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


    What is a butterfly valve used for?

    A butterfly valve, an integral component within the realm of valve technology, is specifically engineered for regulating or isolating fluid flow. This sophisticated piece of equipment owes its name to the butterfly disc, the pivotal element that rotates to enable a swift and efficient control of flow.

    Primarily, butterfly valves are employed in wide-ranging industrial applications such as water supply, wastewater treatment, fire protection, and power generation, underscoring their versatility and reliability. They are also utilized in high-pressure and high-temperature systems owing to their robust design and superior sealing capabilities.

    These valves offer distinct advantages over gate valve, including a compact footprint, lower installation costs, and minimal maintenance requirements. Moreover, they are celebrated for their ability to provide a nearly unrestricted flow of fluid, resulting in lower pressure drop and increased energy efficiency.

    What are the main differences between a U-style flange butterfly valve and a regular flange butterfly valve?

    The U-style flange butterfly valve, often referred to as a wafer butterfly valve, is lauded for its streamlined design and versatility. The ‘U’ in its moniker represents the U-shaped seal ring, an innovative feature that mitigates potential leakages and guarantees optimal performance even under extreme operational conditions. This valve’s ability to be installed between two pipeline flanges, offering bi-directional flow and shut-off control functionality, is a testament to our technical ingenuity. Its lightweight nature, ease of installation, and cost-effectiveness underscore its global acceptance across diverse industry sectors.

    Contrastingly, the regular flange butterfly valve, also known as a lug butterfly valve, is defined by its robust construction and unparalleled durability. Unlike its U-style counterpart, this valve boasts a lug body with threaded inserts at both ends. This allows the valve to be securely installed into a system using two sets of bolts without the need for nuts. This meticulously engineered design allows for disconnection on either side of the piping system without disrupting the opposing side. Consequently, it is exceptionally suited for managing higher pressure systems and end-of-line applications.

    What are the standards for U-stlyle flange butterfly valves?

    One of the key standards for U-style flange butterfly valves is the EN593, which stipulates the requirements for their design, face-to-face dimensions, pressure ratings, materials, and testing procedures. In addition, the AWWA C504 standard also applies, particularly in terms of life expectancy, laying length, and pressure handling capabilities.

    Moreover, these valves are designed to comply with MSS SP-67, API 609, and BS5155 regulations, which outline the specifications for butterfly valves used in pipeline systems. They also adhere to the ANSI B16.1, DIN PN10/16/25, BS4504, and ISO PN10 standards for flange connections

    What are the different types of butterfly valves?

    In the vast domain of valve manufacturing, butterfly valves are a cornerstone, renowned for their efficiency, versatility, and compact design. Utilizing our industry-specific expertise and globally recognized certifications, we have developed an array of butterfly valves, each tailored to cater to distinct application needs with precision and reliability.

    1. Wafer Butterfly Valves: Characterized by their thin, wafer-like bodies, these valves are lightweight and compact, making them ideal for systems where space is a constraint. Their design facilitates easy installation between pipe flanges, providing effective shut-off in high-pressure environments.
    2. Lug Butterfly Valives: These sturdy valves feature lugs around the outer edge that enable them to be installed into a system using sets of bolts without the need for nuts. This design allows for the disconnection on either side of the piping system without disrupting the opposing side, making them suitable for end-of-line applications.
    3. U-Style Flange Butterfly Valves: These valves boast a U-shaped seal ring that effectively mitigates potential leakages, ensuring optimal performance even under extreme operational conditions. They can be installed between two pipeline flanges, offering bi-directional flow control and shut-off functionality.
    4. Double Offset Butterfly Valves: With two offsets from the centerline, these valves offer a tighter seal, reduced friction, and longer lifespan. They are designed for higher pressure systems and more demanding applications.
    5. Triple Offset Butterfly Valves: These valves incorporate three offsets into the design, resulting in a virtually frictionless seal with no wear and tear. They are highly durable and are often used in critical applications involving high temperatures and pressures.

    PN10 flange size


    PN16 flange size