All Stainless Steel Knife Gate Valves Catalog: VEL-KGV-2003 Sizes: 2-36" (50-900mm) ASME Pressure Class: 150 Velan is pleased to introduce our second generation knife gate valve. Almost 20 years of experience in supplying one of the most robust and dependable knife gate valves on the market has enabled us to optimize the design into a more efficient, feature rich package.