Lug butterfly valve

Body: ASTM A536 65-45-12, WCB, CF8M
Disc: ASTM A536 65-45-12 Nylon coated, CF8, CF8M, 2507, 1.4462
Stem: SS420, SS431
Body style: lug
Nominal diameter: 2″ – 80″ (DN50mm – DN2000mm)
Top flange: ISO5211
Operating pressure: 16bar for DN50-DN300, 10bar for DN350-DN2200
Flange accommodation: EN 1092 PN 6/PN10/PN16,ASME Class,JIS 5K/10K

    Category: Butterfly valve


    Lug butterfly valve

    Lugged butterfly valve, the ideal solution for many industrial applications. Featuring a cartridge type seat, streamlined disc and strong stem-to-disc connection, this concentric butterfly valve is designed for easy use in all industries including food and beverage, pulp and paper, chemical, mining, water treatment and power plants. The lug body comes with a lip design that ensures full rated unidirectional dead-end service. Additionally, this device is equipped with features like ISO5211 top flange together with stem square suitable for direct mounting of actuators, stem anti-blowout design for safety in field use and dirt scraper to prevent moisture from entering the shaft area. It also boasts of no exposed pins or bolts for stem-to-disc connection or flange gaskets required. Furthermore there is no risk of damage during installation in closed position as it comes with bubble tight shut off at full pressure rating. With large flow capacity and enough strength due to streamline disc design along with plug with O-ring sealing to eliminate any leakage from the stem – Lug butterfly valves promises unmatched quality performance!

    Lug concentric butterfly valve features a cartridge type seat, streamlined disc and strong stem-to-disc connection for easy use in many industrial applications such as food and beverage, pulp and paper, chemical, mining, water treatment, power plants, etc. Full rated unidirectional dead-end service is achieved by a lip designed in the lug body.

    Key Features:

    • Designed for easy actuator mounting with ISO5211 top flange and stem square.
    • Enhanced safety with anti-blowout stem design.
    • Built-in dirtscraper prevents moisture from entering the shaft area.
    • Suitable for high pressure and vacuum service thanks to cartridge seat design.
    • Provides full-rated unidirectional dead-end service with lip in the lug body.
    • Secure stem-to-disc connection with no exposed pins or bolts.
    • Eliminates the need for flange gaskets.
    • No risk of valve damage during closed position installation.
    • Ensures a tight shut-off at full pressure rating.
    • High flow capacity and strength due to streamlined disc design.
    • O-ring sealed plug eliminates stem leakage.


    NO. Part name Material
    1 Body ASTM A536 65-45-12, WCB, CF8M
    2 Disc ASTM A536 65-45-12 Nylon coated, CF8, CF8M, 2507, 1.4462
    3 Seat EPDM, NBR, FPM
    4 Stem SS420, SS431
    5 Lower Stem SS420, SS431
    6 Retainer Nylon for DN50-DN300, SS304 for DN350-DN2000
    7 Bearing RPTFE with Graphite on I.D.
    8 Weather seal NBR
    9 Weather seal NBR
    10 Plug Steel galvanized for DN50-DN300, Cover plate for
    DN350-DN2000 material same as body with SS304 bolts
    11 Screw SS304


    Body style FLug
    Nominal diameter 2″ – 80″ (DN50mm – DN2000mm)
    Top flange ISO5211
    Operating pressure 16bar for DN50-DN300, 10bar for DN350-DN2200
    Temperature range -20 °C to + 140 °C (depending on pressure, medium and material)
    Flange accommodation EN 1092 PN 6/PN10/PN16
    ASME Class 150
    AS 4087 PN10/ PN16
    JIS 5K/10K
    Applications Potable Water, Wastewater, Seawater, HVAC
    Operation Hand lever, gear box, pneumatic actuator, electric actuator

    lug vakve

    The Lug Butterfly Valve. This product stands as a testament to our unwavering dedication to superior quality, technical excellence, and industry-leading innovation in valve manufacturing.

    Our Lug Butterfly Valve is an engineering masterpiece, designed with precision to ensure optimal performance even under the most challenging conditions. The lug-style design offers a robust and secure connection, providing enhanced support and stability that sets it apart from conventional butterfly valves.

