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DBB Thread And Flange Forged Steel Floating Double Ball Valve

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The CHINA J-VALVES DBB (Double Block and Bleed) Thread and Flange Forged Steel Floating Double Ball Valve is a high-performance Forged steel ball valve, specifically designed for industrial applications that require dual isolation and discharge functions. This type of valve achieves safe isolation of the pipeline system and medium discharge during maintenance or repair by integrating two independent spheres and a discharge port. Its forged steel material and floating ball design ensure the valve's high strength and excellent sealing performance, and it is widely used in industries such as petroleum, natural gas, chemical engineering, and pharmaceuticals.
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DBB Thread And Flange Forged Steel Floating Double Ball Valve

Structural Features

  • Dual Isolation Function: The valve is internally designed with two independent sealing balls, enabling dual isolation to ensure no medium leakage during maintenance or overhaul.

  • Bleed Function: Equipped with one bleed port, which can safely discharge residual media in the pipeline after isolation, preventing media accumulation and pressure buildup.

  • Floating Ball Design: The ball can float freely under the pressure of the medium, fitting tightly with the valve seat to form an excellent sealing effect, and also has an automatic pressure relief function.

  • Fire Safety Design: Complies with API 607 standards. Even in case of fire, the valve can still maintain sealing performance to prevent safety accidents caused by medium leakage.

  • Anti-Static Device: Built-in anti-static device effectively prevents static accumulation, reducing the risk of fire and explosion.

  • Multiple Connection Methods: Offers threaded connection (NPT) and flange connection (RF), conforming to ASME B16.5 standard, ensuring installation reliability and compatibility.

  • Compact Design: Three-piece structure reduces installation space and weight, while lowering installation costs.

Technical Parameters

  • Size Range: 1/2″ to 12″ (DN15 to DN300)

  • Pressure Range: ANSI Class 150 to Class 2500 (PN16 to PN420)

  • Temperature Range: -46℃ to +240℃

  • Material Options:

    • Valve body: A105, A182 F304 (L), A182 F316 (L), A182 F51, etc.

    • Ball: A105, A182 F304 (L), A182 F316 (L), A182 F51, etc.

    • Valve seat: PTFE, PEEK, NYLON, PPL, etc.

  • Connection Methods: Threaded connection (NPT), flange connection (RF)

  • Operation Modes: Various actuators available, including manual, electric, and pneumatic

  • Design Standards: API 6D, ASME B16.34, DIN 3357, GB/T 12237

  • Testing Standards: API 598, EN 12266

Application Scenarios

  • Oil and Gas Industry: Used in exploration, gathering, processing, and transportation systems of oil and gas fields to realize isolation, control, and discharge of oil and gas.

  • Chemical Industry: Suitable for transportation and reaction systems of various chemical media, preventing medium leakage and ensuring production safety.

  • Pharmaceutical Industry: Applied in pipeline systems during pharmaceutical production to ensure medium isolation and cleanliness in the drug manufacturing process.

  • Food and Beverage Industry: Meets food-grade requirements, used in pipeline systems for food and beverage production to ensure hygiene and safety.

  • Urban Gas Industry: Used in pressure regulating stations, gas storage stations, and gas transmission pipelines of urban gas networks to ensure safe supply and stable transportation of gas.

Advantages and Value

  • High Reliability: Dual isolation and bleed functions ensure stable operation of the valve under various working conditions, reducing maintenance frequency and downtime.

  • High Safety: Fire-resistant and anti-static design, along with low-leakage emission characteristics, effectively reduce safety risks such as fire, explosion, and leakage.

  • Easy Installation and Maintenance: Multiple connection methods simplify the installation process, and the compact structure of the valve facilitates maintenance and overhaul.

  • Wide Application Range: Multiple material options and a wide range of pressure and temperature ranges enable it to adapt to various complex working conditions and medium characteristics.


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