This 3-A Sanitary Standard is to establish minimum sanitary (hygienic) requirements for Double-Seat Mixproof Valves. Standard English is the official language of 3-A Sanitary Standards and 3-A Accepted Practices.

This 3-A Sanitary Standard is for voluntary use by directly and materially affected organizations such as equipment and machinery fabricators, processors, regulatory agencies and by 3-A SSI to assure adequate public health protection exist for the devices and covered products. 3-A Sanitary Standards, Inc. use these documents as the source for sanitary criteria as part of 3-A Symbol authorization.