Pentair F251, F250 Installation & Maintenance Instructions Manual

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.

Pentair reserves the right to change the contents without notice page 3

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.