DUCTILE IRON FLANGED GATE VALVE
FIGURE 751
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INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
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FREQUENT INSPECTION
Frequent inspections are recommended for safe, uninterrupted operation of the valve. Frequent inspections should include:
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Inspect packing gland areas, flange connections, bonnet flanges, threaded areas, body surfaces and any media fluid leakage.
Packing gland, flange and bonnet flange leaks should be handled as described in the maintenance section.
For leaks through the valve body surface, consult a valve repair specialist.
•
Listen for abnormal noise from the valve, loose bolts or pipe vibration. With frequent inspection, familiarity can better distinguish
abnormal noise from normal noise. Loose bolts should be tightened immediately. Unusual noise or piping vibration should be brought
to the attention of the piping engineer.
•
Visually confirm the correct operating position of the valve, whether the bolts are firm, and whether the valve stem has sufficient
lubrication. The valve should be operated in the fully open or fully closed position as described in the operation section.
Intermediate positioning is not recommended. If necessary, immediately tighten any loose bolts and grease around the valve stem.
PERIODIC INSPECTION
Valves should be inspected periodically to detect wear on the stem, stem nut, internal corrosion of the valve body or bonnet, and wear
on the packing. Typically, packing and gaskets are replaced during periodic inspections as part of a basic maintenance program. Periodic
inspections should include the following, which are described in more detail in the maintenance section:
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Valve disassembly
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Examination of valve components
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Component repair and/or replacement
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Valve reassembly
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Test and inspections
MAINTENANCE
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.
WARNING
To avoid personal injury or property damage due to fluid leakage, before performing any maintenance do the following:
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Shut off the pipeline.
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Completely isolate the valve from the piping.
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Release process pressure.
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Drain the process fluid from the valve.
PRELIMINARY
Before removing from the pipe, mark the edges of the valve and pipe flange so that the valve can be returned to its original position.
If multiple valves are to be inspected and they are not already marked, number the valves and flanges separately for proper matching
during maintenance.