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Concentric Butterfly Valve

Concentric butterfly valves are known for their durability and reliability in demanding environments. Constructed with high-quality materials such as stainless steel, ductile iron, or carbon steel, these valves offer excellent corrosion resistance and mechanical strength. The concentric design ensures a tight seal, preventing leakage even under high-pressure conditions. This reliability makes them suitable for critical applications in industries such as oil and gas, chemical processing, and power generation. Additionally, their low maintenance requirements and long service life make them a cost-effective choice for fluid control systems.

Working Principle and Design Features

Concentric butterfly valves operate on a simple yet effective principle. The valve comprises a metal disc placed at the center of a pipe, allowing it to rotate freely within the valve body. When the valve is closed, the disc is perpendicular to the flow, effectively blocking the passage of fluid. Conversely, when the valve is open, the disc is parallel to the flow, allowing fluid to pass through with minimal obstruction.

The stem of the valve passes through the center of the disc, connecting it to the actuator. This design allows for precise control over the position of the disc, enabling smooth and efficient regulation of fluid flow. The seat, typically made from elastomers or rubber, is located within the valve body and provides a tight seal when the valve is closed.

(FOR SEAT SELECTION)

Design Features

Concentric butterfly valves are also known as centric or resilient-seated butterfly valves due to their design features. The concentric placement of the disc and the seat within the valve body ensures a reliable seal, even under low-pressure conditions. This design feature makes concentric butterfly valves particularly suitable for applications where tight shut-off is required.

The valve disc is usually made from materials such as stainless steel or ductile iron, providing excellent corrosion resistance and mechanical strength. The seat, made from elastomers or rubber, offers flexibility and resilience, ensuring a tight seal even after prolonged use.

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Dimension for Wafer, Lug, U-section, Flange

SIZE DN Φ D L N-Φ d ISO5211 Φ G
in mm A-series B-series (mm) A-series B-series
2 50 120.7 43 4 – Φ 19 F05 9 X 9
2 1/2 65 139.7 46 4 – Φ 19 F05 9 X 9
3 80 152.4 46 4 – Φ 19 F05 9 X 9
4 100 190.5 52 8 – Φ 19 F07 11 X 11
5 125 215.9 56 8 – Φ 22 F07 14 X 14
6 150 241.3 56 8 – Φ 22 F07 14 X 14
8 200 298.5 60 8 – Φ 22 F10 17 X 17
10 250 362 68 12 – Φ 25 F10 22 X 22
12 300 431.8 78 12 – Φ 25 F10 22 X 22
14 350 476.3 78 12 – Φ 29 F10 22 X 22
16 400 539.8 102 16 – Φ 29 F14
18 450 577.9 114 16 – Φ 32 F14
20 500 635 127 20 – Φ 32 F14
24 600 749.3 154 20 – Φ 35 F16
28 700 863.6 795.3 165 28 – Φ 35 40 – Φ 22 F25
32 800 977.9 900.1 190 28- Φ 41 48 – Φ 22 F25
36 900 1085.8 1009.6 203 32 – Φ 41 44 – Φ 25 F25
40 1000 1200.2 1120.8 216 36 – Φ 41 44 – Φ 29 F25
48 1200 1422.4 1335.1 254 44 – Φ 41 44 – Φ 32 F30

(Wafer)

SIZE DN Φ D L N – NUC C Φ G
in mm A-series B-series mm A-series B-series
2 50 120.7 43 4 – 5/8″ <11> F05 9 X 9
2 1/2 65 139.7 46 4 – 5/8″ <11> F05 9 X 9
3 80 152.4 46 4 – 5/8″ <11> F05 9 X 9
4 100 190.5 52 8 – 5/8″ <11> F07 11 X 11
5 125 215.9 56 8 – 3/4″ <10> F07 14 X 14
6 150 241.3 56 8 – 3/4″ <10> F07 14 X 14
8 200 298.5 60 8 – 3/4″ <10> F10 17 X 17
10 250 362 68 12 – 7/8″ <9> F10 22 X 22
12 300 431.8 78 12 – 7/8″ <9> F10 22 X 22
14 350 476.3 78 12 – 1″ <8> F10 22 X 22
16 400 539.8 102 16 – 1″ <8> F14
18 450 577.9 114 16 – 1 1/8″ F14
20 500 635 127 20 – 1 1/8″ F14
24 600 749.3 154 20 – 1 1/4″ F16
28 700 863.6 795.3 165 28 – 1 1/4″ 40 – 3/4″ <10> F25
32 800 977.9 900.1 190 28 –  1 1/2″ 48 – 3/4″ <10> F25
36 900 1085.8 1009.6 203 32 – 1 1/2″ 44 – 7/8″ <9> F25
40 1000 1200.2 1120.8 216 36 –  1 1/2″ 44 – 1″ <8> F25
48 1200 1422.4 1335.1 254 44 –  1 1/4″ 44 – 1 1/8″ F30

(Lug)

