Valve Manufacturing Process

• The valve is designed with computer-aided design (CAD/CAM) software.
• Its strength under service conditions is examined by finite element analysis and the design is improved accordingly.
• On pig valves the face-to-face dimension can be adapted to the customer's line.

API 6DASME B16.34ASME B16.10

• Materials are procured in accordance with technical specifications.
• Each batch is delivered with a test certificate stating its chemical and mechanical values.
• Incoming material is inspected for dimensions, appearance and certification.

EN 10204 3.1

• The body, closure, stem and seat rings are machined to size on CNC lathes and machining centres.
• Machining is carried out at two facilities, in Dilovası and Sakarya.
• After each operation the dimensions of the part are checked against the technical drawing.

• Carbon steel balls are nickel plated (ENP).
• After plating the surface is polished and inspected.
• The body of fully welded valves is closed by welding.

• Parts are assembled in the sequence set out in the work instruction.
• The body studs are tightened crosswise to the specified torque value.
• After assembly the operating torque is measured and recorded.

• Every valve is tested individually before shipment.
• The shell test is carried out at 1.5 times and the seat test at 1.1 times the working pressure.
• On request, a leak test with air at 6 bar is also applied.

API 6DAPI 598ISO 5208

• The valve is painted; paint thickness and adhesion are checked.
• The size, pressure rating, material, date of manufacture and serial number are marked on the nameplate.
• The serial number provides traceability of the product.

• The end connections are closed with covers to prevent the ingress of foreign matter.
• Valves are shipped on pallets in boxes or wooden crates.
• Heavy valves are handled by their lifting lugs.