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Titanium B367 Gr.C-2 API Standard Flanged Butterfly Valve

Butterfly Valves

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Titanium B367 Gr.C-2 API Standard Flanged Butterfly Valve

A triple offset ( three eccentric ) butterfly valve is one in which the axis of the valve stem deviates from both the center of the disc and the center of the body, and the axis of the valve seat rotation is at a certain angle to the axis of the valve body channel.

    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.


    - Size from 1 1/2” to 48” ( DN40mm to DN1200mm).
    - Pressure ratings from Class 150LB to 600LB ( PN10 to PN100).
    - Double flange, Lugged, wafer and but-welded end.
    - Sealing ring can be multilayer metal with graphite, elastic seat ring, full metal.
    - Driver selection can be bare stem with ISO5211 top flange for your actuators.
    - Common materials and special high alloy materials are available.


    Design Standard: ANSI B16.34
    Pressure & Temperature Standard: ASME B16.34
    Flange Diameter Standard: ASME B16.5, ASME B16.47, BS EN 1092
    Face-to-face Standard: API 609, MSS SP-68, ISO 5752, BS EN 558
    Pressure Test Standard: API 598

    Additional Features

    Dual security structure

    According to the specifications of API609, in order to prevent deformation of the butterfly plate, misalignment of the valve stem, and bite of the sealing surface caused by fluid pressure and temperature, two independent thrust rings are installed on the upper and lower sides of the butterfly plate, ensuring the normal operation of the valve under any working condition;

    At the same time, in order to prevent sudden accidents caused by unknown reasons such as valve stem damage and flying out, independent valve stem flying out prevention mechanisms were designed at both the inner and outer ends of the valve, which also indirectly ensures that the pressure level can reach up to 2500 pounds.

    No dead zone design

    In the design process, special consideration was given to the application issues in the field of regulation, and the sealing principle of the three eccentric butterfly valve was fully utilized. The butterfly plate did not scratch the valve seat when the valve was opened and closed, and the torque of the valve stem was directly transmitted to the sealing surface through the butterfly plate. This means that there is almost no friction between the butterfly plate and the valve seat, thus eliminating the common jumping phenomenon when opening ordinary valves, eliminating the instability caused by friction and other unstable factors in the low opening range of the valve. This means that the three eccentric butterfly valve can almost enter the controllable area from 0 degrees to 90 degrees, and its normal regulation ratio is 2 times that of ordinary butterfly valves. More than twice, with a maximum regulation ratio of 100:1 or higher. This creates favorable conditions for the use of three eccentric butterfly valves as control valves, especially in large diameters where the cost of shut-off valves is extremely high. In addition, shut-off valves cannot achieve zero leakage, and in emergency shutdown conditions, shut-off valves must be installed on the side of the shut-off valve. The three eccentric butterfly valve integrates regulation and shutdown, and its economic benefits are extremely considerable.

    Body valve seat structure

    The three eccentric butterfly valve adopts a body valve seat structure and installs the valve seat on the body. Its advantage is that compared with butterfly valve seats, it greatly reduces the chance of direct contact between the valve seat and the medium, thereby reducing the degree of erosion of the valve seat and extending its service life.

    Thin film valve seat structure

    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.

    Replaceable sealing pair

    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


    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.