Pneumatic lug butterfly valve

Body: ASTM A536 65-45-12, Ductile iron, WCB, CF8M
Disc: ASTM A536 65-45-12 Nylon coated, CF8, CF8M
Body style: LUG type
Nominal diameter:2″ – 80″ (DN50mm – DN2000mm)
Flange : DIN PN10 PN16,JIS 5K 10K, ANSI CLASSS 150LB, JIS5K 10K
Pneumatic actuator: Double acting, Single acting


    Pneumatic Lug Butterfly Valve

    Introduction and Purpose

    The Pneumatic Lug style Butterfly Valve is a cutting-edge and versatile valve system designed to manage and regulate the flow of liquid or gaseous media in various applications. Combining pneumatic actuators and central line butterfly valves, it provides a dependable and efficient method of operation with full open and full close actions. Available in both metal seal and soft seal variants, this valve caters to various sealing requirements, making it a reliable choice across different industries.

    Technical Specifications

    • Materials: This robust valve is made of top-grade materials, ensuring longevity and reliability. The body is constructed of ASTM A536 65-45-12, WCB, or CF8M, while the disc is available in ASTM A536 65-45-12 Nylon coated, CF8, CF8M, 2507, and 1.4462. The valve seat is made from EPDM, NBR, FRM, or PTFE, and the stem is made from SS420 or SS431.
    • Size and Design: With a nominal diameter range of 2″ – 80″ (DN50mm – DN2000mm), this versatile valve can cater to a wide array of applications. Its LUG body style features a sturdy build coupled with an ISO5211 top flange.
    • Temperature Range: Operating between -20 °C and + 120 °C, this valve is suitable for use in an extensive range of temperature conditions, based on pressure, medium, and material factors.
    • Operating Pressure: This valve is designed to withstand pressures of 16bar for DN50-DN300 and 10bar for DN350-DN2000.
    • Valve Structure: The Pneumatic Lug Butterfly Valve is compatible with many flange accommodations such as EN 1092 PN 6/PN10/PN16, ASME Class 150, AS 4087 PN10/ PN16, and JIS 5K/10K, which further increases its applicability.
    • Pneumatic Actuator: Offering double-acting (failure to maintain), single-acting normally closed (failure to close), and single-acting normally open (failure to open) actions, this valve provides an adaptable pneumatic actuation that caters to specific use case requirements.

    Optional Accessories

    The Pneumatic Lugged Butterfly Valve can also be accompanied by several optional accessories for enhanced performance and control, including a solenoid valve, limit switch box, air filter relief pressure valve, E/P positioner, and manual device.

    Installation and Operation

    The Pneumatic Lug Valve can be easily installed by aligning the valve body with the respective mounting flange holes in your system. Once mounted, the valve stem can be connected to the pneumatic actuator, which then enables the valve to operate by driving the valve disc through a 90-degree rotation. This ensures a full open or full close action, allowing for precise and reliable control of fluid flow.

    Technical parameters

    Body Material ASTM A536 65-45-12, Ductile iron,WCB, CF8M
    Disc Material ASTM A536 65-45-12 Nylon coated, Ductile iron,CF8, CF8M, 2507, 1.4462
    Stem SS420,SS431, 14-7H
    Body style LUG type
    Nominal diameter 2″ – 80″ (DN50mm – DN2000mm)
    Top flange ISO5211 (electric actuator, pneumatic actuator)
    Operating pressure: 16bar for DN50-DN300, 10bar for DN350-DN2000
    Temperature: -20 °C to + 140 °C (depending on pressure, medium and material)
    Flange EN 1092 PN 6/PN10/PN16, ANSI Class 150
    DIN PN10/ PN16 ,JIS 5K/10K

    Pneumatic actuator

    Actuator action
    Double acting Failure to maintain
    Single acting normally closed Failure to close
    Single acting normally open Failure to open
    Optional accessory Solenoid valve
    limit switch box
    air filter relief pressure valve,
    E/P positioned
    manual device.

    Outline size drawing: 


    lug fly valve

    In the realm of valve technology, we are thrilled to bring forth our latest innovation: the Pneumatic Lugged Butterfly Valve. This state-of-the-art instrument is a testament to our unwavering commitment to quality and technical precision. Designed with the most stringent industry specifications in mind, this valve offers unparalleled performance across a spectrum of applications – from petrochemical plants and water treatment facilities to power generation and HVAC systems. Our pneumatic lug butterfly valve integrates a unique lug design and pneumatic actuation system, ensuring superior control and durability even under high-pressure conditions. Its robust construction adheres to our stringent quality control measures, reflecting our global standard certifications. With the Pneumatic Lug Butterfly Valve, we continue to solidify our position as leaders in valve manufacturing, empowering industries around the world with reliable, high-performing solutions.


