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KEYSTONE
www.pentair.com/valves
Hygienic butterfly valves model F250 & F251
Installation & Maintenance Instructions
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Contents
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2.1
2.2.
2.3.
3.
4.
5.
5.1.
5.2.
6.
6.1.
6.2.
6.3.
6.4.
6.5.
6.6.
6.7.
6.8.
6.9.
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.
Pentair reserves the right to change the contents without notice
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EBPJV-0765-EN-1305
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Summary of Contents for Pentair F251
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Page 1: Table Of Contents
Actuator mounting 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. -
Page 2: Safety
- 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... -
Page 3: Disassembling The Wafer Style Butterfly Valve
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. Pentair reserves the right to change the contents without notice page 3... -
Page 4: Appendix A - Technical Specifications
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 Pentair reserves the right to change the contents without notice page 4... -
Page 5: Appendix B - Assembly Drawing F250 & F251
- The part ref. no. Notch plate W. Nr. 1.4301 - The quality of the seat. Handle Polymer or W. Nr. 1.4301 Spring washer Handle screw Plug Nylon Body screw Pentair reserves the right to change the contents without notice page 5... -
Page 6: Appendix C - Assembly Drawing F250 & F251 Wafer Style
Handle Polymer or W. Nr. 1.4301 Spring washer Handle screw Plug Nylon Bolt Jacking stud Flange W. Nr. 1.4404 Flange seal VMQ, EPDM, NBR or FPM Body screw Pentair reserves the right to change the contents without notice page 6... -
Page 7: Appendix D - Actuator F257
- Torque up the two screws 20 according to torque values table: Valve size Torque (Nm) 25 – 65 80 – 100 - Cycle test actuator to ensure correct operation. Pentair reserves the right to change the contents without notice page 7...