Full definition
On/off valve with a disc (gate) sliding perpendicular to flow, actuated by a threaded stem. Minimum pressure drop when fully open (very high Cv). Not suitable for throttling (disc vibration causes damage). Sizes: 2" to 72". Materials: cast iron, carbon steel (WCB), stainless CF8M. Actuation: handwheel, gear, electric, pneumatic. Standards API 600, ASME B16.10. Brands: Crane, Velan, Walworth, Flowserve, Bonney Forge.