Different Types of Butterfly Valves: Center Line, U-Type And Extension Stem

Oct 26, 2023 | News

Butterfly valves are widely used in various industries and applications due to their versatility, reliability, and cost-effectiveness. Among the different types available, center line butterfly valves, U-type butterfly valves, and extension stem butterfly valves stand out for their unique features and functionalities. In this blog post, we will delve into each type, exploring their characteristics, applications, and advantages, to help you understand their suitability for different scenarios and make informed choices when selecting butterfly valves for your specific needs.

Center Line Butterfly Valve

Center line butterfly valves are one of the most common and widely used types of butterfly valves. Here are the key features and benefits:

  • Design and Operation: Center line butterfly valves have a disc that rotates around a central shaft, allowing for efficient control of flow. They are typically operated by a lever or gear, which enables easy on/off operation and precise flow regulation.
  • Cost-Effective Solution: Center line butterfly valves offer a cost-effective option compared to other valve types. Their simple design and fewer components result in lower manufacturing and maintenance costs, making them an attractive choice for various applications.
  • Versatility and Wide Range of Applications: These valves are suitable for a broad range of industries and applications, including water treatment, HVAC systems, chemical processing, and food and beverage industries. They can handle both low-pressure and high-pressure applications, providing reliable flow control.
  • Space-Efficient Design: Center line butterfly valves have a compact design, requiring less space for installation compared to other valve types. This makes them particularly advantageous in applications where space is limited or where a compact valve layout is desired.

U-Type Butterfly Valve

U type butterfly valves, also known as double-offset butterfly valves, offer enhanced sealing capabilities and improved performance compared to center line butterfly valves. Here’s what sets them apart:

  • Offset Design: U-type butterfly valves have an offset design, where the centerline of the shaft is located behind the centerline of the sealing element (disc). This design reduces friction and wear, resulting in improved sealing performance and longer valve life.
  • High-Performance Sealing: The offset design of U-type butterfly valves allows for a tighter seal between the disc and the valve seat, minimizing leakage and ensuring reliable shut-off capabilities. This makes them suitable for applications that require tight sealing, such as oil and gas, chemical, and petrochemical industries.
  • Temperature and Pressure Resistance: U-type butterfly valves are engineered to withstand high temperatures and pressures. They are often equipped with materials and seals capable of handling demanding operating conditions, making them suitable for critical applications.
  • Reduced Torque and Energy Consumption: The offset design of U-type butterfly valves reduces the torque required to operate the valve, resulting in energy savings and lower operational costs. This makes them an energy-efficient choice for applications where frequent valve operation is required.

Extension Stem Butterfly Valve

Extension stem butterfly valves, also known as high-performance butterfly valves, are designed to meet the demands of critical applications that require tight shut-off, high-pressure resistance, and extended service life. Consider the following features:

  • Extended Stem Design: Extension stem butterfly valves feature a shaft extension beyond the valve body, allowing for the attachment of additional components, such as gear operators or actuator systems. This design facilitates remote operation and provides flexibility in valve control.
  • High-Pressure Capability: These valves are specifically designed to handle high-pressure applications, making them suitable for industries such as oil and gas, power generation, and chemical processing. They are engineered to withstand the elevated forces and pressures associated with demanding operating conditions.
  • Enhanced Sealing Performance: Extension stem butterfly valves are equipped with advanced sealing mechanisms, such as metal-to-metal or fire-safe seals, to ensure reliable sealing and prevent leakage. This makes them suitable for critical applications where safety and environmental concerns are paramount.
  • Long Service Life: The robust construction and high-quality materials of extension stem butterfly valves contribute to their extended service life. They are designed to withstand frequent cycling, harsh environments, and corrosive fluids, reducing maintenance requirements and downtime.