FNW FIGURE 751 Guide

DUCTILE IRON FLANGED GATE VALVE
FIGURE 751
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specifications of our products at any time without notice.
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
©2022 Ferguson Enterprises, LLC 0522 4108704
INTRODUCTION
This instruction manual provides storage, installation, operation and maintenance information for ductile iron flanged gate valves.
This manual describes PSI ductile iron valves. Valves are intended for use in water service. Do not use in steam or
hydrocarbon service.
STORAGE
Be careful not to damage the valve stem while handling. If the valves are rack mounted for storage, their packing chambers should
not be in direct contact with the rack. It is not recommended to place the valve directly on the ground or concrete floor.
TEMPORARY STORAGE
If the valve is to be temporarily stored prior to installation, the following rules should be followed:
• Always keep the valve wrapped and protected.
• It is best to store the valve in a dust-free, well-ventilated and low-humidity area.
• If stored outdoors, please ensure that the valve is protected by good environmental protection to ensure that there is no water
accumulation on or in the valve.
• The valve comes with a protective end cap to prevent mechanical damage and prevent the intrusion of dust and foreign objects.
If an end cap is found to be missing after shipping, use the appropriate type of end protector immediately.
• The valve should remain in the half-open position.
LONG TERM STORAGE
If the valve is to be stored for more than one year, it should be prepared following the rules above, as well as the following additional rules:
• Do not store the valve outdoors.
• Remove packaging and apply preservative to exposed areas of the valve.
• Do the following annually:
• Apply lubricant to exposed areas.
• Apply a protective surface coating to the outside of the valve as required. Make sure the surface area is clean before applying
the protective spray.
INSTALLATION
WARNING
To avoid personal injury or property damage due to valve leakage, do the following before installation:
• Shut off the pipeline.
• Completely isolate the valve from the piping.
• Relieve pipeline pressure.
• Drain water from the valve.
• Remove protection cover of the valve.
• Inspect the valve body ports and associated equipment for damage and any foreign objects that may have been present during
shipping or storage. Blow compressed air into the valve, making sure the inside of the valve body is clean.

DUCTILE IRON FLANGED GATE VALVE
FIGURE 751
FNW.COM We reserve the right to modify or improve the designs or
specifications of our products at any time without notice.
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
©2022 Ferguson Enterprises, LLC 0522 4108704
• Check the pipeline and supporting flange to ensure that the pipeline is
free of foreign matter, the flange is clean, and there are no burrs or pits
to avoid leakage.
• Make sure the connecting pipe has adequate support. Improper
support can lead to valve deformation, leakage, operational inefficiency
and early maintenance issues.
• When installing the gate valve, make sure that there is enough space
around the handwheel to operate the valve easily and safely, and make
sure that the valve stem has enough space to rise when the valve
is opened.
• Ensure that the bolt and gasket material are compatible with the valve
body material and pressure rating.
• With proper support, align the valve flange holes with the pipe
flange holes.
• For ring washers, insert two to four bolts into the lowest bolt holes.
• Insert a suitable gasket between the flanges and center them.
For ring spacers, use the inserted bolts to center the spacer.
• Insert and tighten all bolts and nuts. Care should be taken to ensure
that the flanges are parallel.
• Using a cross pattern (star pattern), tighten each bolt evenly to ensure
even shim loading. The ends of the tightening bolts should protrude
evenly from each nut (see Figure ).
• After the valve is installed, re-check all the bolts and nuts of the
connecting flanges and re-tighten them if they are found to be loose.
OPERATION
• Gate valves are not designed for throttling (modulating) service and should be used in the open or closed position. Prolonged use in
the partially open or closed position may result in the erosion of the wedge and/or seat. This position may also cause a “chatter” noise
in the line or cause damage to the valve.
• For gate valves, turn the hand wheel counterclockwise to open the valve. Turn the hand wheel clockwise to close the valve.
Do not use pipe extensions (cheater bars) to operate the valve as this may damage seat surfaces, yoke or stem.
• For gate valves, on a new valve or a valve that has had new packing installed, the hand wheel torque may be relatively high.
This high torque will diminish to a reasonable level after the valve has been operated several times. Hand wheel operating torque
also depends on the type and size of each valve and its position. Note that the operating torque is high when opening a fully closed
valve or when closing the valve and near the end of valve travel.
• For gate valves, sometimes material in the line can get stuck between the disc and seating area. Should this happen, re-open the
valve to allow the process fluid to clear the material. If the condition persists, it may be necessary to shut down the line and inspect
the interior of the valve.
(10
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Figure 4 Tightening pattern
Table 1 Closing torque and turns to open
2.5" 3" 4" 6" 8" 10" 12"
Closing torque ft/lbs ≤ ≤ ≤ ≤ ≤ ≤ ≤
Turn ± 0.5 ±0.5 ±0.5 .±0.5 ±0.5 ±0.5 ±0.5
300PSI UL/FM OS&Y FLANGED GATE VALVE

