A triple offset butterfly valve is a high-performance isolation valve designed for applications where conventional resilient-seated or double offset butterfly valves cannot meet pressure, temperature, or leakage requirements. By using a three-offset sealing design, the valve achieves a metal-to-metal sealing mechanism with reduced friction between the disc and seat during operation, making it suitable for demanding services such as oil and gas, petrochemical, power generation, LNG, steam, and industrial process systems.   Triple Offset Butterfly Valve Design and Working Principle   Unlike a concentric butterfly valve, where the shaft is positioned at the centerline of the disc and seat, a triple offset butterfly valve incorporates three independent geometric offsets. The first offset moves the shaft away from the centerline of the valve body, the second offset shifts the shaft from the pipeline centerline, and the third offset introduces a conical sealing surface instead of a circular sealing profile. This geometry allows the disc to move away from the seat immediately after rotation begins, eliminating rubbing between sealing surfaces.   The main advantage of this design is that the sealing force is generated by torque rather than continuous compression of soft materials. If the application requires high-temperature service, then a metal-seated triple offset butterfly valve is often preferred because elastomer seats may degrade under elevated temperatures. If the medium contains abrasive particles or aggressive chemicals, then material selection for the disc, seat, and body becomes critical to prevent erosion, corrosion, and leakage during long-term operation.   Triple Offset Butterfly Valve Standards and Materials   A triple offset butterfly valve is commonly manufactured according to standards such as API 609, EN 593, and ISO 5752, with pressure ratings ranging from Class 150 to Class 600 and higher depending on design requirements. Typical materials include carbon steel, stainless steel, duplex stainless steel, aluminum bronze, and nickel-based alloys. For corrosive seawater applications, aluminum bronze alloys such as C95500 or C95800 may be selected, while sour service applications may require materials compliant with NACE MR0175/ISO 15156 requirements.   Triple Offset Butterfly Valve Sealing Performance and Leakage Control   The sealing performance of a triple offset butterfly valve depends on the interaction between the sealing ring, seat surface finish, operating torque, and material compatibility. Since the sealing surfaces contact only at the final closing position, mechanical wear is significantly reduced compared with traditional butterfly valve designs. If zero leakage is required for critical isolation, then the valve design, pressure class, and applicable leakage standard, such as API 598 or ISO 5208, must be considered during specification.   Triple Offset Butterfly Valve Applications and S...

Ball valves and plug valves are both quarter-turn rotary valves used for on-off control and isolation in industrial piping systems. Although they share similar operating principles, their internal designs result in different performance characteristics, especially in terms of sealing, pressure capability, operating torque, maintenance requirements, and suitability for different media.   The selection between a ball valve and a plug valve should be based on actual operating conditions rather than valve type preference. If the application requires tight shutoff, frequent operation, and low operating torque, then a ball valve is often preferred. If the system involves dirty media, abrasive particles, or large flow passages, then a plug valve may provide better reliability.   Design Differences and Sealing Performance   A ball valve uses a spherical closure element with a drilled bore. When the valve is open, the bore aligns with the pipeline to provide a nearly unrestricted flow path. When rotated 90 degrees, the solid section of the ball blocks the passage and provides shutoff.     A plug valve uses a cylindrical or conical plug with a flow passage through the center. The plug rotates inside the body to control flow. Depending on the design, plug valves can be lubricated, sleeved, or non-lubricated, with each structure offering different sealing characteristics.   The sealing mechanism is one of the main differences between the two valves. Ball valves generally use soft seats, metal seats, or a combination of both to achieve reliable shutoff. If the system requires bubble-tight isolation, especially in gas service or critical process applications, then a properly selected ball valve can provide excellent sealing performance.   Plug valves rely on the contact between the plug and the valve body or sleeve. Lubricated plug valves use sealant injected between the plug and body to reduce friction and improve sealing. This design can perform well in applications where the media contains contaminants because the sealant helps protect the sealing surfaces.   Application Considerations   Operating conditions determine whether a ball valve or plug valve is more suitable.   Ball valves are widely used in oil and gas, petrochemical, LNG, chemical processing, and power industries where reliable shutoff is required. Floating ball valves are commonly applied in lower pressure systems, while trunnion mounted ball valves are preferred for larger sizes and higher pressure ratings because the trunnion support reduces operating torque.   If the valve will experience frequent cycling, then a ball valve usually provides an advantage due to its low friction operation and quarter-turn actuation. However, careful consideration is required when handling fluids containing solid particles. If abrasive particles become trapped between the ball and seat, then seat damage and leakage may occur.   Plug valves are often s...

In 2026, DERVOS VALVE proudly celebrates its 18th anniversary, marking an important milestone in the company's journey. To commemorate this occasion, DERVOS VALVE organized a three-day anniversary celebration, bringing together all employees to reflect on the company's achievements over the past eighteen years, look ahead to future development, and further strengthen team cohesion through meaningful activities and shared experiences.   Reflecting on 18 Years of Growth   From raw material management and precision machining to assembly and product testing, every stage of production reflects DERVOS VALVE's unwavering commitment to quality.   Over the past eighteen years, DERVOS VALVE has continuously improved its manufacturing system while enhancing product quality and customer service capabilities. Today, our industrial valves are widely used across the oil and gas, chemical, power generation, water treatment, LNG, and other industrial sectors, providing reliable valve solutions to customers worldwide.   Building Consensus for Future Development     During the anniversary celebration, DERVOS VALVE also held its mid-year communication meeting.   The meeting reviewed the company's performance over the first half of the year and outlined key objectives for future development. Representatives from different departments exchanged insights on production management, quality improvement, and cross-functional collaboration, sharing practical experience, reviewing achievements, and discussing future goals together.   The meeting further strengthened communication among departments, reinforced team alignment, and injected new momentum into the company's long-term development.     Embracing Nature Together   In addition to the company's anniversary activities, DERVOS VALVE organized a group excursion to experience the beauty of nature.   Surrounded by picturesque landscapes, employees enjoyed the scenic environment and explored the local culture in a relaxed and enjoyable atmosphere. The trip provided an opportunity to unwind while fostering stronger relationships among colleagues.   This memorable experience enriched the anniversary celebration, strengthened team spirit, and inspired everyone with renewed energy for the work ahead.     Eighteen Years of Commitment, Looking Ahead   Eighteen years represent not only growth and achievement, but also the beginning of a new chapter.     Since its establishment, DERVOS VALVE has remained dedicated to the design, manufacturing, and global supply of industrial valves. Through continuous improvements in product development, manufacturing capabilities, and quality management, the company has provided reliable valve products and technical support to customers across a wide range of industries worldwide.   Looking ahead, DERVOS VALVE will continue to focus on product innovation, manufacturing excellence, and long-term...