Caliber Valves Pvt. Ltd. Manufactures Butterfly Valves. Caliber Valves Pvt. Ltd. Is an ISO 9001-2000 certified company. The Butterfly Valves are used in various industries. Specifications of these Butterfly Valves are: Complies Manufacturer Standard Sizes 15mm to 50mm Material Cast Iron - IS 210 Gr. FG 220 Trim SS 304 [Mesh] Type Screwed Cover Rating PN 16 Ends Screwed BSP