Decoding The Distinction: Double Flanged Butterfly Valve VS. Lug Type Butterfly Valves

Decoding The Distinction: Double Flanged Butterfly Valve VS. Lug Type Butterfly Valves

May 7, 2024 | News

TWT, a renowned China butterfly valves factory, manufactures high-quality butterfly valves with precision, durability, and reliable performance. This article explores butterfly valves, focusing on double flanged and lug types. TWT highlights the features and differences between these valves, showcasing their unique characteristics and applications. Join us to learn how TWT ensures top-quality products for diverse industrial needs.

lug type butterfly valve

Understanding Double Flanged Butterfly Valves

A double flange butterfly valve is a versatile valve designed for regulating or isolating the flow of fluids in a piping system. It consists of a disc or plate that rotates on a central axis to control the flow, offering a tight shut-off when closed. Here are some key features and advantages of TWT’s double flanged butterfly valve:

  • Robust Construction: TWT constructs double flanged butterfly valves with high-quality materials, ensuring durability and long-lasting performance under high pressure and temperature conditions.
  • Double Flange Design: Install double flanged butterfly valves easily between pipeline flanges, which provide secure, leak-free connections to maintain system integrity.
  • Bi-Directional Flow: Use double flanged butterfly valves for bi-directional flow, making them ideal for applications with varying flow directions.
  • Efficient Flow Control: Achieve efficient flow control with the streamlined disc design, which minimizes flow restriction and reduces energy consumption.

Understanding Lug Type Butterfly Valves

A lug butterfly valve, like the double flanged butterfly valve, is used for regulating or isolating fluid flow. It features threaded inserts or lugs on each side of the valve body, allowing for easy installation and removal from the pipeline. Here are some key features and advantages of TWT’s lug type butterfly valve:

  • Versatile Installation: Install and remove lug type butterfly valves easily using bolts and nuts on each lug, ideal for frequent maintenance or replacement.
  • Bi-Directional Flow: Use lug type butterfly valves for bi-directional flow, similar to double flanged valves, ensuring versatility in fluid control applications.
  • Secure Sealing: Secure the valve and pipeline connection with lugs on the valve body, providing leak-free operation and maintaining system integrity.
  • Cost-Effective Solution: Choose lug type butterfly valves for cost-effective solutions, especially in applications where budget constraints are important.

Key Differences Between Wafer and Lug Butterfly Valves

  • Mounting Method: The distinction between wafer vs lug butterfly valve primarily lies in their mounting methods. A wafer type is sandwiched between two pipe flanges, secured by bolts passing through the entire assembly. In contrast, a lug butterfly valve features threaded inserts or lugs on its outer circumference, allowing it to be bolted directly to a single flange.
  • Installation Flexibility: Lug valves can be installed individually into a piping system, which means they can be used as an end-of-line valve. Wafer valves require adjacent flanges for installation, limiting their positioning flexibility within a pipeline.

  • Sealing Performance: Generally, lug butterfly valves offer better sealing performance due to their ability to withstand higher pressure differentials without distortion, thanks to their robust mounting design.

Here Are Some Common Sizes For Flanged Butterfly Valves:

Wafer Butterfly Valve Dimensions:

  • DN50 (2 inches): 120 mm (4.72 inches) x 120 mm (4.72 inches)
  • DN65 (2.5 inches): 150 mm (5.9 inches) x 150 mm (5.9 inches)
  • DN80 (3 inches): 180 mm (7.09 inches) x 180 mm (7.09 inches)
  • DN100 (4 inches): 220 mm (8.66 inches) x 220 mm (8.66 inches)
  • DN125 (5 inches): 280 mm (11.02 inches) x 280 mm (11.02 inches)
  • DN150 (6 inches): 330 mm (12.99 inches) x 330 mm (12.99 inches)
  • DN200 (8 inches): 400 mm (15.75 inches) x 400 mm (15.75 inches)

Wafer Butterfly Valve

Lugged Butterfly Valve Dimensions:

  • DN50 (2 inches): 140 mm (5.51 inches) x 140 mm (5.51 inches)
  • DN65 (2.5 inches): 170 mm (6.69 inches) x 170 mm (6.69 inches)
  • DN80 (3 inches): 200 mm (7.87 inches) x 200 mm (7.87 inches)
  • DN100 (4 inches): 240 mm (9.45 inches) x 240 mm (9.45 inches)
  • DN125 (5 inches): 300 mm (11.81 inches) x 300 mm (11.81 inches)
  • DN150 (6 inches): 360 mm (14.17 inches) x 360 mm (14.17 inches)
  • DN200 (8 inches): 420 mm (16.54 inches) x 420 mm (16.54 inches)

Flanged Butterfly Valve Dimensions (ANSI):

  • 2 inches: 6.38 inches x 6.38 inches
  • 2.5 inches: 7.5 inches x 7.5 inches
  • 3 inches: 8.5 inches x 8.5 inches
  • 4 inches: 10.5 inches x 10.5 inches
  • 5 inches: 12.5 inches x 12.5 inches
  • 6 inches: 14.5 inches x 14.5 inches
  • 8 inches: 17.5 inches x 17.5 inches

Flanged Butterfly Valve Dimensions (DIN):

  • DN50 (2 inches): 130 mm (5.12 inches) x 130 mm (5.12 inches)
  • DN65 (2.5 inches): 160 mm (6.3 inches) x 160 mm (6.3 inches)
  • DN80 (3 inches): 190 mm (7.48 inches) x 190 mm (7.48 inches)
  • DN100 (4 inches): 230 mm (9.06 inches) x 230 mm (9.06 inches)
  • DN125 (5 inches): 280 mm (11.02 inches) x 280 mm (11.02 inches)
  • DN150 (6 inches): 330 mm (12.99 inches) x 330 mm (12.99 inches)
  • DN200 (8 inches): 400 mm (15.75 inches) x 400 mm (15.75 inches)

Double Flanged Butterfly Valve vs. Lug Type Butterfly Valve

While both butterfly valve double flanged and lug type butterfly valves serve similar purposes, they differ in their design and installation methods. Here are the key distinctions between the two:

  • Installation: Install double flanged butterfly valves between pipeline flanges, securing them with bolts and nuts. Use lugs or threaded inserts to install lug type butterfly valves easily.
  • Maintenance: Remove lug type butterfly valves easily for maintenance or replacement, thanks to their lug design. Service double flanged butterfly valves by removing them between pipeline flanges.
  • Cost: Choose lug type butterfly valves for cost-effective solutions, especially in budget-constrained applications, while double flanged butterfly valves offer robust performance at higher costs.

double flange butterfly valve

TWT, a leading China butterfly valves factory, manufactures high-quality butterfly valves, including double flanged and lug types. Understand their features to choose suitable options for applications. Contact TWT to explore our butterfly valve range and experience their reliable performance. Our sales representatives provide detailed information, including double flanged butterfly valve dimensions.