DUCTILE IRON FLANGED GATE VALVE
FIGURE 751
FNW.COM We reserve the right to modify or improve the designs or
specifications of our products at any time without notice.
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
©2022 Ferguson Enterprises, LLC 0522 4108704
Problem Possible Causes Remedy
Gland nuts are loose Tighten gland nuts
Leakage through
the stem packing
Gland is binding against
the stem
Check to ensure that the gland is centered
and evenly tightend
Inadequate amount of
packing rings Install additonal packing rings
Packing is hard and dry Replace with new packing
Leakage through
the stem packing
Packing was not properly
cut and staggered Replace with new packing
Stem is damaged Repair or replace as required
Stem is binding
during travel
Remove dirt and lubricate stem with grease
Hand wheel is
difficult to turn
Stem packing is exerting
excessibe force on stem
Check torque on gland nuts
Stem is damaged
Examine stem through full open and close action.
Repair or replace as required.
Internal components
may be damaged
Disassemble the valve.
Inspect and repair as needed.
TROUBLESHOOTING

DUCTILE IRON FLANGED GATE VALVE
FIGURE 751
FNW.COM We reserve the right to modify or improve the designs or
specifications of our products at any time without notice.
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
©2022 Ferguson Enterprises, LLC 0522 4108704
TROUBLESHOOTING
Problem Possible Causes Remedy
Bonnet nuts are loose Tighten to values listed in Table 
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)
." 65
" 70
" 70
" 80
" 100
" 100

DUCTILE IRON FLANGED GATE VALVE
FIGURE 751
FNW.COM We reserve the right to modify or improve the designs or
specifications of our products at any time without notice.
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
©2022 Ferguson Enterprises, LLC 0522 4108704
FREQUENT INSPECTION
Frequent inspections are recommended for safe, uninterrupted operation of the valve. Frequent inspections should include:
• 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:
• Valve disassembly
• Examination of valve components
• Component repair and/or replacement
• Valve reassembly
• 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:
• Shut off the pipeline.
• Completely isolate the valve from the piping.
• Release process pressure.
• 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.

DUCTILE IRON FLANGED GATE VALVE
FIGURE 751
FNW.COM We reserve the right to modify or improve the designs or
specifications of our products at any time without notice.
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
©2022 Ferguson Enterprises, LLC 0522 4108704
DISASSEMBLY AND ASSEMBLY
GATE VALVES
See Figure  for the following disassembly and assembly
instructions. NOTE: All gate valves may not have the same
components listed below. Refer to the corresponding valve
drawing for a parts list. These steps are after the valve has been
removed from the pipeline.
DISASSEMBLY
• Turn the handwheel () to open the valve.
• Remove the bonnet screws ().
• Mark the body () and bonnet () flanges to hold them in place
during assembly.
• Lift the bonnet (), stem () and disc () assembly out of the
body (), taking care not to scratch the disc surface.
• Remove the bonnet gasket () from the valve.
• Remove the valve plate () from the lifting nut () of the valve stem
().
• Loosen the locking screw () on the handwheel lock nut ().
Remove the handwheel lock nut () from the valve stem nut
(), and then remove the handwheel () from the valve stem
nut ().
• Loosen the nut () on the gland bolt () to release the gland
(). Turn the valve stem counterclockwise from the bottom of
the valve cover () to remove the valve stem nut (), pull out
the valve stem (), and remove the valve stem nut () from the
valve cover ().
• Remove packing () using a suitable tool.
ASSEMBLY
• Thoroughly clean the inside of the valve and all parts. Remove
any limescale, oil, grease or other foreign matter. Wipe disc ()
with a cloth. Clean body () and bonnet () inside and outside
surfaces and all nuts and bolts.
• Put packing () into the packing groove of bonnet (), align and
center the packing gland () into the packing groove, put on
the gland bolts (), tighten the nuts () by hand, and carefully
pass the valve stem () through the valve Packing hole in cap
(), gland (), until the stem thread engages with stem nut ().
Slowly rotate the valve stem female () counterclockwise until
the valve stem () protrudes from the valve stem female ()
and passes through the top of the valve cover ().
• Put the handwheel () on the valve stem nut () and fix it with the
handwheel lock nut (), then lock it with the locking screw ().
• Put a new gasket () in the groove of the top flange face of the
valve body (), the gasket can be greased with butter.
Do not reuse the gasket.


