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Triple Eccentric Metal to Metal Bidirectional Butterfly Valve

Butterfly Valves

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Triple Eccentric Metal to Metal Bidirectional Butterfly Valve

The sealing ring of the three eccentric hard sealed butterfly valve has three designs: multi-level, elastic, and all metal. All metal hard sealing is different from multi-level hard sealing and elastic hard sealing. All metal hard sealed butterfly valves are suitable for higher temperature conditions.

    Triple offset metal sealed butterfly valve uses a stem through an approximate circular plate of the disc and the valve stem rotation to drive the rotation of the disc, in order to control the effect of fluid switch. Triple offset metal sealing butterfly valve uses the three eccentric structure with multi-layer metal seal or pure metal sealing ring, different sealing materials are being used according to the different temperature request from end user. The structure of valve sealing ring that was formed after machining for triple eccentric butterfly valve is oblique cone type, the purpose of which is to let the disc open in a subtle angle and seat sealing surface can be completely separated from the sealing surface of disc, thus to reduce the friction of sealing surface during the open and close. 


    Body & Disc: A216 WCB,A217 WC6, WC9, A351 CF3, CF8, CF3M, CF8M, A995 4A, 5A, A352 LCB, LCC, LC2, Monel, Inconel, Hastelloy (Casting) 
    Seat: 13Cr/SS304/SS316+Composite materials, PTFE 
    Stem: A276 410, 304, 316, F51, AISI 4140+ENP, 17-4PH 
    Packing: Graphite, PTFE 
    O-ring: NBR, HNBR,FKM


    Design & Manufacture: API 609,ASME b16.34 
    Face-to-face: API 609, ASME B16.10 
    End Dimension: ASME B16.5 (RF, RTJ), ASME B16.47 (RF,RTJ), MSS SP-44 (NPS 22 Only), ASME B16.25 (BW) 
    Test & inspection: API 598 

    Additional Features

    - The pressure of bidirectional flow could be afforded to achieve no flow restrictions on the installation.
    The design of renewable seat and seal ring could avoid the valve damage caused by the wear of seal ring and reduce the cost of use.
    The design of fully metal to metal sealing,The sealing surface adopts the technology of overlaying stellite alloy, which solves the problem of poor butterfly valve sealing performance under the harsh conditions of high pressure, high temperature and low temperature effectively.
    - F
    ully metal to metal sealing structure is different from multilayer sealing butterfly valve. Common multilayer metal sealing structure consists of the metal sheet and graphite laminated in stallation,
    and multilayer sealing surface is susceptible to fluid erosion leading
    to short service life. However, DBV butterfly valve adopts all metal
    forged seal ring,and overlays stellite alloy on the sealing surface. lts
    advantages are anti-wear, anti-erosion and long service life, etc.
    DBV butterfly valve is suitable for many poor working conditions
    such as high pressure and high temperature.

    Materials of Main Components

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