it before the items are stored ； 5.3 After the delivery inspection is successful, the inspector shall fill out the \"Certificate of Conformity\" and stamp it ； 5.4 If the pressure test fails, the inspector shall issue a “Nonconformity Report”, and the nonconforming product control procedure shall be implemented. 6 Criteria for final inspection and testing 6.1 The pressure testing inspector conducts the pressure test based on the marking indicating that the assembly has passed inspection; products without such a marking shall not be subjected to pressure testing ； 6.2 Products that have been in inventory for more than half a year shall undergo pressure tests again, in accordance with the operation instructions issued by the production department ； 6.3 Inspection certificates prior to warehousing: Inspectors conduct inspections based on the pressure test compliance mark; items without such a mark should be rejected. 6.4 Delivery inspection certificates: The product delivery inspector conducts inspections based on the contract assignment and the final inspection records; products that lack a mark indicating successful pressure testing should be rejected. 7 The handling of inspection results: The product can only be delivered for shipment after all specified final inspections and tests have been completed, the results meet the requirements, and it has been approved and signed by the inspector responsible for granting final product release.