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GL 40 Hygienic Engineering of Valves in Process Lines for Dry Particulate Materials
First Edition, October 2010 - This Guideline describes in detail the hygienic requirements of butterfly valves, slide gate valves and ball segment valves. It also briefly mentions pinch-off valves, ball and plug valves as well as cone valves. The hygienic design requirements of rotary and diverter valves are subject of separate EHEDG Documents (Doc. 38 and 41).
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Dry Materials Handling
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Guidelines/Papers in progress