NIBCO Check Valve Bronze Swing - Manual (Page 3)

NIBCO Technical Services • Phone: 1.888.446.4224 • Fax: 1.888.336.4224
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When more detailed information is required, the NIBCO Bronze & Iron catalog
should be referred to using the valve figure number as the guide.
D. SERVICE
When installing valves for service in corrosive media, the NIBCO Chemical
Resistance Guide may be consulted for specific data or contact can be made
with NIBCO Technical Services. It is, however, the obligation of the user to make
the ultimate decision of fitness for use.
E. PRESSURE TEMPERATURE RATINGS
Pressure and temperature ratings may be found in the Engineering section of the
latest printing of NIBCO catalog. This information is taken from applicable ANSI
Standards.
F. CODES & REGULATIONS
A valve used under the jurisdiction of the ASME boiler and pressure vessel code,
the ANSI code for pressure piping, government or other regulations, is subject to
any limitation of that code or regulation and to the applicable ANSI Standard.
G. PRODUCTION TEST PROCEDURES
Valves are pneumatically shell tested and seat tested at a pressure of 80 psi in
accordance with Federal Specifications and MSS SP-80 Manufacturers
Standardization Society requirements.
H. PRINCIPAL DIMENSIONS
Principal dimensions of the valve are specified in the appropriate catalog.
1.3 DETAILED
DESCRIPTION
The check valves listed above and covered in these instructions are bronze valves made
of ASTM B62 material for Class 125 and 150 valves and from ASTM B61 material for
Class 200 and 300 valves.
Check valves are used in systems which allow flow to move freely in the direction of the
arrow cast onto the side of the valve body, however, should flow reversal occur, the disc
in the valve will go to the closed position and not allow flow to reverse. The primary
function of a check valve is to prevent backflow.
The disc is centered over the seat in the valve by means of a hanger which is hinged by
means of a pin to the main valve body. Therefore, any movement of the disc is in a true
arc and the disc will always center itself over the seat in the valve body. On NIBCO
bronze check valves, no control of the disc can be affected from the exterior of the valve
body. Lever and weights are available only on NIBCO iron check valves.
The body and bonnet are held together by threads of the male and female type; male
threads being on the bonnet section and female threads being within the body. There