Butterfly Valves
Titanium B367 Gr.C-2 API Standard Flanged Butterfly Valve
Triple offset refers to adding an additional angular eccentricity on the basis of the double eccentricity structure mentioned above, even if the sealing surface of the butterfly valve is inclined and conical. The characteristic of this structure is to machine the outer edge of the butterfly plate into an outer inclined conical surface, and to machine the inner side of the sealing valve seat into an inner inclined conical surface. At this point, the sealing section of the butterfly valve has become elliptical, and the shape of the sealing surface of the butterfly plate is also asymmetrical. Due to the inclined conical sealing surface, the larger side of the butterfly plate is separated by the valve stem shaft and pressed upwards towards the valve seat along the large inclined surface, while the smaller side of the butterfly plate is pressed downwards towards the valve seat along the small inclined surface. The sealing between the butterfly plate sealing ring and the valve seat does not rely on the elastic deformation of the valve seat, but entirely on the compression of the contact surface to achieve sealing. Therefore, the opening and closing of the three eccentric butterfly valve are basically frictionless, and as the closing pressure increases, the valve closes tighter and tighter.
Range
Standards
Additional Features
The valve seat of a three eccentric butterfly valve is made of stacked stainless steel and graphite sheets. This structure can effectively prevent the influence of small solid objects in the medium and the possible sealing surface bite caused by thermal expansion. Even if there is minor damage, there will be no leakage, which is unimaginable for a double eccentric butterfly valve or other three eccentric butterfly valves.
The sealing ring of the three eccentric butterfly valve can be said to be unique. Not only can the main valve seat be replaced, but also because the sealing surface of the butterfly plate is independent of the butterfly plate, the sealing surface of the butterfly plate can also be replaced. This means that when the sealing surface of the butterfly plate is damaged, there is no need to rush back to the manufacturing factory or disassemble the valve. Only the sealing surface of the butterfly plate needs to be replaced. This not only greatly reduces maintenance costs, but also greatly reduces maintenance hours, maintenance intensity, and difficulty.
Materials of Main Components
| NO. | Part Name | Material |
| 1 | Bottom Cover | B367 Gr.C-2 |
| 2 | Body | B367 Gr.C-2 |
| 3 | Lower Stem | B381 Gr.F-2 |
| 4 | Pin | B348 Gr.2 |
| 5 | Disc | B367 Gr.C-2 |
| 6 | Upper Stem | B381 Gr.F-2 |
| 7 | Packing | Graphite |
| 8 | Gland | B367 Gr.C-2 |
| 9 | Yoke | CS |
| 10 | Seat | Titanium |
| 11 | Sealing Ring | Titanium |
| 12 | Pressure Plate | 304 |
Applications
The three eccentric butterfly valve, as the crystallization of the latest technology in valves, showcases the strengths of various valves and avoids the weaknesses of various valves, will undoubtedly receive increasing attention from users and designers. Its maximum pressure rating can reach 2500 pounds, the standard diameter can reach 48 inches, and it can be matched with clamps, lugs, flanges, ring joints, butt welds, jackets, various structural lengths, etc. Moreover, due to the wide range of material selection, it can also correspond freely with high and low temperatures, as well as various corrosive media such as acid and alkali. Especially in terms of large diameter, with its advantage of zero leakage, it is constantly replacing bulky gate and ball valves in shut-off valves. Similarly, with its excellent control function, it is also constantly replacing bulky globe valves in regulating valves. As a fact, it is used in various important pipelines such as process control in major industrial fields such as oil and gas extraction, offshore platforms, oil refining, petrochemicals, inorganic chemicals, and energy generation, including China. Three eccentric butterfly valves are widely used in industrial pipelines such as metallurgy, power, petrochemicals, water supply and drainage, and municipal construction where the medium temperature is ≤ 425 ℃. They are used to regulate flow and cut off fluid.