    This state-of-the-art valve is crafted from top-tier materials, ensuring remarkable resistance against corrosion and wear. Its durability underscores our commitment to quality control, offering sustained high performance that resonates with our brand’s authoritative voice in the industry.

    The key feature of our Lug Butterfly Valve is its disc, meticulously engineered for efficient flow control. The 360-degree rotating disc provides unparalleled regulation, allowing for precise flow management, from full shut-off to unrestricted flow.

    As a global leader in the valve manufacturing industry, we adhere to rigorous international standards, ensuring our products meet and exceed operational requirements across diverse applications worldwide. The Lug Butterfly Valve is no exception, reflecting our expertise and global reach.

    Experience the blend of technical sophistication and practical functionality with our Lug Butterfly Valve – a product that truly embodies our brand’s confident and authoritative voice in the valve manufacturing industry. Trust us to deliver solutions that propel your business forward.


    What is a lug style butterfly valve?

    A lug style butterfly valve is a type of quarter-turn rotary valve that is used to regulate and control the flow of liquids or gases in a wide variety of industrial applications. It works by using an actuator (often an electric, pneumatic, or hydraulic motor) to rotate a disc inside the valve body. When completely open the disc is perpendicular to the flow path allowing maximum flow rate through it; when closed, it forms an almost complete seal and blocks any further passage. Lug style butterfly valves are known for their relatively small size compared to other valves, while also being able to handle high volume flows due to their larger internal diameter.

    The name “lug” comes from the fact that these types of valves have lugs protruding from either side which serve as mounting points for actuator arms or levers external to the pipe line in order for them be opened or closed manually if necessary during maintenance operations. As far as advantages and disadvantages are concerned, lug style butterfly valves provide dependable service at pressures up to 200 psi (13 Bar), allow for bi-directional operation with minimal leakage due to its double elastomer seat design when properly installed and maintained, but can suffer from stem wobble over time which can reduce its effectiveness if not addressed promptly.

    What is the difference between lug type and wafer?

    The main difference between lug type and wafer type valves lies in their respective construction. Lug type valves are constructed from long, thick pieces of metal that have lugs cast into them on either end. These lugs provide a means to connect the valves directly to the pipe using bolts and nuts or with flanges. On the other hand, wafer-type valves use thin discs known as gaskets to provide both a seal between the valve body and mating flanges, as well as support for these flanges during operation.

    Lug type valves have been traditionally used for applications where cost is not an issue, since they are usually more expensive than their wafer equivalents due to their larger size. However, they offer several substantial benefits over wafers: they provide better stability due to increased surface area contact; therefore reducing vibrations; easier installation since no welding is required; they can be checked visually before tightening flange bolts making inspection easier; and higher pressure ratings due to larger gasket contact surfaces improving overall safety performance compared to its smaller counterparts.

    Wafer-type valves present some advantages over lug types when it comes down key factors such as space saved nearby installations (since there is no need for extra clearance), convenience in removal (they do not require disassembly from attached flanges) cheaper prices compared with lug types (due mainly because of simpler design), faster delivery times (since less material needs manufacturing); however if we talk about safety performance then at this point lug types will offer better features since pressure rating is considerably lower than those found in its equivalent models with this kind of construction.

    In conclusion, whether you should choose one style over another depends largely upon your specific application needs — refineries or chemical plants may benefit more from investing in a high quality strength valve like those of the lug variety while small fry domestic water systems could probably get away with using an equally dependable but much cheaper wafer choice instead.

    What are the advantages of a lug butterfly valve?

    A lug butterfly valve is a quarter turn valve typically used to regulate, stop or start the flow of gases and liquids in pipelines. These valves are popular because they have low-pressure drop across them, which makes their installation and operation cost-effective. Furthermore, they require minimal maintenance and space as compared to other types of valves making them an ideal choice for many applications.

    The biggest advantage of a lug butterfly valve is that it provides tight shutoff with both sides of the seat being metal-to-metal contact when the disc fully contacts with the seat; thus, there is very little leakage occurring during operations even at higher temperatures or pressures. Additionally, these valves typically use a linear motion instead of rotary motion which prevents premature wear on seals or bearings due to less friction from components touching each other in operation.