AF51 & 52 - Fire Safe Series These single-piece Ball Valves are high performance valves which come with a one-piece integrally flanged body, in sizes of up to 200mm. This design offers the unique advantage of eliminating the possibility of external leakage to the atmosphere through bolted body joints. These environment-friendly and highintegrity valves are preferred in critical applications where the media is expensive, volatile or toxic, and where external leakage or wastage is unacceptable.