Trusted Lug Type Butterfly Valve Manufacturer

NTVAL provides durable Lug Type Butterfly Valves designed for reliable performance in tough industrial applications. Built to handle various pressure and temperature ranges, they are perfect for large-scale projects. Choose NTVAL for valves that meet your needs and boost system efficiency.

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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.

Lug Type Butterfly Valve 7

Difference Between a Lugged Butterfly Valve and a Wafer Butterfly Valve

Lugged and wafer butterfly valves are both commonly used in various piping systems, but they have distinct differences that make them suitable for different applications. Below are the key differences between these types of valves:
Cost
  • 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.
Installation
  • 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.
Operation
  • 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.
Maintenance
  • 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

Body 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.
Disc Materials
  • 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

Installing a lug-type butterfly valve is a relatively simple process, but it requires attention to detail to ensure a proper seal and long-lasting performance. Here’s how it works:

01

Valve and Pipe Setup

Start by positioning the valve between the pipes where it will be installed. The valve body has threaded inserts (or “lugs”) around its perimeter. These lugs allow the valve to be bolted directly to the flanges on either side, without the need for nuts on the other end.

02

Flange Installation

Once the valve is in place, flanges are installed on both sides of the valve. It’s important to install the flanges carefully to avoid squeezing the valve body’s sealing surfaces with the bolts. Proper alignment is crucial to maintain a good seal and to ensure the longevity of the valve.

03

Bolt Sizing and Installation

The bolts used with lug-type butterfly valves are typically smaller than those used with other types of valves. Smaller bolts are less likely to cause leaks and are easier to handle. Before installation, the correct bolt length is calculated based on the thickness of the valve, flanges, and any gaskets.

04

Securing the Valve

After determining the correct bolt length, remove one of the nuts on each bolt and thread the bolts through the flange holes into the valve’s lugs. If the valve has holes, the bolts will pass entirely through the valve, making it easy to align everything correctly. Once all bolts are in place, tighten the nuts on the other end to create a clamping force that holds the valve securely in place.

05

Final Tightening

The final step is to evenly tighten the bolts in a crisscross pattern. This helps to distribute the clamping force evenly, preventing any misalignment or damage to the valve or flanges.
 
Overall, installing a lug-type butterfly valve is a straightforward process, especially when following these steps carefully. The design of the valve allows for easy installation and maintenance, making it a popular choice in various industries.

Lug Type Butterfly Valve Application

Lug-type butterfly valves are versatile and widely used across various industries due to their durability and ease of use. Below are some common applications where these valves are essential:
 
  • 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

Lug-type butterfly valves offer several benefits, making them a popular choice in various applications:
 
  • 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

Lug Type Butterfly Valve 8
  • Material: Cast Steel Butterfly Valve
  • Type: Wafer Lug Type, Metal Seating
  • Standard: Designed to ASME B16.34
Face to FaceAPI 609 (Wafer)
End FlangeASME B16.5
Wafer EndsAPI 609/ MISS-SP-68 ISO 5752
ClassASME CL150~CL600

CLASS 150 DIMENSIONS

  

FLANGE DIMENSION

     

MOUNTING BASE

SIZE
(in.)

L

C

h

a

n1

h1

H

H1

H2

D2

L1

TYPE

C1

n

h2

W.T(kg)
Unit:mm

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
(in.)

L

C

h

a

n1

h1

H

H1

H2

D2

L1

TYPE

C1

n

h2

W.T(kg)
Unit:mm

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
(in.)

L

C

h

a

n1

h1

H

H1

H2

D2

L1

TYPE

C1

n

h2

W.T(kg)
Unit:mm

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

This valve is constructed using high-grade ductile iron or stainless steel. These materials provide excellent resistance to corrosion and wear, making them ideal for various industrial applications. The material selection also provides excellent strength, allowing the valve to operate reliably under high-pressure conditions.
These valves are designed to handle various pressure ratings, often ranging from 150 PSI to 300 PSI. The pressure rating indicates the maximum pressure the valve can withstand while maintaining its structural integrity, making it suitable for different industrial applications requiring reliable pressure management.
The Lug Type Butterfly Valve has a lug-style end connection, allowing it to be bolted directly between flanges. Here’s the interesting part, this design makes it possible to remove one side of the piping without disturbing the other, offering ease of maintenance. The lug-style connection also provides a secure and reliable fit within the pipeline.
Lug Type Butterfly Valve 9

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

Lug Type Butterfly Valves are frequently employed in the oil and gas industry to control the flow of crude oil, natural gas, and other hydrocarbons. I am impressed by their ability to withstand high pressures and harsh environmental conditions that make them suitable for upstream, midstream, and downstream operations, providing safe and efficient fluid management.

Pulp and Paper Industry

In the pulp and paper industry, these valves are used to regulate the flow of water, chemicals, and pulp. Their durable design and reliable performance are essential for maintaining consistent operation in processes such as bleaching, refining, and papermaking, where precise flow control is critical. If you are in this industry and looking for high-quality Lug Type Butterfly Valve, choose NTVAL.

Chemical Processing Plants

Lug Type Butterfly Valves are widely used in chemical processing plants due to their ability to handle corrosive and abrasive fluids. Their corrosion-resistant materials and tight shutoff capability make them ideal for managing the flow of various chemicals, maintaining safe and efficient operation in demanding industrial environments.
Lug Type Butterfly Valve 10
Lug Type Butterfly Valve 11

3 Considerations When Buying Lug Type Butterfly Valve

01

1 -20°C to 200°C Temperature Range

Check that the Lug Type Butterfly Valve can operate within a temperature range of -20°C to 200°C. For example, if your system operates in environments with extreme temperatures, selecting a valve with this range is crucial to maintain reliable performance and prevent valve failure due to temperature fluctuations.

02

5-6 Weeks Average Lead Time

Confirm the lead time for ordering and receiving the valve, typically around 5-6 weeks, just like NTVAL. Did you know that knowing the lead time is important because it helps you plan your procurement and project schedules effectively, so the valve arrives when needed, preventing delays in your project timeline.

03

1,000 GPM Flow Capacity

Look for a Lug Type Butterfly Valve that can handle a flow capacity of 1,000 GPM (gallons per minute). For example, if your system requires high-volume fluid movement, selecting a valve with this capacity is important to maintain efficient flow and prevent bottlenecks in your pipeline.

FAQs of Lug Type Butterfly Valve

Yes, we provide test reports and performance data for Lug Type Butterfly Valve with a 3.1 certificate for free. We send the certificate for your approval before delivery.
These valves are certified under various international standards, including ISO9001, ISO14001, and ISO45001. These certifications confirm that the valves comply with strict quality, environmental, and safety regulations.
At NTVAL, we have a detailed quality control system that includes production, testing, and inspection stages. This process ensures the reliability, durability, and performance of our Lug Type Butterfly Valve.

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