Second Edition, July 2025 - This Guideline highlights the hygienic design and the safe use of mixproof valves. The document describes the different design details and the feature and benefits of the mixproof valves. This document will give you an idea of why Mixproof (MP) Technology was developed in the 1960s and has continued to be developed until the present day. Detailed knowledge of the design and functionality is highlighted. The advantages of mixproof valves are described to support end users with their risk assessment and in the selection of mixproof valves. It combines the knowledge of the related valve industry in a concise way.