Pentair F251 Installation and operating instructions

KEYSTONE
Hygienic butterfly valves model F250 & F251
Installation & Maintenance Instructions
Pentair reserves the right to change the contents without notice EBPJV-0765-EN-1305
1 Contents
1 Contents 1
2 Introduction 1
2.1 Valve use 1
2.2. Application area 1
2.3. Incorrect use 1
3. Safety 2
4. Transport and storage 2
5. Installation instructions 2
5.1. Mounting 2
5.2. Installation into pipe work 2
6. Cleaning and maintenance 2
6.1. Cleaning 2
6.2. Lead-time 2
6.3. Safety measures during maintenance 2
6.4. Grease to be used 2
6.5. Disassembling the butterfly valve 2
6.6. Disassembling the wafer style butterfly valve 3
6.7. Assembling the butterfly valve 3
6.8. Assembling the wafer style butterfly valve 3
6.9. Failures 3
Appendix A - Technical specifications 4
Butterfly valve ordering code 4
Butterfly valve material 4
Seat and flange seal material 4
Liquid operating pressure 4
Operating temperature 4
Air supply actuator F257 4
Appendix B - Assembly drawing F250 & F251 5
Parts and spare parts 5
Ordering (spare) parts 5
Appendix C - Assembly drawing F250 & F251 wafer style 6
Parts and spare parts 6
Ordering (spare) parts 6
Appendix D - Actuator F257 7
Mounting parts 7
Actuator mounting 7
2 Introduction
2.1 Valve use
The Keystone F250 and F251 hygienic butterfly valves are universal valves for manual or automated
isolation and control.
2.2 Application area
The butterfly valve has been designed for use in the food & beverage, pharmaceutical and light
chemical industries.
2.3 Incorrect use
The butterfly valve is not suitable for use in gas systems.
Liquids with hard solid parts cause increased wear to the seat.
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Hygienic butterfly valves model F250 & F251
Installation & Maintenance Instructions
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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 (HNO3) 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.

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Hygienic butterfly valves model F250 & F251
Installation & Maintenance Instructions
6.9 Failures
Leakage along the disc stem or between the body halves 1.
Check seat 2.
Check product pressure (must be below 10 bar).
Leakage between body halves 1 and flanges 14 (butterfly valve wafer style).
Check flange seals 15.
Water hammer during closing.
Increase the closing time.
6.7 Assembling the butterfly valve
(See appendix B)
A - Stretch seat 2 over bottom of disc stem (short end), then place seat from disc along the upper
stem and rotate disc 3 to the open position
B - Place upper and lower bearings 4
C - Place disc and seat assembly between body halves 1.
D - Fit body screws 10 and nuts 11, tighten to recommended torques.
Valves DN 25 to DN 65 = 14 Nm, DN 80 to DN 150 = 19 Nm.
E - Fit notch plate 5 over the disc stem and locate lugs on notch plate in body.
F - Fit handle 6 to the disc stem so that the handle is parallel to the disc.
G - Fit the handle screw 8, spring washer 7 and plug 9.
H - As the valve is already installed in the pipeline use the position indicator on the valves bottom
stem to ensure the valve disc is in the desired position (flats are in line with disc).
I - Cycle test the valve and inspect for leakage at plant start up.
6.8 Assembling the wafer style butterfly valve
(See appendix C)
A - Stretch seat 2 over bottom of disc stem (short end), then place seat on disc along the upper
stem and rotate disc 3 to the open position
B - Place upper and lower bearings 4
C - Place disc and seat assembly between body halves 1.
D - Fit body screws 16 and nuts 17, tighten to recommended torque’s.
Valves DN 25 to DN 65 = 14 Nm, DN 80 to DN 150 = 19 Nm.
E - Place flange seals 15.
F - Place the valve between the flanges 14.
G - Wind two of the inside nuts 13 back against the body halves 1.
H - Fit body screws 10 and nuts 11 and outer nuts 13.
I - Fit notch plate 5 over the disc stem and locate lugs on notch plate in body.
J - Fit handle 6 to the disc stem so that the handle is parallel to the disc
K - Fit the handle screw 8, spring washer 7 and plug 9.
L - As the valve is already installed in the pipeline use the position indicator on the valves bottom
stem to ensure the valve disc is in the desired position (flats are in line with disc).
M - Cycle test the valve and inspect for leakage at plant start up.
6.6 Disassembling the wafer style butterfly valve
(See appendix C)
A - Locate handle 6 in closed position.
B - Loosen and remove bolts 10 and nuts 11.
C - Wind two of the inside nuts 13 back against the flanges 14 to clamp the flange between the
inner and outer nuts on each of the studs 12.
D - Loosen the outer nuts 13 on flange 14 (approx. 3-4 mm).
E - Wind the two remaining inside nuts 13 back against flange 14 to clamp and separate the flanges
with the jacking studs 12.
F - Remove the valve from between the flanges 14.
G - Remove flange seals 15.
H - Remove plug 9 from top of handle 6.
I - Remove handle screw 8 and spring washer 7.
J - Remove handle 6 and notch plate 5.
K - Remove body screws 16 and nuts 17.
L - Separate body halves 1.
M - Remove disc stem 3 and seat 2 assembly.
Take care not to loose the upper and lower bearings 4 located on either side of the disc stem.
N - Remove upper and lower bearings 4.
O - 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 stem.

