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.
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Before installing the valve, inspect the piping and remove all dirt, welding slag, rust and scale from the piping and flange faces that
could cause leakage. It is advisable to install a strainer upstream of the valve to prevent contamination from entering the valve. It is very
important for long trouble-free service to keep the valve free of all contamination that may damage the sealing surface.
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Ensure that the pipe line and mating flanges are properly aligned. Align the primary side pipe with the secondary side pipe properly
and make sure the pipes are parallel and there is no distortion. If the alignment is not proper, external leakage, seat leakage or faulty
operation may occur.
Properly Aligned
O
Poor Centering Alignment of the Pipe
X
Poor Parallel Alignment
X
Distortion
X
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When installing, do not stand on the valve or insert the valve by forcing or heating it. Allow at least 6–10 mm extra space above the
valve face-to-face dimension when installing valve between flanges for proper clearance to avoid damage to seat.
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Heating or welding of pipe shall not be done while the valve is installed as the heat may transfer to the valve, causing damage to the
body or seat.
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When installing the valve, actuator facing upward is preferred. Note stem direction carefully when installing at a pump outlet, at an
elbow or reducer or when combining a control valve and stop valve. See illustration on next page.