U Style flanged butterfly valve

Body:   ASTM A536 65-45-12, WCB, CF8M
Bonded with NBR or EPDM
Disc:  ASTM A536 65-45-12 Nylon coated, CF8, CF8M, 2507, 1.4462
Stem:  SS420,SS431
Body style:   Flange
Nominal diameter:   2″ – 88″ (DN50mm – DN2000mm)
Top flange:  ISO5211
Operating pressure:  16bar for DN50-DN300, 10bar for DN350-DN2200


    The Ultimate Guide to U Style Flanged Butterfly Valves

    Flange butterfly valve are versatile, reliable, and cost-effective solutions for numerous industrial applications, providing superior flow regulation and throttling capabilities. In this guide, we will walk you through the main features of these valves, their proper installation and operation, maintenance, troubleshooting, and much more. Rest assured that by the end of this guide, you will have an in-depth understanding of U style flanged butterfly valves and their applications.

    Main Features and Components

    • ISO 5211 Top Flange: Designed for direct mounting of actuators, providing a tight and secure connection for efficient valve operation.
    • Stem Anti-Blowout Design: This safety feature prevents the stem from being ejected out of the valve during operation, ensuring workplace safety and equipment integrity.
    • Two-piece Construction: Allows for minimal leakage and maintenance by simplifying the valve’s design and improving its sealing capabilities.
    • Rotatable Disc: Provides precision flow control, enabling users to fine-tune flow rates effortlessly.
    • Full-Ported Design: Ensures smooth and continuous fluid flow with minimal pressure drop, increasing overall system efficiency.


    1. Verify that the valve size, pressure rating, and material compatibility match the system requirements.
    2. Inspect the valve and ensure that the sealing surfaces are clean and free from defects.
    3. Install the valve between properly aligned flanges, with the disc in a slightly open position to avoid damage to the sealing surfaces.
    4. Apply gasket material, if required, between the valve and flanges, ensuring a tight seal.
    5. Secure the flanges using the appropriate bolt and nut combination, tightening bolts in a star pattern for even pressure distribution.


    1. Open and close the valve a few times to ensure smooth operation before applying system pressure.
    2. If equipped with a manual handwheel or lever, ensure proper orientation and accessibility for ease of operation.
    3. For automated valves, connect the actuator to the appropriate power supply and control system, ensuring compatibility and proper settings.

    Suitable Fluids and Industrial Automation

    Wafer butterfly valve are suitable for various fluids, including:

    • Water
    • Oil
    • Gas
    • Chemicals
    • Fine particles

    U style flanged butterfly valve are the perfect solution for any application requiring precise flow regulation and throttling. This full-ported valve provides continuous fluid flow with minimal pressure drop, offering superior performance. The two-piece construction and rotatable disc allow for precise control over the flow rate. The lightweight, compact design is easy to install between flanges and requires minimal maintenance. lug butterfly valve offer a cost effective solution compared to other options on the market today – invest in quality today for reliable and long lasting performance! Upgrade your system now and choose a U style flanged butterfly valve.


    • ISO5211 top flange together with stem heat suitable for direct mounting of actuators
    • Stem anti-blowout design keep safety in field use
    • Bonded seat protects the body and shaft out of contact with medium
    • No exposed pins or bolts for stem-to-disc connection
    • Single flange mounting is possible
    • Can be installed in any desired position
    • Bubble-tight shut off at full pressure rating
    • Large flow capacity and enough strength
    NO. Part name Material
    1 Body ASTM A536 65-45-12, WCB, CF8M
    Bonded with NBR or EPDM
    2 Disc ASTM A536 65-45-12 Nylon coated, CF8, CF8M, 2507, 1.4462
    3 Stem SS420,SS431
    4 Screw SS304
    5 Retainer SS201
    6 Weather seal NBR
    7 Bearing RPTFE with Graphite on I.D.
    8 Lower Stem SS420, SS431
    9 Bottom cover Same as body
    10 Bolt SS304
    11 Screw SS304


    Body style Flange
    Nominal diameter 2″ – 88″ (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 150AS 4087
    PN10/ PN16JIS 5K/10K
    Applications Potable Water, Wastewater, Seawater, HVAC
    Operation Hand lever, gear box, pneumatic actuator, electric actuator

    U Style flanged butterfly valve