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|Doc 20 - Hygienic design and safe use of double-seat mixproof valves (2000)|
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Today, food process plants incorporate various multifunctional flow paths. Often one piping system is cleaned while another still contains product. This simultaneous cleaning can potentially result in the dangerous situation where product and cleaning liquid are separated by just one single valve seat. Any cleaning liquid that leaks across such a seat will contaminate the product. Therefore, often two or three single seat valves in a "block-and-bleed" arrangement are applied. Single-body double-seat butterfly valves are used as well, but these cannot be guaranteed to be mix-proof.
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