Buying Guide

104
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Engineering Data
Index
Valve Terms and Piping Symbols ................................................105
Properties of Valve Materials .............................................. 106-109
Flow Data Cv Values for Valves ............................................. 110-111
Reference Specifications ......................................................112
Marine Applications ..........................................................113
Temperature Limits of Materials ................................................114
Valve Installation Tips ........................................................115
Flange Dimensions ....................................................... 116-117
Steam Tables ...............................................................118
Bronze Value Figure Number Comparisons ........................................119
Iron Valve Figure Number Comparisons ..........................................120
Warranty ...................................................................122
Chemical Compatibility
Please consult the most current edition of the NIBCO Chem-Guide for recommendations regarding chemical compatibility of material exposure
to specic media and media-treatment additives. The NIBCO Chem-Guide is a general guide on the topic of chemical compatibility and is by no
means an exhaustive resource on the subject. Ultimately, proper material selection is the responsibility of the installer and/or end-user, taking
into account all aspects of a system’s design and intended use.
Galvanic Potential in Piping Systems
Galvanic corrosion or dissimilar metal corrosion is an electrochemical process that is created through the electrical interaction of two different
metals under the inuence of a conductive media (i.e. an electrolyte). An electrolytic cell, much like a battery, is generated by these dissimilar
metals using water as the electrolyte. The electrical charge, developed within the electrolytic cell, drives a preferential attack on the more
electrically active metal with the water acting as the recipient of the discarded metal ions. Such galvanic attack is often encountered in service
where iron or steel components are installed, and later corrode, in a largely copper piping system. Please consult NIBCO Technical Bulletin
NTB-0714-01 Dielectric Products Relative to Electrolysis and Galvanic Corrosion.