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Different Types Of Butterfly Valves

Butterfly valves can be classified in various ways, and different types of butterfly valves have their own characteristics, each suitable for different applications. In this blog post, we will explore the classification of butterfly valves from various perspectives.

Operation Type Of Butterfly Valves

  1. Manual Butterfly Valves
    1.1 Handle
    1.2 Hand Wheel
    1.3 Worm Gear
  2. Electric Actuator Butterfly Valves
  3. Pneumatic Actuator Butterfly Valves
  4. Hydraulic Actuator Butterfly Valves

Butterfly Valve Structure

1. Concentric Line Butterfly Valve

Cast Steel CF8 12” 150LB WAFER Concentric Line Resilient Butterfly Valve

Cast Steel CF8 12” 150LB WAFER Concentric Line Resilient Butterfly Valve

  • Features: The valve shaft axis aligns with the Concentric Line of fluid flow, and the disc rotates around the Concentric Line.
  • Applications: Suitable for general industrial applications with less stringent sealing requirements.

2. Single Offset Butterfly Valve

  • Features: The valve shaft axis and the seat axis have a certain eccentricity, offset on one side of the fluid flow.
  • Applications: Suitable for medium-pressure and temperature conditions, with higher sealing requirements in industrial pipeline systems.

3. Double Offset Butterfly Valve

Cast Steel CF8M 24” 600LB RF Flange Double Offset Butterfly Valve

Cast Steel CF8M 24” 600LB RF Flange Double Offset Butterfly Valve

  • Features: Introduces a second eccentricity on top of a single eccentric design, with both the seat and stem axes having a certain eccentricity, enhancing sealing performance.
  • Applications: Suitable for high-pressure, high-temperature applications with stringent sealing requirements in industries such as petroleum and chemicals.

4. Triple Offset Butterfly Valve

Cast Steel CF8M DN1800 PN16 RF Flange

Cast Steel CF8M DN1800 PN16 RF Flange Triple Offset Metal-To-Metal Butterfly Valve With Pneumatic Actuator and Manual Hydraulic Operation

  • Features: Introduces a third eccentricity, forming an eccentric conical surface when closed, improving both sealing and wear resistance.
  • Applications: Suitable for industrial environments with extremely high demands on sealing and wear resistance, such as chemical, petroleum, and natural gas industries.

Seat Material Of Butterfly Valves

1.Soft-Sealed Butterfly Valve

1.1 Non-metallic to Non-metallic Seal Pairing

  • Features: Typically, the sealing surfaces consist of two non-metallic, soft materials, such as rubber-to-rubber or PTFE -to- PTFE. This design offers good elasticity and sealing for general medium and medium-to-low pressure and temperature conditions.
  • Applications: Suitable for situations with less demanding medium requirements and some elasticity.

1.2 Metallic to Non-metallic Seal Pairing

  • Features: This configuration combines metal and non-metallic soft materials. The metal provides strength and stability, while the soft material contributes to good sealing. This design strikes a balance between strength and sealing performance.
  • Applications: Suitable for medium temperature and pressure conditions with some corrosive medium requirements.

2. Metal-Hard Sealed Butterfly Valve:

2.1 Metal to Metal Seal Pairing

  • Features: This type uses hard metal materials for both sealing surfaces, such as stainless steel to stainless steel, aluminum alloy to aluminum alloy, or hard alloys. This design offers high hardness and corrosion resistance, suitable for high-temperature, high-pressure, and corrosive media.
  • Applications: Suitable for demanding conditions requiring high sealing performance and durability, as seen in chemical, petroleum, and natural gas industries.

Seal Type Of Butterfly Valves

1. Forcibly Sealed Butterfly Valve

1.1 Elastic Seal Butterfly Valve

When the valve is closed, the disc exerts pressure on the seat, creating a sealing compression ratio, utilizing the elasticity of the seat or disc.

  • Features: Sealing is achieved through the elasticity of the disc and seat, suitable for applications requiring good elasticity.

