Caliber Valves Pvt. Ltd. Offers FS Ball Valves. Caliber Valves Pvt. Ltd. Is an ISO 9001-2000 certified company. The FS Ball Valves are used in various industries. Specifications of FS Ball Valves are: Complies: BS 5351 Sizes: 6mm to 50mm Material: FS - ASTM A105 Trim: AISI 304 / 316 Type: Three Piece Rating: Class 800 Ends: Screwed / Socket Weld