    What is a lug butterfly valve?

    A lug butterfly valve is an exemplary flow control device renowned for its robust construction and versatile application across various sectors, including petrochemical processing, water and wastewater management, and HVAC operations. Characterized by its distinctive lug-based design, this valve features threaded inserts around the valve body’s perimeter that facilitate direct bolting to flanges, thereby ensuring a secure and stable connection within piping systems.

    How does a lug butterfly valve work?

    A lug butterfly valve operates on the principle of rotational motion to regulate fluid dynamics within industrial systems. Precision-engineered, this device consists of a disc, which is the primary flow control element, securely mounted on a robust shaft that traverses the valve’s diameter. The disc’s orientation within the pipeline is manipulated via an actuator—be it manual, pneumatic, or electric—allowing for swift and precise modulation from an open to a closed position and anywhere in between.

    What are the advantages of using a lug butterfly valve?

    Enhanced Sealing Capabilities: The lug configuration allows these valves to facilitate bidirectional sealing, making them intrinsically suitable for systems requiring stringent isolation capabilities.

    Ease of Installation and Maintenance: With threaded inserts located on the valve body, our lug butterfly valves enable direct bolting to flanges, streamlining installation processes. This design feature also simplifies maintenance operations, as the valve can be removed without detaching the piping system in its entirety.

    Space Efficiency: The compact nature of our lug butterfly valves ensures a minimal footprint within piping systems, an essential quality for facilities where space optimization is critical.

    Versatility: Crafted from an assortment of robust materials, our valves demonstrate exceptional adaptability across diverse mediums—liquids, gases, and semi-solids—while maintaining their integrity in various temperature and pressure conditions.

    Certification Compliance: Our commitment to excellence is reflected in our adherence to international standards, including API 609 and ISO 9001:2015, assuring clients of our valves’ compliance with global benchmarks of quality.

    How do I choose the right size and material for my lug butterfly valve?

    Selecting the optimal size and material for your lug butterfly valve necessitates an uncompromising approach to system analysis, ensuring a commanding alignment with rigorous industry demands. The chronology of this selection process is unequivocal.

    Firstly, dimensionality is paramount. The valve’s nominal size must mirror the inner diameter of your pipeline for seamless integration, guaranteeing an authoritative control over flow rates and system pressures. With sizes ranging methodically from 2 inches to 60 inches, our lug butterfly valves accommodate the vast spectrum of industrial requirement, underpinned by our mastery in precision engineering.

    In choosing material composition, one must consider the operational milieu with astute discernment. Our offerings encompass stainless steel, lauded for its formidable resistance to corrosion and exceptional durability, aluminum for scenarios where weight is a critical factor, and thermoplastics such as PVC and PP for applications demanding superior chemical inertness. Each material is selected through a lens of steadfast expertise, targeting the medium’s unique characteristics including corrosivity, abrasion potential, and sanitary prerequisites.

    What industries commonly use lug butterfly valves?

    Lug butterfly valves, with their robust construction and versatile design, are integral components within a plethora of discerning industry sectors that demand not only precision but also enduring reliability under a gamut of operational conditions.

    In the pharmaceutical industry, where contamination-free environments and process integrity are paramount, lug butterfly valves provide the requisite flow control precision and material compatibility.

    The manufacturing realm, known for its diverse and demanding applications, relies on the adaptability of lug butterfly valves to regulate flows of varying viscosities and compositions.

    Food processing industries mandate hygienic valves that can endure frequent washdowns and resist corrosive food media.

    When addressing the needs of water treatment, as well as oil and gas sectors, lug butterfly valves demonstrate an exceptional capability to manage large volumes of fluid, proving their worth in systems that operate under high pressure and temperature conditions.

    working principle

    Pneumatic actuator working principle: Double acting Double acting working (Counterclockwise) Compressed air to Port 2 forces the pistons outwards, causing the output shaft to turn counterclockwise, while the air is being exhausted from Port 4.(Clockwise) Air to Port 4 forces the pistons inwards, causing the pinion to turn clockwise while the air is being exhausted from Port 2. Single actingSingle acting working (Clockwise) Loss of air pressure, the stored energy in the springs forces the pistons inwards,the pinion turns clockwise, while air is being exhausted from Port 4. pneumatic actuator