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Learn More About Lug Type Butterfly Valve
Lug-style butterfly valves feature threaded lugs on both sides of the body, allowing connection with two separate sets of bolts—one for each flange—without the need for nuts. This design enables the valve to maintain its connection even if one side of the piping system is disconnected, keeping the other side undisturbed. Made from metals like steel or ductile iron, these valves are ideal for end-of-line service, often paired with a blind flange for maintenance.
While versatile and resistant to chemicals, lug-style butterfly valves have a lower pressure rating in dead-end services. For example, a valve mounted between two flanges can handle 1000 kPa, but on a single flange, the rating drops to 520 kPa. They can also withstand temperatures up to 200°C, allowing for easy cleaning, inspection, replacement, or repair without shutting down the entire system.
Difference Between a Lugged Butterfly Valve and a Wafer Butterfly Valve
- Lugged Butterfly Valves: These valves are more expensive but provide a stronger connection. However, they can be more challenging to install and maintain.
- Wafer Butterfly Valves: These valves are less costly and lighter. They have four holes that align with pipe flanges, allowing for easy installation by clamping the valve securely between two piping flanges.
- Lugged Butterfly Valves: Made from metals like ductile iron or steel, these valves have threaded lugs on their flanges for bolt connections. They are ideal for end-of-line service applications.
- Wafer Butterfly Valves: These valves are placed between pipe flanges and use either a rubber or EPDM seat to form a strong seal. They are easier to install compared to lugged valves.
- Lugged Butterfly Valves: Feature threaded inserts (lugs) on the outside, allowing one side of the piping system to be disconnected without affecting the other side.
- Wafer Butterfly Valves: Do not have lugs and must be clamped between two piping flanges. They can be operated pneumatically or electrically and are suitable for a wide range of applications.
- Lugged Butterfly Valves: Made from durable metals like ductile iron or steel, these valves are commonly used in high-pressure applications and can be actuated electrically or pneumatically.
- Wafer Butterfly Valves: Feature four holes that align with the pipeline, clamping between two flanges. The rubber or EPDM valve seat provides an effective seal, making it easier to maintain.
Lug Type Butterfly Valve Materials
- Cast Steel: This material is strong and durable, making it suitable for high-pressure applications. It can withstand harsh environments, including extreme temperatures.
- Copper Alloys: Copper alloys are corrosion-resistant, making them ideal for use in environments where exposure to moisture or chemicals is common. They also offer good thermal conductivity.
- Stainless Steel: Stainless steel is known for its resistance to corrosion and rust. It is commonly used in industries where hygiene is important, such as food processing and pharmaceuticals.
- Ductile Cast Iron: Ductile cast iron is tough and has excellent impact resistance. It combines the strength of steel with the cost-effectiveness of cast iron.
- Bronze: Provides good corrosion resistance and durability, making it ideal for marine environments and non-corrosive fluid systems.
- Titanium: Lightweight, exceptionally strong, and resistant to corrosion, ideal for extreme conditions in chemical plants and offshore environments.
- Copper Alloy: Copper alloy discs are highly resistant to corrosion and wear, making them suitable for valves used in corrosive environments. They also have good heat and electrical conductivity.
- Cast Iron: Cast iron discs are durable and provide good wear resistance, making them a cost-effective choice for many applications. They are typically used in systems where high strength is not required.
- Cast Steel: Cast steel discs are strong and can handle high pressures and temperatures. They are ideal for industrial applications where durability is crucial.
- Stainless Steel: Stainless steel discs resist corrosion and are suitable for use in aggressive environments. They are commonly used in applications that require high cleanliness and corrosion resistance.
- Ductile Cast Iron: Ductile cast iron discs offer excellent toughness and are resistant to impact and wear. They are often used in heavy-duty applications where both strength and durability are needed.
