LugTriple offset Butterfly Valve

Short Description:

Size Range:  2”-48” (50mm-1200mm)

Pressure Rating: ASME 150LB, 300LB

Temperature Range: -46℃– +600℃

Connection: Lug

Shutoff tightness: Zero Leakage

Structure : Multi-layer , Metal to Metal

Material: WCB, CF8M, A105, F316, C95800, Titanium, Monel, Hastelloy etc.

Operation: Lever, Gear, Pneumatic, Electric OP

Product Detail

Applicable Standards



Product Tags


NSEN Lug Triple offset butterfly valve are widely used in pulp and paper and chemical, petrochemical and refining industries. With superior tightness butterfly valve operate in both control and shut-off applications.

• Laminated sealing & Metal to metal sealing

• Bi-directional & Uni-directional

• Low opening torque

• Friction free between seat and sealing

• Tilted cone sealing face

• Lubricated bearing

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  • Valve Marking: MSS-SP-25
    Design & Manufacture: API 60
    Face to Face Dimension: API 609, ISO 5752, EN 558
    End Connection: ASME B16.5, ASME B16.47, EN 1092, JIS B2220, GOST 12820
    Test and Inspection: API 598, EN 12266, ISO 5208, ANSI B16.104

    NSEN provide the option for fixed seat and floating seat which can be repaired without remove the valve from site, it could shorten the maintenance time and greatly improve efficiency. The fixed seat apply to the valve where the medium flow forward , so the tight shutoff sealing is just for one direction, and it should pay attention to the flow direction when it was installed . Although the seat are fixed, but the sealing of disc still could be removed. If the valve apply with floating seat, you could install at any direction.

    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.

    Self lubricating 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.

    Seal ring material        
    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.

    Packing-combined sealing system       
    NSEN adopt this structure to ensure valve leakage could meet ≤20ppm at maximum. The dynamic sealing structure is available if necessary, which make the packing sealing under good condition and prolong the free maintenance period of packing.

    Evenly Fixed Structure      

    Butterfly valve’s sealing ring is fixed with evenly distributed bolts/nuts. Every bolt is precisely located and endure force evenly. This structure eliminates the problems of leakage or loose sealing ring due to uneven force of bolts and nuts.

    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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