• Phone +86 18061659285
  • email slvcnvalve@slv-cn.com
    • English
    English Chinese Simplified Chinese Traditional French German Portuguese Spanish Russian Japanese Korean Arabic Irish Greek Turkish Italian Danish Romanian Indonesian Czech Afrikaans Swedish Polish Basque Catalan Esperanto Hindi Lao Albanian Amharic Armenian Azerbaijani Belarusian Bengali Bosnian Bulgarian Cebuano Chichewa Corsican Croatian Dutch Estonian Filipino Finnish Frisian Galician Georgian Gujarati Haitian Hausa Hawaiian Hebrew Hmong Hungarian Icelandic Igbo Javanese Kannada Kazakh Khmer Kurdish Kyrgyz Latin Latvian Lithuanian Luxembou.. Macedonian Malagasy Malay Malayalam Maltese Maori Marathi Mongolian Burmese Nepali Norwegian Pashto Persian Punjabi Serbian Sesotho Sinhala Slovak Slovenian Somali Samoan Scots Gaelic Shona Sindhi Sundanese Swahili Tajik Tamil Telugu Thai Ukrainian Urdu Uzbek Vietnamese Welsh Xhosa Yiddish Yoruba Zulu Kinyarwanda Tatar Oriya Turkmen Uyghur
    CONTACT
    Leave Your Message
    Products Categories
    Twin Ball DBB Trunnion ‑Mounted Ball Valve with Worm Gear.jpg

    Twin Ball DBB Trunnion ‑Mounted Ball Valve with Worm Gear

    ● Leak-Free Safety: Twin Ball DBB with full-seal design prevents leaks, minimizing risk and downtime.

    ● Effortless Operation: Worm gear reduces torque, enabling single-person control even for large high-pressure valves.

    ● High-Pressure Durability: Heavy-duty body and trunnion support withstand Class 1500 pressures and media impact.

    ● Versatile Functionality: Independent twin balls act as dual isolation or emergency shut-off, replacing multiple valves.

    ● Long Service Life: Premium materials and precision sealing extend valve life by 30%+, cutting maintenance and replacement costs.

      Contact us

      Product Parameters

      Size

      1"–36" (DN25–DN900, larger sizes on request)

      Pressure Rating

      Class300 / 600 / 900 / 1500 / 2500

      Operating Temperature

      –45°C to +250°C (depends on body and seat materials)

      Ball Type

      Trunnion-Mounted Twin Ball

      Body Construction

      1–3 Piece Integrated

      Body Sealing

      Double Block & Bleed (DBB)

      End Connection

      Flanged (RF / RTJ)

      Operation

      Dual Manual Handles with Worm Gear; Pneumatic & Electric Actuation optional

      Mounting:

      ISO 5211 Direct Mounting

      Body Material

      Forged Steel (WCB, 1.0619 / ASTM A182 F316 / F316L); Duplex & Super Duplex optional

      Seat Materials

      PEEK, PCTFE (KEL-F), Devlon V, Metal Seat

      Design Standards

      Designed in accordance with API 6D, BS 5351, ASME B16.34

      Fire-Safe Design

      Designed in accordance with API 607 / API 6FA

      Enhanced Safety

      Anti-Static, Anti-Blowout Stem, Fire-Safe Design

      Brand

      SLVCN
      Key Features
      Product Description
      Parts List

      Key Features

      Twin Ball DBB Design

      Dual trunnion-mounted balls with central bleed provide double block-and-bleed isolation, safe pressure release, and leakage monitoring for high-risk media.

      Enhanced Safety Features

      Engineered with fire-safe, anti-static, and anti-blowout stem design, ensuring reliable operation under high-pressure and hazardous conditions.

      Heavy-Duty Body & Support

      Forged steel body with robust trunnion support handles high-pressure, high-flow applications, delivering long-term durability and stable performance.

      Versatile Control & Easy Operation

      Twin balls can be operated independently or synchronously, supporting dual-line flow, merging, or emergency shut-off, while worm-gear drive reduces torque for easier manual control.

      Product Details

      SLVCN Twin Ball DBB TrunnionMounted Ball Valve with Worm Gear delivers reliable double block-and-bleed isolation for high-pressure pipelines. Featuring a heavy-duty forged steel body, trunnion-mounted twin balls, and a worm-gear handwheel, it ensures leak-free safety, effortless single-person operation, and long-term durability. Engineered with fire-safe, anti-static, and anti-blowout stem design, this high-performance valve supports dual-line flow, merging, or emergency shut-off, making it ideal for oil & gas, chemical, power, and industrial applications.

