Hygienic valve specialists Sudmo UK is introducing its range of double block and bleed butterfly leakage valves. The concept of a “leakage” butterfly process valve appears to be a contradiction in terms. However, Sudmo believes these valves offer both high mix-proof security and excellent hygiene capabilities. Complex routings in process plants demand zero product contamination and the ability to carry out frequent and rigorous cleaning routines with the minimum disruption to the process. Double block and bleed butterfly valves come with double seals, combined with the capability of being able to clean and drain the “leakage” chamber between the two butterfly discs. Integrally operated sprung loaded upper and lower poppet valves allow the chamber to be cleaned and drained without any contamination of process product. The valves are used extensively in the brewing and beverage industries, and their design ensures the safe separation of non-compatible liquids during CIP (cleaning in process) or SIP (sterilising in process) routines by means of positively controlled butterfly discs.