The Ins and Outs of Double Offset Butterfly Valves: A Comprehensive Guide

Jan 6, 2024 | News

Butterfly valves are a type of quarter-turn valve that is widely used in various industries for their efficiency and versatility. One particular type of butterfly valve that has gained popularity in recent years is the double offset butterfly valve. In this blog post, we will explore the features and benefits of this valve and provide a comprehensive guide on its applications and considerations when purchasing.

What is a Double Offset Butterfly Valve?

A China double offset butterfly valve is a variation of the traditional butterfly valve, with an additional offset in the stem and disc. This offset helps to reduce the friction between the disc and the seat, allowing for a tighter seal and better control of flow. This design also makes it easier to open and close the valve, even under high pressure and temperature conditions.

Advantages of Double Offset Butterfly Valves

  • Improved Sealing Performance: The double offset design of these valves provides a tighter seal between the disc and the seat, reducing the chances of leakage. This is especially beneficial in applications where a secure seal is crucial, such as in the oil and gas industry.
  • Increased Durability and Reliability: The offset stem and disc reduce the wear and tear on the valve, making it more durable and reliable in the long run. This makes it a cost-effective choice for industries that require high-performance valves.
  • Better Control of Flow: The offset design also allows for better control of flow, making it suitable for applications that require precise regulation of flow rates. This makes it a popular choice in industries such as water treatment and chemical processing.
  • Lower Operating Torque: The offset design reduces the friction between the disc and the seat, resulting in a lower operating torque. This makes it easier to open and close the valve, even under high pressure and temperature conditions.

Applications of Double Offset Butterfly Valves

  • Oil and Gas Industry: Double offset butterfly valves from China valve supplier, are commonly used in the oil and gas industry for their durability, reliability, and tight sealing. They are suitable for a variety of applications, including transportation and distribution of oil and gas, and are also used in refineries and petrochemical plants.
  • Water Treatment: These valves are also used in water treatment plants for their precise flow control and ability to handle large volumes of water. They are suitable for use in both potable and non-potable water systems and are resistant to corrosion, making them ideal for this industry.
  • Chemical Processing: In chemical processing plants, double offset butterfly valves are used for their ability to handle corrosive and abrasive materials. They are also suitable for high-temperature and high-pressure applications, making them a preferred choice in this industry.
  • HVAC Systems: These valves are also used in heating, ventilation, and air conditioning (HVAC) systems for their precise flow control and low operating torque. They are also compatible with various types of pipes, making them easy to install and maintain.

What to Consider When Purchasing Double Offset Butterfly Valves?

When purchasing double offset butterfly valves, there are a few factors that you should keep in mind to ensure that you get the best performance and value for your money.

  • Materials of Construction: These valves are available in various materials, such as cast iron, steel, and stainless steel. It is crucial to consider the type of material based on the application and the medium that will be flowing through the valve.
  • Size and Pressure Rating: Double offset butterfly valves come in different sizes and pressure ratings, and it is important to choose the right size and rating for your specific application. This will ensure that the valve can handle the flow and pressure requirements without any issues.
  • End Connections: These valves come with various end connections, such as flanged, wafer, and lug. It is essential to choose the right end connection based on the type of piping system and the installation requirements.
  • Certification and Standards: Look for valves that have been certified by relevant authorities, such as the American Society of Mechanical Engineers (ASME), to ensure that they meet industry standards and have been tested for quality and safety.