NIBCO Technical Services • Phone: 1.888.446.4226 • Fax: 1.888.336.4226
8
B. Use flat plate glass with 400 grit sandpaper to polish the disc or bonnet sealing surface
of body. Machinist blueing should be used to test for high spots on body seats and
disc.
6.0 SPARE PARTS
Normal spare parts to be maintained on hand are listed on the NIBCO spare parts list.
If the bonnet or body are damaged it is normally less expensive to remove the entire valve
from the line and install a new one.
When placing an order for spare parts, it is necessary to give the size, the valve figure
number found on the aluminum identification plate and also the serial letter which is cast
into the valve body on its side. This will be an alphabetical letter, A, B, C, D, etc. It is vital
to give the serial letter because over a period of time the valve designs have had
modifications which could render the parts useless if they are of a different letter series.
7.0 MAJOR REPAIRS
For other repairs or replacements not covered in the above description, contact the
Technical Services Department of NIBCO INC. for special instructions. Always give the
figure number and size shown on the identification plate affixed to the valve along with the
general serial letter.
8.0 Chemical Compatibility
Please consult the most current edition of the NIBCO Chem-Guide for recommendations
regarding chemical compatibility of material exposure to specific 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.
9.0 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 influence 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 Dielectric Products Relative to Electrolysis and Galvanic Corrosion.
For any technical enquiries please call NIBCO Technical Services.
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