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Published on: July 11, 2017
Assessment of the Cleanability of Air-Actuated Butterfly Valves 1
1Department of Food Science, University of Wisconsin, Madison, Wisconsin 53706.
Abstract:
Six common and commercially available 5.1-cm (2 in.) air-operated butterfly valves were fitted to a type 304 stainless steal manifold and circulation system. The system was microprocessor-controlled to simulate 3, 6 and 12 months of wear during typical processing and CIP procedures in a dairy-type application. Raw milk with added Bacillus stearothermophilus spores was diluted with water and was used as the circulation liquid. After a trial period, valves were carefully disassembled and tested microbiologically. Based on results a determination of cleanability was made. None of the valves proved to be totally cleanable without maintenance within 1 year of simulated operation. In fact, all but one valve failed within 6 months.
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