Lug Type Butterfly Valve Installation
01
Valve and Pipe Setup
02
Flange Installation
03
Bolt Sizing and Installation
04
Securing the Valve
05
Final Tightening
Lug Type Butterfly Valve Application
- Chemical Industry: Lug-type butterfly valves are used to control the flow of chemicals in processing plants. Their resistance to corrosive substances makes them ideal for this environment.
- Oil Industry: These valves help regulate the flow of oil in pipelines and storage facilities. Their ability to handle high pressure and temperatures makes them essential in this sector.
- Food Processing: Lug-type butterfly valves are used to manage the flow of liquids and gases in food production. They are designed to meet hygiene standards and are easy to clean.
- Pharmaceutical: In pharmaceutical manufacturing, these valves control the flow of ingredients and clean water. Their design prevents contamination and maintains product purity.
- Water Industry: Lug-type butterfly valves are used to manage water flow in supply systems. They are durable and capable of handling large volumes of water.
- Wastewater Management: These valves are critical in controlling the flow of wastewater in treatment plants. They can withstand harsh conditions and corrosive materials commonly found in wastewater.
Lug Type Butterfly Valve Advantages
- Bidirectional Sealing: These valves can seal in both directions, allowing them to control the flow of fluids from either side. This makes them versatile and reliable in different piping systems.
- Lightweight: Lug-type butterfly valves are light, which makes them easy to handle and install. Their lightweight design also reduces the overall load on the piping system.
- Compact Size: These valves are small, which saves space in tight installations. Their compact size also makes them ideal for use in systems where space is limited.
- Replaceable Body Seat and Low-Pressure Drop: The seat of the valve can be easily replaced, which extends the valve’s lifespan. Additionally, they cause minimal pressure loss, allowing for efficient fluid flow.
- Easy Installation and Maintenance: Lug-type butterfly valves are simple to install and require minimal maintenance. This makes them a cost-effective choice for long-term use.
- Flexible Installation Positions: These valves can be installed in any orientation—vertical, diagonal, or horizontal. This flexibility allows for easy adaptation to different piping configurations.
- Corrosion Resistance: Built with materials that withstand harsh chemicals and environments, ensuring long-lasting performance even under challenging conditions.
Dimensions
- Material: Cast Steel Butterfly Valve
- Type: Wafer Lug Type, Metal Seating
- Standard: Designed to ASME B16.34
Face to Face | API 609 (Wafer) |
End Flange | ASME B16.5 |
Wafer Ends | API 609/ MISS-SP-68 ISO 5752 |
Class | ASME CL150~CL600 |
CLASS 150 DIMENSIONS | ||||||||||||||||
 |  | FLANGE DIMENSION |  |  |  |  |  | MOUNTING BASE | ||||||||
SIZE | L | C | h | a | n1 | h1 | H | H1 | H2 | D2 | L1 | TYPE | C1 | n | h2 | W.T(kg) |
