Butterfly valve BF 31 PIETRO FIORENTINI Vietnam

Introducing Butterfly Valve BF 31 PIETRO FIORENTINI Vietnam

Butterfly valve  BF 31  is a blocking device that can ensure low pressure loss. It can also be used to block fluids where a tight seal, low pressure loss and compact construction in the flow direction are required.

Butterfly valve BF 31 Suitable for use with natural gas and previously filtered non-corrosive gases, it is mainly used in medium and low pressure gas distribution networks.

Characteristics of butterfly valve BF 31 PIETRO FIORENTINI Vietnam

  • Design pressure: up to 19 bar (ANSI 150)
  • Design temperature: from -10 °C to +150 °C (VITON), from -10 °C to +100 °C (NITRILE)
  • Nominal size: up to 24"
  • Flange: ANSI 150 according to ASME B16.5 and PN 16 according to EN 1092
  • Dimensions from end to end: according to UNI 11354, ISO 5752, MSSSP 67, BS 5155-74

Technical specifications Butterfly valve BF 31 PIETRO FIORENTINI Vietnam

Structure of Butterfly Valve BF 31 PIETRO FIORENTINI Vietnam

Body: Is the outermost part of the valve, usually made from materials such as cast iron, steel, or plastic, helping to protect the internal parts.

Valve disc (Disc): Is the main part that opens or closes the flow. This disc can be made from stainless steel, cast iron, or plastic, depending on the specific application.

Valve stem (Stem): Connects the valve disc to the control part (lever or actuator), allowing the position of the valve disc to be adjusted.

Seat: Usually made from rubber, PTFE or other heat-resistant materials, it helps ensure a seal between the valve disc and valve body when the valve is closed.

Controller (Actuator): Can be a lever, crank or electric/pneumatic actuator, used to adjust the position of the valve disc.


Body P355NH EN10028-3
Butterfly ASTM A516 Gr.70 + ENG (25 μm)
Stem X16CrNi16-2 EN10088-3 (AISI 431)
Fixing screws for sealing ring X5CrNi18-10 EN10088-3 (AISI 304)
Sleeve Self-lubricating sleeve

Maximum working pressure DN 300 ÷ 600 16 bar (UNI PN16)
DN 300 ÷ 600 19 bar (ANSI 150 RF)
Working temperature According to the sealing ring (see relevant tab.).
Fluids Water, gas, compressed air, hydrocarbons
Nominal dimensions DN DN 300 ÷ 600
Flanged connections UNI PN16; class ANSI 150 RF


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