RESILIENT-SEATED CARTRIDGE STYLE
FNW7XX
BUTTERFLY VALVE
INSTALLATION INSTRUCTIONS
FNW.COM
We reserve the right to modify or improve the designs or
specifications of our products at any time without notice.
12
BOTTOM PLUG SIZE & RECOMMENDED TIGHTENING TORQUE
Size of Valve
Plug Size
Length of Plug
Recommended
Torque (ft/lb)
2"–3"
7/8" 9UNC
15mm
80
4"
1" 8UNC
15mm
120
5"–6"
1-1/8" 7UNC
15mm
200
8"
1-1/4" 7UNC
15mm
260
10"–14"
1-1/2" 6UNC
15mm
440
16"
2" 4UNC
25mm
1180
1 1. PRECAUTIONS BEFORE DISASSEMBLING THE VALVE FROM THE LINE
•
Fluid flowing in a pipe could be corrosive, toxic, flammable or contaminated. Before removing valve, inspect that no pressure is present
in line, either upstream or downstream of the valve. Be sure the line is depressurized and drained.
•
Be sure of the pipe line and media. Proper care should be taken for protection against toxic and/or flammable fluids.
•
Never remove the operator from the valve while the valve is in the pipeline under pressure.
•
Following safety precautions are recommended when repairing the valve.
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Always wear protective glasses or eye shields.
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Always wear gloves and protective footwear.
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Ensure easy availability of running water.
-
Have ready an adequate fire extinguisher if media is flammable.
1 2. REMOVAL OF VALVE FROM PIPING
•
Check to confirm piping has been depressurized and drained.
•
Actuate valve until in full closed position.
•
Attach appropriate lifting strap or sling to valve neck. Attach other end of strap or sling to secure point weight capable of
supporting valve.
•
Shut almost completely the disc. Remove all nuts and all bolts with the exception of the two lowest sustaining the valve.
•
Spread the flanges with proper tools and remove valve to substitute seat and disc. (Do not use the valve to spread flanges, because
seat damage might be the result.)