3 | 48 | 152.4 | 5/8-11 | 15.8 | 4 | 19.1 | 282 | 258 | 142 | 200 | 165 | F07 | 70 | 4 | 9 | 23 |
4 | 54 | 190.5 | 5/8-11 | 15.8 | 8 | 19.1 | 294 | 270 | 162 | 200 | 165 | F07 | 70 | 4 | 9 | 30 |
5 | 57 | 215.9 | 3/4-10 | 19.1 | 8 | 22.2 | 319 | 295 | 170 | 200 | 165 | F07 | 70 | 4 | 9 | 36 |
6 | 57 | 241.3 | 3/4-10 | 19.1 | 8 | 22.2 | 340 | 316 | 179 | 200 | 165 | F07 | 70 | 4 | 9 | 39 |
8 | 64 | 298.4 | 3/4-10 | 19.1 | 8 | 22.2 | 384 | 344 | 208 | 300 | 270 | F10 | 102 | 4 | 11 | 59 |
10 | 71 | 341.9 | 7/8-9 | 22.2 | 12 | 25.4 | 434 | 394 | 241 | 300 | 270 | F10 | 102 | 4 | 11 | 83 |
12 | 81 | 431.8 | 7/8-9 | 22.2 | 12 | 25.4 | 520 | 470 | 267 | 400 | 335 | F14 | 140 | 4 | 18 | 110 |
14 | 92 | 476.3 | 45299 | 25.4 | 12 | 28.6 | 544 | 494 | 316 | 400 | 335 | F14 | 140 | 4 | 18 | 153 |
16 | 102 | 539.7 | 45299 | 25.4 | 16 | 28.6 | 643 | 578 | 349 | 500 | 375 | F16 | 165 | 4 | 22 | 193 |
18 | 114 | 577.8 | 1-1/8-8 | 28.6 | 16 | 31.8 | 660 | 595 | 381 | 500 | 375 | F16 | 165 | 4 | 22 | 258 |
20 | 127 | 635 | 1-1/8-8 | 28.6 | 20 | 31.8 | 695 | 630 | 412 | 500 | 375 | F16 | 165 | 4 | 22 | 318 |
24 | 154 | 749.3 | 1-1/4-8 | 31.8 | 20 | 35.1 | 813 | 743 | 473 | 600 | 485 | F25 | 254 | 8 | 18 | 507 |
CLASS 300 DIMENSIONS | ||||||||||||||||
 |  | FLANGE DIMENSION |  |  |  |  |  | MOUNTING BASE | ||||||||
SIZE | L | C | h | a | n1 | h1 | H | H1 | H2 | D2 | L1 | TYPE | C1 | n | h2 | W.T(kg) |
3 | 48 | 168.2 | 3/4-10 | 19.1 | 8 | 22.2 | 282 | 258 | 142 | 200 | 165 | F07 | 70 | 4 | 9 | 24 |
4 | 54 | 200 | 3/4-10 | 19.1 | 8 | 22.2 | 294 | 270 | 162 | 200 | 165 | F07 | 70 | 4 | 9 | 32 |
5 | 59 | 234.9 | 3/4-10 | 19.1 | 8 | 22.32 | 319 | 295 | 170 | 300 | 270 | F10 | 102 | 4 | 11 | 44 |
6 | 59 | 269.8 | 3/4-10 | 19.1 | 12 | 22.2 | 375 | 336 | 199 | 300 | 270 | F10 | 102 | 4 | 11 | 52 |
8 | 73 | 330.2 | 7/8-9 | 22 | 12 | 25.4 | 450 | 400 | 227 | 400 | 335 | F14 | 140 | 4 | 18 | 83 |
10 | 83 | 387.3 | 1-8 | 25.4 | 16 | 28.6 | 499 | 449 | 265 | 400 | 335 | F14 | 140 | 4 | 18 | 151 |
12 | 92 | 450.8 | 1-1/8-8 | 28.6 | 16 | 31.8 | 562 | 497 | 302 | 500 | 375 | F16 | 165 | 4 | 22 | 172 |
14 | 117 | 514.3 | 1-1/8-8 | 28.6 | 20 | 31.8 | 616 | 551 | 328 | 500 | 375 | F16 | 165 | 4 | 22 | 249 |
16 | 133 | 571.5 | 1-1/4-8 | 31.8 | 20 | 35.1 | 616 | 606 | 367 | 600 | 375 | F25 | 254 | 8 | 18 | 352 |
18 | 149 | 628.6 | 1-1/4-8 | 31.8 | 24 | 35.1 | 711 | 641 | 402 | 600 | 485 | F25 | 254 | 8 | 18 | 449 |
20 | 159 | 685.8 | 1-1/4-8 | 31.8 | 24 | 35.1 | 798 | 721 | 432 | 700 | 520 | F30 | 298 | 8 | 22 | 534 |
24 | 181 | 812.8 | 1-1/2-8 | 38.1 | 24 | 41.2 | 914 | 837 | 530 | 700 | 515 | F30 | 298 | 8 | 22 | 812 |
CLASS 600 DIMENSIONS | ||||||||||||||||
 |  | FLANGE DIMENSION |  |  |  |  |  | MOUNTING BASE | ||||||||
SIZE | L | C | h | a | n1 | h1 | H | H1 | H2 | D2 | L1 | TYPE | C1 | n | h2 | W.T(kg) |
3 | 54 | 168.2 | 3/4-10 | 19.1 | 4 | 22.2 | 282 | 265 | 148 | 200 | 165 | F07 | 70 | 4 | 9 | 32 |
4 | 64 | 215.9 | 718-9 | 22.2 | 4 | 25.4 | 370 | 330 | 180 | 300 | 270 | F10 | 102 | 4 | 11 | 45 |
5 | 78 | 266.7 | 1-8 | 25.4 | 4 | 28.6 | 405 | 355 | 195 | 400 | 335 | F14 | 140 | 4 | 18 | 67 |