      Twin Ball DBB Trunnion

      Parts List

      Parts List
      1 Right Body 8 Gasket 15 Seat Retainer 22 Key 29 Packing 36 Stem Bearing
      2 Nut 9 "O"-Ring 16 Spring 23 Bolt 30 "O"-Ring 37 "O"-Ring
      3 Stud 10 Spring 17 Packing 24 Pin 31 Thrust Washer 38 Gasket
      4 "O"-Ring 11 Seat Retainer 18 "O"-Ring 25 Connection Plate 32 Stem Bearing 39 Lower Cover
      5 "O"-Ring 12 Seat 19 Thrust Washer 26 Nut 33 Thrust Washer 40 Bolt
      6 Thrust Washer 13 Ball 20 "O"-Ring 27 Bolt 34 Stem 41 Drain Valve
      7 Packing 14 Seat 21 Worm-Gear 28 Packing Box 35 Body    

      Why Choose Us

      advantage-1-1

      Decades of Expertise

      30+ years specializing in DBB, trunnion-mounted, forged & fully welded valves for high-temperature, high-pressure, and cryogenic service, trusted by projects worldwide.
      advantage-2
      advantage-1-1

      Tailored Solutions

      Custom-designed valves based on process conditions and project specifications, ensuring reliable performance under demanding operating conditions.
      advantage-2
      advantage-1-1

      Rigorous Quality Control

      ISO 9001-managed design, manufacturing, and testing in accordance with API 6D, ASME B16.34, and fire-safe standards.
      advantage-2
      advantage-1-1

      Proven Reliability

      Every valve is fully tested and inspected, delivering zero-leakage, project-ready valves you can trust.
      advantage-2

      How We Ensure Quality & Reliability?

      Quality is built into every stage - from raw material to final testing.

      Material Verification
      01

      Material Verification
      Dimensional Inspection
      02

      Dimensional Inspection
      Ultrasonic Flaw Detector
      03

      Ultrasonic Flaw Detection
      Hydrostatic Pressure Testing
      04

      Hydrostatic Pressure Testing
      CNC Machining Centers
      05

      CNC Machining Centers
      Fully Automated Welding Equipment-new
      06

      Fully Automated Welding Equipment
      Cryogenic Testing Area
      07

      Cryogenic Testing Area
      Pressure Testing Equipment
      08

      Pressure Testing Equipment

      Certificate Display

      SLVCN operates under an ISO 9001 quality management system. Products are supplied with CE conformity, Mill Test Certificates (MTC), and Certificates of Origin as required.

      Valves are designed, manufactured, and tested in accordance with API 6D, ASME B16.34, API 607, and ISO 10497 fire-safe standards, ensuring reliable performance in high-pressure and extreme service conditions.

      CE-New

      CE Certificate

      ISO9001-New(1)

      ISO9001 Certificate

      certificate 2

      Certificate for Credit for Quality Service

      certificate 3

      Certificate of Observing Contract and Keeping Promise

      certificate-New

      Trademark Certificate

      0102030405

      Applications

      Typical Media: Natural Gas, Crude Oil, Steam, Water, Chemical Fluids.

      Oil & Gas

      Oil & Gas

      Used at manifolds, metering skids, and high-pressure pipelines, the Twin Ball DBB Valve provides secure double isolation and leak monitoring.
      Chemical & Petrochemical

      Chemical & Petrochemical

      Ideal for pipelines handling hazardous or corrosive media, the DBB design ensures safe isolation and allows leakage verification.
      Power Generation

      Power Generation

      Applied in high-pressure steam and process lines, the valve delivers reliable isolation and controlled pressure release.
      Offshore & Subsea

      Offshore & Subsea

      For subsea and offshore pipelines, the valve supports dual isolation and pressure bleed monitoring, minimizing leak risks.
      Aerospace & Military

      Aerospace & Military

      Designed for high-pressure aerospace and military systems, it provides compact, secure isolation and leak-free performance.
      Water Treatment & Supply

      Water Treatment & Supply

      Used in municipal and industrial pipelines, the valve enables safe dual-line isolation and reliable maintenance.

      Make an free consultant

      Your Name*

      Phone Number

      Country

      Remarks*