The API 600 / BS 1873 / BS 1868 family of Audco (L&T) Gate, Globe and Swing Check Valves is exceptionally sturdy, rugged and durable, with a reputation for quality, integrity and long service. They are designed for tight sealing and ease of operation. The valves are available with flanged ends or buttweld ends, in pressure ratings from ASME Class 150 to Class 1500, and in a variety of materials of construction. Gate Valves are of flexible wedge, outside screwand-yoke and bolted-bonnet construction. The valves conform to API 600.