1.2 Externally Torqued Seal Butterfly Valve

The sealing compression ratio is generated by externally applying torque to the valve shaft.

  • Features: Sealing is accomplished by applying external torque to the valve shaft, suitable for situations requiring external power assistance.

2. Pressure-Filled Seal Butterfly Valve

The sealing compression ratio is generated by the elastic sealing element on the seat or disc being filled with pressure.

  • Features: Sealing is achieved by the elastic sealing element being pressurized on the seat or disc, suitable for situations requiring assistance from elastic elements.

3. Automatically Sealed Butterfly Valve

The sealing compression ratio is automatically generated by the pressure of the medium.

  • Features: Sealing is automatically achieved through the pressure of the medium, without external assistance, suitable for automatic sealing scenarios.

These butterfly valves with different sealing mechanisms have their respective advantages and disadvantages under different operating conditions. Choosing the appropriate seal type based on specific usage scenarios and requirements is crucial to ensure the normal operation and safe use of butterfly valves.

Connection Of Butterfly Valves

1. Wafer Connection Butterfly Valve

Wafer Connection butterfly valves are clamped between two pipe flanges using sealing gaskets to ensure a proper seal.

  • Features: Installation and disassembly are simple.
  • Applications: Suitable for situations requiring frequent disassembly and replacement.
wafer connection butterfly valves

2. Flange Connection Butterfly Valve

Flange connection involves bolting the valve’s flange to the pipe flange using bolts and sealing gaskets for proper sealing.

  • Features: Convenient installation and disassembly, stable structure, applicable to a wide range of sizes and pressures.
  • Applications: Suitable for high-pressure, high-temperature, and large-diameter pipeline systems, commonly found in industrial pipelines and equipment.

3. Welded Connection Butterfly Valve

Welded connection involves directly welding the butterfly valve to the pipeline, forming a sealed connection.

  • Features: Simple structure, no need for bolts and gaskets, reducing the risk of leakage. Suitable for various pressures and temperatures. Difficult to disassemble.
  • Applications: Suitable for applications requiring excellent sealing, infrequent disassembly, often used in long-term reliable operation of pipeline systems, or in harsh conditions such as power plants, nuclear engineering, and ethylene projects.

4. Threaded Connection Butterfly Valve

Butterfly valve ports have threads and can be directly connected to the pipeline threads.

  • Features: Typically used in small-diameter (< DN50) pipelines with non-hazardous fluids, relatively easy installation.
  • Applications: Common in small butterfly valves, suitable for low-pressure, small-diameter pipelines.

5. Lug Connection Butterfly Valve

The butterfly valve is connected to the pipeline through the lugs on the valve body using bolts.

  • Features: Simple structure, easy installation.
  • Applications: Typically used in low-pressure and small-diameter systems.
Lug Connection Butterfly Valves

6. Grooved Connection Butterfly Valve

The valve body and pipe connection have identical circular grooves, connected using groove connectors.

  • Features: Relatively simple installation and maintenance, suitable for easily installed and replaced situations.
  • Applications: Mainly used in pipeline systems in industrial and commercial buildings, such as fire protection systems.

Working Pressure Of Butterfly Valves

  1. Vacuum Type: Working pressures lower than standard atmospheric pressure
  2. Low-Pressure Type: PN <1.6Mpa.
  3. Medium-Pressure Type: PN is 2.5 – 6.4Mpa.
  4. High-Pressure Type: PN is 10.0 – 80.0Mpa.
  5. Ultra-High-Pressure Type: PN>100MPa.

Working Temperature Of Butterfly Valves

  1. High-Temperature Type: t>450℃ .
  2. Medium-Temperature Type: 120℃<t<450℃.
  3. Normal Temperature Type: 40℃<t<120℃.
  4. Low-Temperature Type: 100<t<40℃.
  5. Ultra-Low-Temperature Type: t<100℃.

Different butterfly valves have their advantages and disadvantages under various operating conditions. Choosing the appropriate type of butterfly valve based on specific usage scenarios and requirements is crucial for ensuring the normal operation and safe use of the butterfly valve.

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