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Hygienic butterfly valves model F250 & F251
Appendix A - Technical specification
Butterfly valve ordering code
- F250 for imperial tubing (inch sizes)
- F251 for metric tubing (mm sizes)
Butterfly valve material
All metal parts that come into contact with the liquid are made of stainless steel according to W.
Nr. 1.4404. The other metal parts are made of stainless steel W. Nr. 1.4301. The bearings are made
of POM.
Seat and flange seal material
The seat can be made of: VMQ (white) - FDA
EPDM (black) - FDA
NBR (black) - FDA
FPM (red)
The flange seal (butterfly valve wafer style) is made of EPDM - FDA. Alternatives are available.
Liquid operating pressure
The maximum liquid operating pressure is 10 bar, the minimum is full vacuum, both at 20°C.
Operating temperature
Butterfly valves with standard seat and flange seal can resist temperatures between minus 10 and
95°C.
Air supply actuator F 257
Double acting: 3 - 8 bar
Spring return: 5.5 - 8 bar

67,8,9
5
10
11
3
2
1 4 1
A - B A - C
B
C
A
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Hygienic butterfly valves model F250 & F251
Appendix B - Assembly drawing F250 & 251
Parts and spare parts
Ref. No. Qty. Description Material Spare part
1 2 Body half W. Nr. 1.4404
2 1 Seat VMQ, EPDM, NBR or FPM X
3 1 Disc W. Nr. 1.4404
4 2 Bearing POM X
5 1 Notch plate W. Nr. 1.4301
6 1 Handle Polymer or W. Nr. 1.4301
7 1 Spring washer A2
8 1 Handle screw A2
9 1 Plug Nylon
10 4/6 Body screw A2
11 4/6 Nut A2
Ordering (spare) parts
When ordering spare parts, please include the
following information:
- The butterfly valve ordering code.
See appendix A.
- The size of the butterfly valve.
- The part ref. no.
- The quality of the seat.

67, 8, 9
5
10
16
15
14
13
11
17
3
2
15 14 1 41 12 13
A - B A - C
B
C
A
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Hygienic butterfly valves model F250 & F251
Appendix C - Assembly drawing F250 & 251 Wafer Style
Parts and spare parts
Ref. No. Qty. Description Material Spare part
1 2 Body half W. Nr. 1.4404
2 1 Seat VMQ, EPDM, NBR or FPM X
3 1 Disc W. Nr. 1.4404
4 2 Bearing POM X
5 1 Notch plate W. Nr. 1.4301
6 1 Handle Polymer or W. Nr. 1.4301
7 1 Spring washer A2
8 1 Handle screw A2
9 1 Plug Nylon
10 4/6 Bolt A2
11 4/6 Nut A2
12 2 Jacking stud A2
13 4 Nut A2
14 2 Flange W. Nr. 1.4404
15 2 Flange seal VMQ, EPDM, NBR or FPM
16 2 Body screw A2
17 2 Nut A2
Ordering (spare) parts
When ordering spare parts, please include the
following information:
- The butterfly valve ordering code.
See appendix A.
- The size of the butterfly valve.
- The part ref. no.
- The quality of the seat or flange seal.

18
19
20
21
25 – 65 14
80 – 100 18
125 22
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Mounting parts
Ref. No. Qty. Description Material
18 1 Drive boss W. Nr. 1.4301
19 2 Bridge clamp W. Nr. 1.4301
20 2 Screw A2
21 2 Spring washer A2
Actuator mounting
A - When installing a double acting or spring to close actuator, put the valve in the closed
position. When installing a spring to open actuator, put the valve in the open position. The
bottom of the disc stem is marked to indicate open or closed position.
B - Remove handle if fitted, see 6.5
C - Fit drive boss 18 onto the valve stem square so that the actuator will be correctly orientated.
D - Position the actuator onto the valve/drive boss.
E - Introduce the two bridge clamps 19 and move the actuator until all the locating pins engage
in their respective holes in the actuator base and valve.
F - While holding the bridge clamps 19 together with one hand, screw in the two screws 20 with
spring washers 21 finger tight.
G - Torque up the two screws 20 according to torque values table:
H - Cycle test actuator to ensure correct operation.
Valve size Torque (Nm)
Hygienic butterfly valves model F250 & F251
Appendix D - Actuator F257