NIBCO Iron Gate Valves - Manual (Page 3)

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When more detailed information is required, the NIBCO 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 for the specific product needed. This information
is taken from applicable ANSI Standards.
F. CODES & REGULATIONS
A valve specified for use in compliance with the ASME Boiler and Pressure
Vessel Code, the ANSI Pressure Piping Code, government or other regulations,
is subject to any limitation of that code or regulation and to other related
applicable ANSI Standards.
G. PRODUCTION TEST PROCEDURES
Valves are pneumatically shell and seat tested at a pressure of 80 psi in
accordance with Federal Specifications and MSS SP-70 Manufacturers
Standardization Society requirements.
I. F-637 and F-639 Ductile valves – Have a Hydrostatic shell test of
440 PSI.
II. F-637 and F-639 Ductile valves – Pneumatic seat test each seat
of 80 PSI. Allowable leakage per MSS SP-70.
F-637 – Hydrostatic seat test equal to maximum service pressure
for which the valve is rated. Allowable leakage per MSS SP-70.
III. All other valves are tested in accordance with MSS SP-70.
H. PRINCIPAL DIMENSIONS
Principal dimensions of the valve are specified in the appropriate catalog 5-100.
1.3 DETAILED
DESCRIPTION
The gate valves listed above and covered in these guidelines are ductile iron, cast iron,
alloy iron, bolted bonnet, outside screw and yoke - rising stem and inside screw - non
rising stem valve types. The valve is operated with the handwheel. They are used to
start or stop the flow of fluids in piping system. Clockwise rotation of the handwheel
closes the valve. These valves should be used in the full on or full off position only.