Full definition
Quarter-turn valve with a disc rotating on a central shaft. Compact, lightweight, economical. High Cv. On/off or moderate throttling. Sizes: 2" to 120" (DN50 to DN3000). Pressure: up to 25 bar (concentric) and 100 bar (triple-eccentric). Types: concentric (elastomer, 200°C), double-eccentric, triple-eccentric (metal-metal, high temperature). Standards: API 609, EN 593. Brands: Emerson (Keystone), Flowserve, Bray, Tyco.