6 | 78 | 292.1 | 1-8 | 25.4 | 8 | 28.6 | 420 | 370 | 225 | 400 | 335 | F14 | 140 | 4 | 18 | 88 |
8 | 102 | 349.2 | 1-1/8-8 | 28.6 | 8 | 31.8 | 490 | 425 | 255 | 500 | 375 | F16 | 165 | 4 | 22 | 157 |
10 | 117 | 431.8 | 1-1/4-8 | 31.8 | 12 | 35.1 | 545 | 480 | 310 | 500 | 375 | F16 | 165 | 4 | 22 | 237 |
12 | 140 | 488.9 | 1-1/4-8 | 31.8 | 16 | 35.1 | 630 | 560 | 330 | 600 | 485 | F25 | 254 | 8 | 18 | 335 |
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Specs of Lug Type Butterfly Valve
Body Material
Pressure Rating
End Connection
Features of Lug Type Butterfly Valve
Compact Design
They are known for their compact design, making them ideal for installations in tight spaces. This small footprint allows for greater flexibility in system layouts and reduces the overall space needed for valve installation. Despite their size, these valves provide efficient performance without compromising on functionality.
Tight Shutoff
A key feature of Lug Type Butterfly Valves is their ability to provide a tight shutoff, which is crucial for preventing leaks. This feature is particularly important in applications that require precise control of fluid flow, guaranteeing that the valve operates efficiently and effectively. At NTVAL, we can guarantee that our valves have this tight shutoff feature for maintaining system integrity and preventing fluid loss.
Bi-Directional Flow Capability
These valves are designed to control flow in both directions, making them versatile for various applications. This bi-directional capability allows the valve to be used in systems where fluid direction may change, providing flexibility in system design and operation. And on top of that, the ability to manage flow in both directions makes these valves highly adaptable to different operational needs.
Benefits of Lug Type Butterfly Valve
Enhanced Cost Efficiency
These valves provide enhanced cost efficiency due to their straightforward design and lower material requirements. This results in reduced manufacturing and maintenance costs, making them an economical choice for companies looking to achieve reliable performance while keeping expenses under control.
Easier and Faster Operation
Lug Type Butterfly Valves allow for easier and faster operation, with a simple quarter-turn mechanism to open or close the valve. This quick operation is advantageous in systems where rapid adjustments are necessary, leading to better control and efficiency in managing fluid flow.
Improved Flow Efficiency
The design of Lug Type Butterfly Valves promotes improved flow efficiency by minimizing pressure drop. This benefit is crucial in maintaining consistent pressure levels throughout the system, which can lead to lower energy consumption and more efficient overall operation.
Applications of Lug Type Butterfly Valve
Oil and Gas Industry
Pulp and Paper Industry
Chemical Processing Plants
3 Considerations When Buying Lug Type Butterfly Valve
01
1 -20°C to 200°C Temperature Range
02
5-6 Weeks Average Lead Time
03
1,000 GPM Flow Capacity
FAQs of Lug Type Butterfly Valve
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