NIBCO Iron Gate Valves - Manual (Page 8)

NIBCO Technical Services • Phone: 1.888.446.4224 • Fax: 1.888.336.4224
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5.0 MAINTENANCE
5.1 TOOLS AND EQUIPMENT
Standard wrenches and tools are suitable for servicing valves as follows:
A. For removing bonnet-body nuts and bolts a full set of 1/2” and 3/4” drive sockets is
normally used. Pipe wrenches used on nuts or bolts have a definite crushing action
which will deform them and is not recommended.
B. A standard packing tool can be used and/or a blunt hook is sometimes used to
remove packing rings. A screwdriver to raise the packing gland (if it is in the fully
down position) and generally combination box – open end wrenches are used to
tighten the packing nuts.
C. Combination oil stone and flat plate glass course with fine 400 grit sandpaper to
polish the wedge. Flat plates to check high spots on flat surfaces such as bonnet,
seal surface and wedge in conjunction with machinist blueing.
D. Punches, hammer, pliers, files, wire brush, putty knife, chalk and other tools
generally contained in a good set of mechanics tools will be needed for things like
cleaning up the gasket surfaces, removing pins from stem-wedge connections, etc.
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 is 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 heat numbers, part
numbers, and date code numbers which are generally cast into the valve body on its
side. Designs have had modifications over the years which could render the parts
useless if they are of a different configuration, so proper identification is very important.
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.