SIZE DN Φ D Φ D1 b (mm) L N-Φ d C Φ G
in mm A-series B-series A-series B-series A-series B-series (mm) A-series B-series
2 50 150 120.7 17.5 43 4 – Φ 19 F05 9 X 9
2 1/2 65 180 139.7 20.7 46 4 – Φ 19 F05 9 X 9
3 80 190 152.4 22.3 46 4 – Φ 19 F05 9 X 9
4 100 230 190.5 22.3 52 8 – Φ 19 F07 11 X 11
5 125 255 215.9 22.3 56 8 – Φ 22 F07 14 X 14
6 150 280 241.3 23.9 56 8 – Φ 22 F07 14 X 14
8 200 345 298.5 27 60 8 – Φ 22 F10 17 X 17
10 250 405 362 28.6 68 12 – Φ 25 F10 22 X 22
12 300 485 431.8 30.2 78 12 – Φ 25 F10 22 X 22
14 350 535 476.3 35.4 78 12 – Φ 29 F10 22 X 22
16 400 595 539.8 37 102 16 – Φ 29 F14
18 450 635 577.9 40.1 114 16 – Φ 32 F14
20 500 700 635 43.3 127 20 – Φ 32 F14
24 600 815 749.3 48.1 154 20 – Φ 35 F16
28 700 925 835 863.6 795.3 69.9 44.5 165 28 – Φ 35 40 – Φ 22 F25
32 800 1060 940 977.9 900.1 79.4 46 190 28- Φ 41 48 – Φ 22 F25
36 900 1170 1055 1085.8 1009.6 88.9 52.5 203 32 – Φ 41 44 – Φ 25 F25
40 1000 1290 1175 1200.2 1120.8 88.9 56 216 36 – Φ 41 44 – Φ 29 F25
48 1200 1510 1390 1422.4 1335.1 106.4 65.5 254 44 – Φ 41 44 – Φ 32 F30

(U-Section)

SIZE DN Φ D Φ D1 b (mm) f1 L N-Φ d C Φ G
in mm A-series B-series A-series B-series A-series B-series (mm) (mm) A-series B-series
2 50 150 120.7 17.5 2 108 4 – Φ 19 F05 9 X 9
2 1/2 65 180 139.7 20.7 2 112 4 – Φ 19 F05 9 X 9
3 80 190 152.4 22.3 2 114 4 – Φ 19 F05 9 X 9
4 100 230 190.5 22.3 2 127 8 – Φ 19 F07 11 X 11
5 125 255 215.9 22.3 2 140 8 – Φ 22 F07 14 X 14
6 150 280 241.3 23.9 2 140 8 – Φ 22 F07 14 X 14
8 200 345 298.5 27 2 152 8 – Φ 22 F10 17 X 17
10 250 405 362 28.6 2 165 12 – Φ 25 F10 22 X 22
12 300 485 431.8 30.2 2 178 12 – Φ 25 F10 22 X 22
14 350 535 476.3 35.4 2 190 12 – Φ 29 F10 22 X 22
16 400 595 539.8 37 2 216 16 – Φ 29 F14
18 450 635 577.9 40.1 2 222 16 – Φ 32 F14
20 500 700 635 43.3 2 229 20 – Φ 32 F14
24 600 815 749.3 48.1 2 267 20 – Φ 35 F16
28 700 925 835 863.6 795.3 69.9 44.5 2 292 28 – Φ 35 40 – Φ 22 F25
32 800 1060 940 977.9 900.1 79.4 46 2 318 28- Φ 41 48 – Φ 22 F25
36 900 1170 1055 1085.8 1009.6 88.9 52.5 2 330 32 – Φ 41 44 – Φ 25 F25
40 1000 1290 1175 1200.2 1120.8 88.9 56 2 410 36 – Φ 41 44 – Φ 29 F25
48 1200 1510 390 1422.4 1335.1 106.4 65.5 2 470 44 – Φ 41 44 – Φ 32 F30

(Flange)

Advantages

Concentric butterfly valve offers several advantages over other types of valves, including:

  • Simplicity: The simple design of concentric butterfly valves makes them easy to install and operate.
  • Cost-Effectiveness: Concentric butterfly valves are relatively inexpensive compared to other types of valves, making them a cost-effective choice for many applications.
  • Efficiency: The streamlined design of concentric butterfly valves allows for high flow capacity with minimal pressure drop, ensuring efficient fluid control.
  • Reliability: The concentric placement of the disc and seat ensures a reliable seal, even under low-pressure conditions.

Maintenance Considerations

To ensure the optimal performance and longevity of concentric butterfly valves, regular maintenance is essential. This includes:

  • Inspecting the Valve: Regularly inspect the valve for signs of wear and tear, such as corrosion or damage to the disc or seat.
  • Lubrication: Ensure that the valve is properly lubricated to prevent friction and ensure smooth operation.
  • Replacing Seals: If the seals show signs of wear or damage, they should be replaced promptly to maintain a tight seal.

Conclusion

Concentric butterfly valves are essential components in fluid control systems, offering efficient and reliable performance in a wide range of applications. Their simple yet effective design, combined with their versatility and cost-effectiveness, makes them a popular choice for many industries. By understanding the working principles, design features, practical applications, advantages, and maintenance considerations of concentric butterfly valves, you can make informed decisions regarding their use in your specific application.