Tanggong Valve Group is a leading valve manufacturer with over 30 years of experience. We specialize in gate valves, globe valves, check valves, ball valves, butterfly valves, forged steel valves, high-temperature valves, and more. Our products are designed and manufactured according to international standards including API, ASTM, ANSI, JIS, and CE.
With advanced production facilities, a modern R&D center, and a highly skilled workforce, we ensure the highest quality in all our products. We hold multiple certifications, including ISO9001, ISO14001, and CE, ensuring quality and reliability. Our valves serve a wide range of industries such as oil & gas, chemical, power generation, and construction, and are trusted by customers in over 20 countries.
A triple offset butterfly valve is a high-performance valve designed to provide a tight seal in demanding applications. Unlike traditional butterfly valves, it features a unique geometry that ensures a metal-to-metal seal without friction during operation. This design results in enhanced sealing performance, reduced wear, and increased durability, making it ideal for high-pressure and high-temperature environments.
Triple offset butterfly valves are engineered with precision to ensure optimal performance in demanding industrial applications. The primary components include:
Disc: The disc is the primary flow control element, typically constructed from stainless steel or other corrosion-resistant alloys to withstand harsh operating conditions.
Seat: The seat provides the sealing surface, often made from materials like Stellite® grade 21, a cobalt alloy known for its hardness and resistance to wear and corrosion.
Stem: The stem connects the actuator to the disc, transmitting the rotational force. Materials such as 17-4PH stainless steel or 410 stainless steel are commonly used for their strength and durability.
Body: The valve body houses all internal components and is typically made from carbon steel or stainless steel, selected based on the application’s pressure and temperature requirements.
The “triple offset” design refers to three distinct offsets in the valve’s geometry:
First Offset: The shaft centerline is offset from the valve body centerline, allowing for a continuous seat path.
Second Offset: The shaft is offset to one side of the pipe/valve centerline, enabling the seal to move away from the seat during the 90° opening.
Third Offset: The seat and seal cone centerlines are inclined relative to the pipe/valve centerline, creating a conical sealing surface. This design ensures that the disc and seat engage without rubbing, reducing wear and extending valve life.
(For more detailed insights on the differences between double offset and triple offset butterfly valves, check out our here.)
The selection of materials for triple offset butterfly valves is crucial to ensure performance and longevity:
Stainless Steel: Commonly used for components like the disc and stem due to its excellent corrosion resistance and strength.
Inconel: An alloy known for its high-temperature strength and oxidation resistance, suitable for valves operating in extreme conditions.
Resilient Seats: Some triple offset valves utilize resilient seats made from materials like TFM 1600 to provide a tight seal and accommodate minor misalignments.
Triple offset butterfly valves operate by using a unique geometry that provides exceptional sealing capabilities and minimizes wear during operation. Unlike traditional butterfly valves, which rely on a rubber seal, the triple offset design incorporates three key offsets—shaft, disc, and seat—to ensure a metal-to-metal seal. This design reduces friction and eliminates the chances of seat wear, offering long-lasting performance even in demanding environments.
In operation, the valve’s disc rotates 90 degrees to control fluid flow, and the three offsets come into play as the disc moves away from the seat. As the valve opens, the disc does not slide across the seat, which would typically lead to damage or leakage. Instead, the conical seat design and offset alignment ensure that the sealing surfaces only touch when needed, providing a leak-proof closure while reducing wear. This results in a valve that delivers a tight seal, even in high-pressure and high-temperature applications.
Triple offset butterfly valves are engineered to provide a bubble-tight seal, effectively preventing any leakage when closed. This capability is particularly crucial in industries where the containment of hazardous materials is necessary, ensuring safety and compliance with stringent environmental standards.
Designed to withstand extreme operating conditions, triple offset butterfly valves maintain their integrity and performance in high-pressure and high-temperature environments. This resilience makes them ideal for applications in sectors such as oil and gas, chemical processing, and power generation, where equipment is subjected to demanding conditions.
The unique design of triple offset butterfly valves minimizes friction between sealing surfaces, leading to reduced wear and extended service life. This frictionless operation not only enhances the valve’s durability but also results in lower maintenance requirements, reducing downtime and operational costs.
Selecting a triple offset butterfly valve with appropriate pressure and temperature ratings is crucial to ensure safe and efficient operation. The valve must withstand the maximum operating pressure and temperature of your system without compromising performance or safety. For instance, in high-pressure applications, valves constructed from materials like stainless steel or Inconel are preferred due to their superior strength and resistance to thermal expansion.
The valve’s materials must be compatible with the fluids it will control. For corrosive media, materials such as Hastelloy or Monel offer excellent resistance to chemical attack. In applications involving abrasive fluids, hard-faced seats or coatings can enhance durability and extend the valve’s service life. It’s essential to assess the chemical composition and abrasiveness of the media to select suitable materials that prevent degradation and ensure reliable operation.
Ensuring that the triple offset butterfly valve complies with relevant international standards is vital for quality assurance and regulatory compliance. Standards such as API (American Petroleum Institute), ISO (International Organization for Standardization), and ASME (American Society of Mechanical Engineers) provide guidelines on design, materials, testing, and performance. Adherence to these standards guarantees that the valve meets industry-specific requirements and performs reliably under specified conditions.
Yes, triple offset butterfly valves are designed to operate effectively in cryogenic conditions. For instance, the Masoneilan 33000 Series is specifically engineered for LNG cryogenic applications, maintaining zero leakage performance at temperatures as low as -196°C.
Triple offset butterfly valves are well-suited for throttling applications. Their unique design allows for precise flow control with minimal friction, making them ideal for regulating flow in various industrial processes.
Triple offset butterfly valves are inherently fire-safe due to their metal-to-metal sealing design. They are often fire-tested and certified to standards such as API 607 and ISO 10497, ensuring reliable performance even in fire conditions.
In summary, triple offset butterfly valves offer significant advantages in industrial applications, including zero leakage performance, durability in high-pressure and high-temperature environments, and reduced maintenance due to their frictionless operation. These features enhance operational efficiency and safety across various industries. If you’re seeking tailored valve solutions to meet your specific requirements, please contact us to discuss how we can assist you.
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