Butt Weld Triple offset Butterfly Valve

Short Description:

Size Range:  2”-144” (50mm-3600mm)

Pressure Rating: ASME 150LB, 300LB, 600LB, 900LB,

Temperature Range: -46℃– +600℃

Connection: Butt weld

Shutoff tightness: Zero Leakage

Structure: Multi-laminated , Metal to Metal

Material: Carbon steel, Stainless steel , Aluminum Bronze, Duplex, Titanium, Monel, Hastelloy etc.

Operation: Lever, Gear, Pneumatic, Electric OP

Product Detail

Applicable Standards




Product Tags


NSEN Weld type Triple offset butterfly valve could provide both laminated sealing and fully metal sealing. Forged body is to be applied for this series, it could avoid internal looseness that cannot be seen during the casting process and the defects of body strength and axial force by plate welding process. NDE inspection will be done if requested by clients, we could provide the service to arrange it.

• Laminated sealing & Metal sealing

• Low opening torque

•  Zero leakage

• Blow out proof shaft

•  Friction free between seat and disc sealing

•  Tilted cone sealing face

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  • Valve Marking: MSS-SP-25

    Design & Manufacture: API 609, EN 593

    End Connection: ASME B16.25

    Test and Inspection: API 598, EN 12266, ISO 5208


    Triple offset butterfly valve add a third angular eccentric based on double eccentric structure. The third offset is consist of an certain angle between center line of valve body and conical seat sealing face, it ensure the sealing ring of the disc can be separated or touched with seat rapidly so that friction and squeeze between seat and sealing ring will be eliminated. 

    Friction free design

    The use of triple eccentric structure reducing the friction during switching between the sealing surface of the disc and valve body, so that the disc can quickly disengage the valve seat when the triple eccentric butterfly valve is opened or closed.

    Low opening torque

    This serial uses the Radial Dynamically Balanced Sealing System,by means of optimized design, the forces undertaken on both sides for the butterfly disc inlet and outlet become approximately balanced so as to effectively lower the valve opening torque.

    Lubricated bearing

    In order to reduce the operation torque and avoid lock of stem under frequently open and close, a customized self-lubricating bushing has been applied. 

    Anti-blow out stem design

    Each of valve add the blow out proof design on stem position as per standard API609.

    Seal ring of laminated type is made of stainless steel plate with graphite/ carbon fiber/ PTFE etc.  Compare to the rubber asbestos plate material, our adopting material is more wearable, anti-flush, reliable and better for environmental.

    Seat ring of metal sealed butterfly valve is made of forged alloy steel which has the advantages of anti-scour, wear-resistance, high pressure and temperature resistance and long life span. 

    Trim material is made of high quality stainless steel, it could avoid the corrosion problem after long time using.

    District energy : Thermal power station, heat exchange station, regional boiler plant, hot-water loop, stem pipe system

    Refinery : Brine, Carbon dioxide vapor, propylene plant, vapour system, propylene gas, ethylene plant, ethylene cracking device, coking plant               

    Nuclear power plant : containment isolation, seawater desalination system, brine system, core spray system, pump isolation

    Thermal power generation : condenser cooling, pump and steam extraction isolation, heat exchanger, condenser cooling isolation, pump isolation

    Low temperature : liquid gas, liquefied natural gas systems, oilfield recovery systems, gasification plants and storage equipment, liquefied natural gas transportation systems

    Pulp and paper : steam isolation, boiler water, lime and mud

    Oil refining : Oil storage isolation, air supply valve, desulfurization system and waste gas processor, flare gas, acid gas isolation, FCCU

    Natural gas

    NSEN strictly follow the free repair, free replacement and free return services within 18 months after the valve is ex-works or 12 months after being installed and used on the pipeline after ex-works (upon which comes first). 

    In the case the valve gets failed due to the quality problem during the use in the pipeline within the quality warranty period, NSEN will provide free quality warranty service. The service shall not be ended until the failure is surely made settled and the valve normally workable as well as the client signs the letter of confirmation.

    After expiration of the said period, NSEN guarantees to provide the users with on-time quality technical services whenever the product needs to be repaired and maintained. 

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