013255470-N0010426QNE86-DWG-10-20-26.pdf

This document is a specification for the procurement of TORLON and ULTEM valve seats for use in ball valves, issued by Electric Boat Corporation as Specification No. 4147B, effective October 19, 2021.

The specification establishes requirements for manufacturing valve seats from four material grades: TORLON 4203 (extruded), TORLON 4203L (injection molded), TORLON 4503 (compression molded), and ULTEM 1000. Raw materials must be supplied by approved manufacturers including Drake Plastics LTD of Cyprus, Quadrant EPP USA Inc. of Reading PA, and GF Plastics of Pittsfield MA. Physical properties are specified in four tables with minimum mechanical requirements for hardness, tensile strength, compressive strength, tensile impact, and water absorption across the material grades. The specification includes detailed machining guidelines for both TORLON and ULTEM materials covering turning operations, conventional machining, annealing, coolants, cleaning, and packaging. Machining recommendations address feed rates, speeds, tooling specifications, and surface finishes. Quality assurance provisions require smooth finishes free of defects, supplier responsibility for inspection and testing, and optional skip lot testing. Supplier qualification requires mechanical testing per ASTM standards (D785, D638, D695, D1822, D570) for new material sources. Revision B permits Navy Oxygen Cleaner use with TORLON parts limited to 12-hour exposure. The specification requires certification of conformance for each material order and specifies packaging in heat-sealed, moisture-proof containers with identification markings.