Why Inconel 718 for Valves
Valves in critical service applications must contain high pressures while resisting corrosion, erosion, and mechanical degradation over service lives measured in decades. Inconel 718 is specified for valve bodies, bonnets, stems, seats, and trim when operating conditions exceed the capability of stainless steels—typically involving temperatures above 800°F, sour gas environments (H2S per NACE MR0175), high-pressure differentials exceeding 10,000 PSI, or combinations of these factors. The alloy's 180+ ksi tensile strength allows thinner wall sections compared to lower-strength alternatives, reducing weight and material cost.
Manufacturing Capabilities
CastAlloy produces Inconel 718 valve components through investment casting for bodies with complex internal flow passages and port geometries, closed-die forging for maximum pressure integrity in high-pressure bodies and bonnets, and precision CNC machining for valve stems, seats, disc assemblies, and trim components requiring tight tolerances and fine surface finishes. We support valve designs to API 600, API 602, API 608, API 6A, and ASME B16.34 specifications with pressure ratings from Class 150 through Class 2500 and beyond.
Testing and Certification
Valve components undergo hydrostatic shell testing per API 598, mechanical property verification per ASTM B637, hardness testing per NACE MR0175 (HRC 40 max for sour service), and full NDE including ultrasonic, radiographic, and penetrant inspection as required by the valve specification. Complete material traceability and documentation packages are provided. Contact us for a valve component quotation.