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A triple-offset butterfly valve has three different offsets (balancing effects). The first offset relates to the location of the shaft in reference to the centerlines of the bore. The second offset is in the design of the seat cone angle. The geometrical design of the sealing components makes up the third offset. Each sealing component has an offset conical profile that results in a right-angled cone because of the way it was machined. This guarantees friction-free stroking throughout the whole cycle of operation. The disc seat does not over-travel since contact is only made at the very last moment of closing, with the 90-degree angle serving as a mechanical stop. Read More…
Triple Offset Butterfly ValvesTriple offset butterfly valves are mechanisms that control the flow of fluids in pipes while being eccentric in three places. Butterfly valves consist of a seal around the wall of a pipe, a round or elliptical disc and a control lever.
Butterfly Valves & Controls, Inc. has been a premier supplier of quality butterfly control valves and other related industrial components for 25 years. We carry only the best parts sourced from world-class butterfly valve manufacturers. Extended service life and safe operation are at the core of every valve manufactured/assembled. Our catalog includes a large selection of valves, actuators, controls, positioners, and more.
MDC Vacuum Products manufactures vacuum components. Our butterfly valves are low outgassing. The Del-Seal™ mini butterfly valves have a stainless steel internal surface, aluminum handle, metal seal or elastomer O-ring seal flange. Our Kwik-Flange butterfly valves are ISO KF flanges. Seal kits are available.
Score Valves manufactures the TRICENTRIC® Triple Offset Metal Seated Butterfly valves, sizes 3"-72" ANSI CL 150-600#. The Score-TRICENTRIC® Valve is built to exacting standards and designs, with a proven history in oil and gas, petrochemical, refinery, pulp and paper.
Stayflow Strainers & Valves is a leader in the butterfly valves industry. We have a variety of products to fit the needs of multiple industries. This includes our baseline series, high-performance series, and PTFE-lined high-performance series. Stayflow Strainers & Valves pride ourselves on our high-quality products and knowledgeable industry experts.
Deconstruction of the Triple-Offset (Butterfly) Valve/TOV
These three offsets work together to produce a continuous sealing surface, reduce wear between the seat and seal, and maintain sealing integrity throughout the valve's lifetime. The adjusted seat angle also reduces disc sticking or binding and lowers valve operating torque.
Since TOVs are more affordable than other types of metal-seated valves and have better sealing capabilities, they are frequently chosen for particular applications (like petrochemical refining and transport). Due to their lightweight construction, quarter-turn design, and ease of installation, TOVs require less pipe bracing and are simple to install and operate. Additional cost reductions come from a removable seal ring that enables quick and simple repairs and from their low torque (which allows for smaller actuators).
Traditional Applications and Modern Trends Regarding Triple-Offset Valves
Desalination, water treatment and distribution, pulp and paper processing, district heating, electricity production, and oil and gas refining are just a few of the traditional TOV applications. Triple-offset valves have also been routinely featured in chemical and petrochemical plants, offshore platforms, steel mills, and sugar mills.
Their use has now increased across nearly all industries as businesses seek out solutions that are both efficient and effective due to strict governmental regulations and expanding manufacturing needs. Another element encouraging the rising use of triple-offset valves is the fact that their long-standing beneficial qualities have now been discovered for applications elsewhere.
Their operational efficiency, resistance to corrosive media and chemicals, ability to transfer materials at high temperatures or under high pressures, and adaptability to function in a variety of working conditions are just a few benefits that are transferable across business sectors. In addition, each succeeding version of triple-offset valve contains features that further enhance valve safety and build on prior TOV design elements such as:
The TOV can produce a dependable and bi-directional shutdown close to zero in high-temperature, high-pressure, and other harsh service applications by providing a precision-machined metal seat and seal ring. Additionally, a metal-to-metal seat is better able to withstand temperature changes, and the TOV's conventional right-angle conical design makes it possible for low-friction in-line sealing, which is crucial in high-temperature/high-pressure applications.
This type of valve can satisfy the criteria for fire-safe applications in hydrocarbon service thanks to their metal-to-metal seat, which is further reinforced by the TOV's quarter-turn characteristic.
Optimized Seat Angle
Even after repeated cycling, the seat angle design and Stellite® material frequently featured within the valve body seat produce a longer seal life and increased abrasion resistance. The improved seat angle helps reduce disc wedging or binding and lowers operating torque.
Advantages of Triple-Offset Butterfly Valves
A butterfly valve with three offsets is called a triple-offset valve. Two of them relate to where the shaft is in relation to the bore's center line and the sealing surfaces' disc and seat center line. While the design in the axis of the seat cone angle is the third offset. In applications where a bubble-tight shutoff is necessary, triple-offset butterfly valves are crucial.
Double-offset butterfly valves cannot always be used to shut off a system bubble-tight like triple-offset butterfly valves can. Traditional butterfly valves, meanwhile, are not well suited for some applications (such as those involving corrosive chemicals or media containing microscopic particles that might clog valves and pipes) which triple-offset butterfly valves regularly handle. Triple-offset technology provides additional advantages in certain applications as listed here:
"Cam-action" and "right angled" conical sealing designs make sure that metal sealing components never come into touch with one another until the valve is fully closed, resulting in reproducible sealing and significantly longer valve life.
Zero leakage performance is guaranteed by metal-to-metal sealing, which also ensures a bubble-tight shut-off.
They are resistant to abrasive media since the structure of these valves excludes elastomers and other materials that are commonly subject to corrosion.
Their geometric design allows triple-offset butterfly valves to operate without the sealing parts rubbing against each other.
There are no voids between sealing components, resulting in no clogging, low maintenance, and a prolonged valve life, as well as the ability to incorporate a lower torque-actuator.
Uses of Triple-Offset Butterfly Valves
Whether it is their ease of installation, operation, and repair, their better/continuous sealing capacity, corrosion resistance, ability to serve for high-pressure and high-temperature applications, or for any other benefit provided, a triple-offset butterfly valve is useful in nearly all industries. Below is a partial list of the industries and/or applications benefitting from these devices: