The Bi-directional Bevel Gear Knife Gate Valve is designed with a pressure rating of PN10 (Class 150 LB) and is available in sizes ranging from DN50 to DN1200 (2 inches to 48 inches). The valve body is made of Ductile Iron GG40 and is operated using a bevel gear mechanism, making it suitable for applications requiring reliable bi-directional flow control.China Manufacfturers.