DUCTILE IRON FLANGED GATE VALVE
FIGURE 751
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INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
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TROUBLESHOOTING
Problem
Possible Causes
Remedy
Bonnet nuts are loose
Tighten to values listed in Table 2
Leakage from
the bonnet
Bonnet sealing gasket
is damaged
Disassemble valve and install a new gasket
Bonnet flange faces
are damaged
Repair damaged area and install a new gasket
Valve is not properly seated
Check with hand wheel to see if the valve is tightly closed
Leakage past
the seat
There is an obstruction
between the seat and disc
Open and close the valve a couple times
to see if the obstruction clears
Disc is damaged or worn
Disassemble the valve, inspect
internal components, and repair or replace as required
INSPECTION
Valve components are subject to normal wear and
tear and must be inspected and replaced as needed.
The frequency of inspection and maintenance depends on the severity
of the conditions of use.
Table 2
Tightening values
Size
Torque-Bolts between
bonnet and body (NM)
2.5"
65
3"
70
4"
70
6"
80
8"
100
10"
100