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    AI Overview
    A welded ball valve with a bare stem is a robust, permanently sealed valve designed for high-pressure, leak-free operation, often in oil and gas pipelines. It features a fully welded body, eliminating bolted joints, and an ISO 5211 mounting pad for actuator installation. These valves, typically trunnion-mounted for sizes 2-48 inches, withstand extreme conditions and feature anti-blowout, bare stems with PTFE or O-ring seals. 
    Key Features and Design 
    • Welded Body: Prevents leakage by eliminating gaskets, providing a strong, maintenance-free, or low-maintenance structure.
    • Bare Stem (ISO 5211): Topworks designed for direct mounting of pneumatic, hydraulic, or electric actuators rather than manual handles.
    • Trunnion Mounted: Provides stable operation and reduced torque for large diameter or high-pressure valves.
    • Seal System: Often includes emergency sealant injection ports, especially for larger valves, to maintain sealing integrity.
    • Safety Features: Fire-safe to API 607, anti-static, and blow-out proof stems are standard. 
    Typical Applications 
    • Long Distance Pipelines: Suited for underground installation in unattended locations.
    • High-Pressure Environments: Often used in class 150 to class 2500 systems.
    • Oil & Gas/Energy: Ideal for natural gas, oil transportation, and refining processes. 
    Specifications 
    • Sizes: Common from 2" to 48".
    • Materials: Carbon steel, stainless steel, and duplex stainless steel.
    • Design Standards: API 6D, ASME B16.34. 
    Welded ball valves with bare stems are generally designed to be permanently installed, often with a 30 to 50-year service life. 
    • Bare Stem Ball Valve
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      Zhejiang Relia Valve
    • Welded Body Trunnion Mounted Ball Valve Manufacturer | WarrenValve
      The valves are standard with: * Double block and bleed * Emergency sealant injection fittings * NACE and API 607 fire-safe * Three...
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    • Virgo WL Series Welded Body Trunnion Ball Valve
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    • All welded Trunnion Ball Valve
      Feb 25, 2017 — all-welded Tron involve of this type of vaults is usually used on long distance oil and gas pipelines. it stem may be lengthened f...
      4m
      YouTube·Oilway Engineering
    • Fully Welded Ball Valve: The Definitive Guide - KAMROO's
      Oct 14, 2024 — What is a Fully Welded Ball Valve? Fully welded ball valves have a completely welded body, which means they don't require bolts or...
      www.kamroo.com
    • Bare Stem Ball Valve
      A bare stem ball valve is a ball valve with an ISO 5211 top flange that connects to a pneumatic or electric actuator. They have a ...
      Zhejiang Relia Valve
    • Welded Body Trunnion Mounted Ball Valve Manufacturer | WarrenValve
      The valves are standard with: * Double block and bleed * Emergency sealant injection fittings * NACE and API 607 fire-safe * Three...
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    • Virgo WL Series Welded Body Trunnion Ball Valve
      The Virgo WL Series Welded Body Trunnion Ball Valve eliminates body flanges reducing potential leak paths and increasing resistanc...
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    Videos
    Fully Welded / Seal Welded Floating Ball Valve Breakdown ...
    YouTube · Everything Valves
    Sep 19, 2020
    YouTube · Everything Valves
    6:36
    A fully welded floating ball valve is disassembled by machining the weld, unthreading the adapter, and removing internal components.
    Everything Valves
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    Sep 19, 2020

    Fully Welded / Seal Welded Floating Ball Valve Breakdown ...

    YouTube·Everything Valves·Sep 19, 2020
    YouTube
    In this video
    • 00:31
      Valve overview
    • 01:29
      Disassembling the valve
    • 01:48
      Removing the adapter
    • 02:30
      Removing the seat
    • 02:51
      Removing the ball
    • 03:34
      Removal of the stem
    • 05:28
      Components of a fully welded ball valve
    • 06:23
      Conclusion
    All welded Trunnion Ball Valve
    YouTube · Oilway Engineering
    Feb 25, 2017
    YouTube · Oilway Engineering
    4:58
    All-welded trunnion ball valves are used on long-distance oil and gas pipelines, with a design life of 30 to 50 years.
    Oilway Engineering
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    Feb 25, 2017

    All welded Trunnion Ball Valve

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    May 1, 2022

    Floating Ball Valves. What is the difference between each ...

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    Web results

    10 Inch Fully Welded Ball Valve Metal Seated Bare Stem


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    Keckley Style BVS6 seal welded high pressure ball valves are constructed from investment cast ASTM grade materials that are NACE MR0175 compliant.Read more
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    Bare Stem Ball Valve


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    Virgo WL Series Welded Body Trunnion Ball Valve


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    E60M FULL WELDED BALL VALVES


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    Fire safe welded ball


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