Figure 5 Disassemby and assembly
• Install the valve plate () on the lifting nut () on the valve stem
() to complete the assembly of the valve cover (), valve stem
() and valve plate () and other components.
• Slowly place the bonnet (), stem () and disc () assembly into
the body (). Pay attention to prevent the surface of the valve seat
from being scratched, align the flange of the valve cover () with
the top flange of the valve body () according to the mark made
in advance, make sure that the gasket () does not extend out of
the groove of the top flange of the valve body, and then fasten
it with screws () , when tightening the screws, do so diagonally
until tight. See recommended torque values in Table .
• Tighten the gland nuts () alternately by hand.
• Use handwheel () to open and close the valve. The action
should be smooth throughout the stroke

DUCTILE IRON FLANGED GATE VALVE
FIGURE 751
FNW.COM We reserve the right to modify or improve the designs or
specifications of our products at any time without notice.
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
©2022 Ferguson Enterprises, LLC 0522 4108704
STEM PACKING REPLACEMENT
WARNING
To avoid injury to yourself, fellow workers, or damage to property from
release of process fluids, ensure that all pressure is removed from the
valve both upstream and downstream before disassembly.
• Loosen the gland nut () and remove the gasket () and the bonnet
bolt (). Lift the gland () to tie and secure it with string or wire.
(See Figure ).
• Use a suitable tool to remove the existing packing ring (). Do not
scratch or damage the surface of the stem or packing with tools.
Next tie the loose packing rings () with string or wire
(see Figure ).
• Check that the stem and packing are intact. Any burrs and scratches
should be removed with emery cloth. Clean the valve stem with a
cloth soaked in solvent.
• Count the original number of packing rings.
• If replacing with new packing, use a sharp tool to cut each ring
at a ° angle (see Figure ), stagger adjacent packing openings
°–° into the bonnet packing groove. (See Figure ).
Tamp each ring when installing.
• After the packing groove is filled with the packing rings, reassemble
the gland, gland nuts (), washers () and bonnet bolts ().
Alternately tighten the gland nuts () one quarter turn at a time
until the gland nuts () begin to tighten.
• Open and close the valve with handwheel (). The action should be
smooth throughout the stroke. Adjust the tightness of the packing by
adjusting the gland nut. If the packing leaks, turn the gland nut ()
evenly in / turn increments until it stops.
(10
)
8. I
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.
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the packi
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
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ments until the
Figure 1 Stem packing replacement
(10
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
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Figure 2
(10
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the packi
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
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ments until the
Figure 3

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specifications of our products at any time without notice.
©2022 Ferguson Enterprises, LLC 0522 4108704
WARRANTY
Limited Warranty
Subject to the limitations expressed herein, Seller warrants that products manufactured by Seller shall be free from defects
in design, material and workmanship under normal use for a period of one () year from installation but in no case shall the
warranty period extend longer than eighteen months from the date of sale. This warranty is void for any damage caused by
misuse, abuse, neglect, acts of God or improper installation. For the purpose of this section, “Normal Use” means in strict
accordance with the installation, operation and maintenance manual. The warranty for all other products is provided by the
original equipment manufacturer.
Remedies
Seller shall repair or replace, at its option, any non-conforming or otherwise defective product, upon receipt of notice
from Buyer during the Manufacturer’s warranty period at no additional charge. SELLER HEREBY DISCLAIMS ALL
OTHER EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS OR FITNESS FOR A PARTICULAR PURPOSE.
Limitation of Liability
UNDER NO CIRCUMSTANCES SHALL EITHER PARTY BE LIABLE TO THE OTHER FOR INCIDENTAL, PUNITIVE, SPECIAL
OR CONSEQUENTIAL DAMAGES OF ANY KIND. BUYER HEREBY ACKNOWLEDGES AND AGREES THAT UNDER NO
CIRCUMSTANCES, AND IN NO EVENT, SHALL SELLER'S LIABILITY, IF ANY, EXCEED THE NET SALES PRICE OF THE
DEFECTIVE PRODUCT(S) PURCHASED DURING THE PREVIOUS CONTRACT YEAR.
Labor Allowance
Seller makes NO ADDITIONAL ALLOWANCE FOR THE LABOR OR EXPENSE OF REPAIRING OR REPLACING DEFECTIVE
PRODUCTS OR WORKMANSHIP OR DAMAGE RESULTING FROM THE SAME.
Recommendations by Seller
Seller may assist Buyer in selection decisions by providing information regarding products that it manufacturers and those
manufactured by others. However, Buyer acknowledges that Buyer ultimately chooses the product’s suitability for its
particular use, as normally signified by the signature of Buyer’s technical representative. Any recommendations made by
Seller concerning the use, design, application or operation of the products shall not be construed as representations or
warranties, expressed or implied. Failure by Seller to make recommendations or give advice to Buyer shall not impose any
liability upon Seller.
Excused Performance
Seller will make a good faith effort to complete delivery of the products as indicated by Seller in writing, but Seller assumes
no responsibility or liability and will accept no back-charge for loss or damage due to delay or inability to deliver, caused by
acts of God, war, labor difficulties, accidents, inability to obtain materials, delays of carriers, contractors or suppliers or any
other causes of any kind whatever beyond the control of Seller. Under no circumstances shall Seller be liable for any special,
consequential, incidental, or indirect damages, losses, or expense (whether or not based on negligence) arising directly or
indirectly from delays or failure to give notice of delay.
LIMITED WARRANTY
FNW.COM We reserve the right to modify or improve the designs or
specifications of our products at any time without notice.