Full definition
Quarter-turn (90°) valve with a spherical perforated obturator aligned with flow (open) or perpendicular (closed). High Cv, minimal pressure drop when fully open. Sizes: 1/4" to 12" (DN8 to DN300). Pressure: up to 420 bar. Temperature: -196°C to +200°C. Types: floating ball (seat compression) and trunnion-mounted (for high pressures). Materials: brass, 304/316 stainless, carbon steel A105. Standards API 6D, ISO 17292. Brands: Flowserve, Swagelok, Parker, Kitz, Velan.