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Hygienic butterfly valves model F250 & F251
Installation & Maintenance Instructions
3 Safety
Prevent that, during maintenance, liquids can pressurize the pipe work in which the valve has been
installed.
Prevent that fingers get jammed between disc and seat during operation of a disconnected valve.
During cleaning at elevated temperatures, the butterfly valve can be so hot that touching the
surface causes burning.
4 Transport and storage
The butterfly valve is packed in a box. This prevents dust and dirt entering the valve interior.
The quality of the seat and flange seal may deteriorate during long-term storage.
5 Installation instructions
5.1 Mounting
The butterfly valves are bi-directional and there is no need to identify upstream and downstream
orientation.
Handle operated valves have stop plates with either dual or multiple positions and provide visual
indication of the valve position, by either the handle being inline with the disc or by the flats on the
bottom of the disc stem where the flats are in line with the disc.
5.2 Installation into pipework
The butterfly valve can be welded in every position in the pipe work.
Remove the seals, disc and bearings before welding.
6 Cleaning and maintenance
6.1 Cleaning
The butterfly valve material is resistant to detergents that are commonly used in the food industry,
such as a lye (NAOH) or acid (HNO 3 ) solution of about 2% at a temperature of about 80°C. After
cleaning, the system must be rinsed with clean water to prevent corrosion.
6.2 Lead-time
Routine maintenance is not normally necessary.
Only routine checks to ensure all fasteners are tight and that valve is leak free are required.
For special applications (such as highly viscous or crystallizing liquids) the lead-time must be
adjusted in consultation with the manufacturer.
6.3 Safety measures during maintenance
When disassembling the butterfly valve, the pipe work must be empty. With disassembled valves,
it must be prevented that the pipe work can be filled accidentally by, e.g. starting a pump or
activating a valve.
6.4 Grease to be used
Ensure before assembling that all parts are clean and in good condition. Lubricate moving contact
surfaces of disc stem, seat and seal(s) with a food grade FDA approved lubricant.
6.5 Disassembling the butterfly valve
(See appendix B)
A
- Locate handle 6 in closed position.
B
- Remove plug 10 from top of handle 6.
C
- Remove handle screw 9 and spring washer 7.
D
- Remove handle 6 and notch plate 5.
E
- Remove body screws 10 and nuts 11.
F
- Remove disc and seat assembly.
Take care not to loose the upper and lower bearings 4 located on either side of the disc stem.
G
- Remove upper and lower bearings 4.
H
- Rotate disc 3 to the open position and stretch seat 2 over bottom of disc stem (short end), then
remove seat from disc along the upper disc stem.
Pentair reserves the right to change the contents without notice
page 2
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